Tecumseh ECV105 Technician's Handbook
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Tecumseh ECV105 Technician's Handbook

Tecumseh ECV105 Technician's Handbook

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TECUMSEH
T E C H N I C I A N ' S
H A N D B O O K
This manual covers engine models:
ECV100 - 120, H22 - 80, HH40 - 70, HHM80, HM70 - 100,
HMSK70 - 110, HMXL70, HS40 - 50, HSK30 - 70, HSSK40 - 50,
HT30 - 35, HXL35, LAV30 - 50, LEV80 - 120, TNT100 - 120,
TVM125 - 220, TVXL170 - 220, TVS75 - 120, TVXL105 - 115,
V40 - 80, VH40 - 70, V60 - 70, VM70 - 100
Model numbers are located on the engine shroud.
3
11
TO
HP
4-CYCLE
L-HEAD
ENGINES

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Questions and answers

Peter Saffery
March 10, 2025

It is an old snow blower. There is an l shaped lever going through a metal holder to control the Choke. This is attached to the carb with two bolts

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2 comments:
Peter Saffery
March 10, 2025

L shaped lever. I need the metal box holding this lever that attaches to the carb. Perhaps they come together in a kit. The holes are worn.

0
Mr. Anderson
May 14, 2025

The L-shaped lever on the Tecumseh ECV105 snow blower controls the choke by opening and closing the choke plate. This regulates the air-fuel mixture for starting the engine, especially in cold conditions. When the choke is closed, it restricts airflow to create a richer fuel mixture for easier starting.

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Summary of Contents for Tecumseh ECV105

  • Page 1 TECUMSEH T E C H N I C I A N ' S H A N D B O O K This manual covers engine models: ECV100 - 120, H22 - 80, HH40 - 70, HHM80, HM70 - 100, HMSK70 - 110, HMXL70, HS40 - 50, HSK30 - 70, HSSK40 - 50,...

  • Page 2: Table Of Contents

    SERIES 6 CARBURETORS 4-CYCLE ......................12 SERIES 8 ............................... 12 SERIES 9 ............................... 12 SERIES 10 (EMISSION) ..........................12 NON-TECUMSEH CARBURETORS -- DELLORTO CARBURETOR ............12 ENGINE TROUBLESHOOTING CHART ....................... 13 CARBURETION TROUBLESHOOTING CHART ..................14 TESTING ............................... 15 SERVICE ............................... 15 CARBURETOR PRE-SETS AND ADJUSTMENTS ..................
  • Page 3 BRAKE BRACKET REPLACEMENT ......................62 CHAPTER 8 IGNITION ..........................63 GENERAL INFORMATION ..........................63 OPERATION ..............................63 SOLID STATE IGNITION SYSTEM (CDI) ..................... 63 MAGNETO IGNITION SYSTEM (POINTS) ....................63 IDENTIFICATION OF TECUMSEH IGNITION SYSTEMS ................64 COMPONENTS ............................. 64 IGNITION TROUBLESHOOTING ........................66...
  • Page 4 TESTING PROCEDURE ..........................67 SERVICE ............................... 68 SPARK PLUG SERVICE ..........................68 CONDITIONS CAUSING FREQUENT SPARK PLUG FOULING ..............68 IGNITION TIMING PROCEDURE ......................... 68 SERVICE TIPS .............................. 71 CHAPTER 9 INTERNAL ENGINE AND CYLINDER ..................72 GENERAL INFORMATION ..........................72 OPERATION ..............................

  • Page 5: Chapter 1 General Information

    CHAPTER 1 GENERAL INFORMATION ENGINE IDENTIFICATION COVER BEZEL Tecumseh engine model, specification, and serial numbers or (date of manufacture, DOM) are stamped into the blower housing or located on a decal on the engine in locations as illustrated (diag. 1 & 2).

  • Page 6: Short Blocks

    OTHERS. FOLLOW ALL INSTRUCTIONS. FUEL Tecumseh strongly recommends the use of fresh clean unleaded regular gasoline in all engines. Unleaded gasoline burns cleaner, extends engine life and promotes better starting by reducing build-up of combustion chamber deposits. REFORMULATED AND OXYGENATED FUELS Reformulated fuels containing no more than 10% Ethanol, 15% MTBE, 15% ETBE or premium gasoline can be used if unleaded regular gasoline is not available.

  • Page 7: Engine Oil

    ENGINE OIL Use a clean, high quality detergent oil. Be sure original container is marked: A.P.I. service SF thru SJ. The use of multigrade oil may increase oil consumption under high temperature, high load applications. NOTE: DO NOT USE SAE10W40 OIL. For summer (above 32°F, 0 C) use SAE 30 oil part # 730225 (1 quart, .946 liter container) in high temperature, high load applications.

  • Page 8: Storage

    Fuel stabilizer (such as Tecumseh's Part No. 730245) is added to the fuel tank or storage container. Always follow the mix ratio found on the stabilizer container. Run the engine at least 10 minutes after adding the stabilizer to allow it to reach the carburetor.

  • Page 9: Chapter 2 Air Cleaners

    Dirt allowed into the engine will quickly wear the internal components and shorten the life of the engine. Tecumseh engines use either a polyurethane or a paper- COVER type air filter system. A polyurethane pre-cleaner or a flocked screen may be used in conjunction with the main filter.

  • Page 10: Service

    The paper filter element should be replaced at least once a year or more frequently if operated in dusty or dirty conditions. NOTE: NEVER RUN THE ENGINE WITHOUT THE COMPLETE AIR CLEANER ASSEMBLY INSTALLED ON THE ENGINE. ALWAYS REPLACE THE FILTER ELEMENT WITH THE PROPER TECUMSEH ORIGINAL REPLACEMENT PART.

  • Page 11: Chapter 3 Carburetors And Fuel Systems

    CHAPTER 3 CARBURETORS AND FUEL SYSTEMS GENERAL INFORMATION Tecumseh uses two basic types of carburetors, float and diaphragm type carburetors. Float type carburetors use a hollow float to maintain the operating level of fuel in the carburetor. Diaphragm type carburetors use a rubber-like diaphragm.

  • Page 12: Operation

    OPERATION In the “CHOKE” or “START” position, the choke shutter is closed and the only air entering the engine enters through openings around the shutter. As the engine starts to rotate, downward piston travel creates a low air pressure area (or vacuum) above the piston.

  • Page 13: Impulse Fuel Pumps

    CARBURETORS This type of carburetor uses a rubber-like diaphragm which is exposed to intake manifold pressure on one side and to atmospheric pressure on the other. Tecumseh diaphragm CHECK BALL carburetors use the diaphragm as a metering device. As the intake manifold pressure decreases due to downward...

  • Page 14: Components

    COMPONENTS Loosen screw until it just clears CHOKE SHAFT AND LEVER Check shaft for binding. Position throttle lever, then turn screw in 1 IDLE SPEED ADJUSTMENT SCREW shutter opening towards inlet fitting turn. CHOKE SHUTTER side or air horn. THROTTLE SHAFT AND LEVER MAIN NOZZLE Blow air through passage.

  • Page 15: Carburetor Identification

    CARBURETOR IDENTIFICATION Tecumseh has a variety of carburetors. To help identify these carburetors here are some simple procedures to follow. DUAL SYSTEM CARBURETORS The easiest way to identify the dual system carburetor is by the presence of a large primer bulb located on the side of the carburetor.

  • Page 16: Series 6 Carburetors 4-Cycle

    This carburetor also has a serviceable main nozzle emulsion tube and a stepped primer bulb to assist in starting. (diag. 20) NON-TECUMSEH CARBURETORS DELLORTO CARBURETOR The Dellorto carburetor is similar to the dual system carburetor. It has no adjustments and has a primer assist start.

  • Page 17: Engine Troubleshooting Chart

    ENGINE TROUBLESHOOTING Engine Will Not Start Check For Spark Check If Spark Plug Is Wet or Dry Defective Spark Plug Check Fuel Supply and Fuel Cap Vent Restricted Air Filter Restriction in Fuel System (filter, screen) Improper or Stale Fuel Carburetion Problem Sheared or Partially Sheared Poor Compression...

  • Page 18: Carburetion Troubleshooting Chart

    CARBURETION TROUBLESHOOTING START IDLE ACCELERATE HIGH SPEED Will Idles Hunts - Over Rich Run at Hunts at Runs with Engine Fuel Leak Idles with Will Not AIR SYSTEM Fast - High Hard Will Not Erratic Accelera- High Needle Over- Needle Acceler- Engine PROBLEMS...

  • Page 19: Testing

    TESTING 1. After repeated efforts to start the engine using the procedure listed in the operator’s manual fail, check for spark by removing the high tension lead and the spark plug. Install a commercially available spark plug tester and check for spark.

  • Page 20: Final Adjustments (Non-Emission Engines)

    PRE-SETS AND ADJUSTMENTS Tecumseh Carburetors Engine Model Main Pre-set Idle Pre-set (TECUMSEH AND WALBRO All models with float-type CARBURETORS) 1-1/2 turn 1 turn carburetors All models with diaphragm-type 1 turn 1 turn carburetors NOTE: OVERTIGHTENING WILL DAMAGE THE TAPER Walbro Carburetors PORTION OF THE NEEDLE.

  • Page 21: Disassembly Procedure

    Remove the retainer by prying and lifting it out with a screwdriver. Do not re-use the old bulb or retainer (diag. 30). 7. Some Tecumseh float style carburetors have a damper spring which is installed as shown. (diag. 31) POINTS TOWARD...
  • Page 22 "O" ring seal on the top and bottom end of the tube. Do not remove a main nozzle that is made of brass from any Tecumseh carburetor. These are pressed in at the factory to a specific depth. When removing the nozzle, the top "O"...

  • Page 23: Diaphragm Carburetors

    (4) screws. Clean all parts with a solvent and install a new kit which consists of a coil spring, gaskets and diaphragms (diag. 37 & 38). FLOAT ADJUSTING PROCEDURE All Tecumseh carburetors with an adjustable float require NEW STYLE the correct float height to achieve the proper operation OLD STYLE and easy engine starts.

  • Page 24: Inspection

    ADJUSTMENT SCREW Examine the tapered surface of the high speed mixture needle. If the tapered surface is damaged or shows wear, replace the needle (non-emissioned). Some Tecumseh carburetors use serviceable jet main nozzles. These are identified as being non-metallic. IDLE FUEL...

  • Page 25: Assembly

    If binding occurs, correct by loosening screws and repositioning throttle plate. Always use a new screw(s) when reinstalling the throttle shutter (Tecumseh screws are treated with dry-type adhesive to secure them in place). NOTE: NEVER REUSE OLD SCREWS. Choke Shaft and Plate...
  • Page 26 High and Low Speed Adjusting Screw, Main Nozzle When reassembling, position the coil spring on the adjusting "O" RING screws, followed by the small brass washer and the “O” RETAINER NUT BRASS WASHER ring seal. Turn the high speed adjustment screw in approximately one turn into the bowl retainer nut to make SPRING an assembly (diag.
  • Page 27 4. Install the hinge pin from the opposite hinge leg. The bowl gasket must be positioned over the end of the spring (diag. 51). GASKET GOES 5. Set the proper float height. See “Float Adjusting OVER SPRING Procedure” in this chapter. CHOKE END OF Diaphragm Assembly CARBURETOR...

  • Page 28: Standard Service Carburetors

    See “Pre-sets and Adjustments” in this chapter. STANDARD SERVICE CARBURETORS Tecumseh supplies some replacement carburetors on which parts from the old carburetors can be reused or new parts added. This Standard Service Carburetor helps to reduce dealer inventories. Standard Service Carburetors are built in both float and diaphragm versions.

  • Page 29: Throttle Lever

    Throttle Lever Remove the throttle lever and spring and file off the peened end of the throttle shaft until the lever can be removed. Install the throttle spring and lever on the new carburetor with the self-tapping screw furnished. If dust seals are furnished, install them under the return spring.

  • Page 30: Chapter 4 Governors And Linkage

    This chapter includes governor assembly and linkage illustrations to aid in governor or speed control assembly. Tecumseh 4 cycle engines are equipped with mechanical type governors. The governor’s function is to maintain a constant R.P.M. setting when engine loads are added or taken away. Mechanical type governors are driven off the engine’s camshaft gear.

  • Page 31: Engine Overspeeding

    ENGINE OVERSPEEDING 1. If the engine runs wide open (faster than normal), shut the engine off immediately. 2. Check the condition of the external governor shaft, linkage, governor spring, and speed control assembly for breakage, stretching or binding. Correct or replace binding or damaged parts. 3.

  • Page 32: Governor Gear And Shaft Service

    GOVERNOR GEAR AND SHAFT SERVICE After the cylinder cover is removed from the engine, the governor spool, gear, or governor shaft can be removed. On older style governor assemblies, the retaining ring must be removed to allow the spool or gear to slide off the shaft. Newer style governor shafts (3 - 6.75 model engines) use an upset to hold the governor spool on.

  • Page 33: Speed Controls And Linkage

    SPEED CONTROLS AND LINKAGE Many different types of speed controls and linkage are used for O.E.M. applications. Linkage attachment points are best recorded or marked prior to disassembly. This assures the correct placement during reassembly. On vertical shaft engines the solid link is always connected from the outermost hole in the governor lever to the throttle in the carburetor. The link with the governor spring attached is connected between the control lever and the lower hole in the governor lever.
  • Page 34 ADJUSTING RPM ON MEDIUM FRAME GOVERNED IDLE SPEED SCREW VERTICAL SPEED CONTROL HIGH SPEED GAP OF ADJUSTMENT TAB .040 - .070 This speed control is adjusted by aligning the slot in the (1.016 - 1.778 mm) speed control lever with the alignment hole on the mounting bracket.
  • Page 35 HORIZONTAL SHAFT ENGINES IDLE SPEED IDLE SPEED CRACK SCREW CRACK SCREW HIGH SPEED ADJUSTMENT SCREW HIGH SPEED ADJUSTMENT SCREW HORIZONTAL LIGHTWEIGHT LIGHTWEIGHT R.V. TYPE IDLE SPEED CRACK SCREW HIGH SPEED ADJUSTMENT SCREW IDLE MIXTURE MAIN SCREW MIXTURE SCREW SMALL FRAME IDLE SPEED CRACK SCREW HIGH SPEED RPM ADJUSTMENT SCREW...
  • Page 36 HORIZONTAL SHAFT ENGINES (CONTINUED) HIGH SPEED RPM ADJUSTMENT SCREW IDLE SPEED SCREW MAIN MIXTURE IDLE SPEED IDLE MIXTURE SCREW IDLE MIXTURE CRACK SCREW SCREW SCREW HMSK80-100 HORIZONTAL MEDIUM FRAME IDLE SPEED CRACK SCREW HIGH SPEED RPM ADUSTMENT SCREW MEDIUM FRAME BEND LOOP OPEN OR TO INCREASE SPEED - CLOSE LOOP CLOSED TO ATTAIN...

  • Page 37: Vertical Shaft Engines

    VERTICAL SHAFT ENGINES BEND Ó TO INCREASE SPEED HIGH SPEED ADJUSTMENT BEND TO DECREASE SPEED Ô SCREW IDLE SPEED CRACK SCREW VERTICAL SHAFT ENGINES TNT 100 VERTICAL ENGINES TVS 115 ENGINE WITH "SNAP IN" SPEED CONTROL IDLE SPEED CRACK SCREW IDLE MIXTURE SCREW TVXL 220 WITH HORIZONTAL SPEED CONTROL...
  • Page 38 GOVERNOR OVERRIDE SYSTEM FOR TVM170, 195 AND 220 ENGINES This system will be found starting on 1985 production models, and will not retrofit onto older engines. It is designed to allow the governor to regulate the low and high speeds of the engine. The high speed is adjusted at the top screw of the override lever;...

  • Page 39: Chapter 5 Rewind Starters

    CHAPTER 5 REWIND STARTERS GENERAL INFORMATION Rewind starters used on vertical shaft Tecumseh engines are top mount horizontal pull style or side mount vertical pull style. Horizontal shaft engines use side mounted starters which can be mounted to pull either vertically or horizontally.

  • Page 40: Retainer Replacement

    Standard rope lengths LEFT-HAND 54" (16.5 meters) standard stamped steel starter KNOT 61" (18.6 meters) vertical pull - horizontal engagement type 65" (20 meters) vertical pull - vertical engagement type 85" (26 meters) extended handlebar rope start (compliance) Check the old rope for the right length for the application. Some applications require longer lengths.

  • Page 41: Stylized Rewind Starter With Plastic Retainer

    CAUTION: THIS REWIND SPRING IS NOT SECURED IN A CANISTER. PULLEY BOSSES HOLD THE REWIND SPRING AND COVER, AND CAN BE EASILY DISLODGED DURING HANDLING. 4. Remove the brake spring, spring retainer, washers, and pulley assembly (diag. 7, 8, 9 & 10) NOTE: THE STARTER DOGS FACE OUT ON THE STAMPED STEEL STARTER AND THE DOGS FACE IN ON THE STYLIZED REWIND STARTER.

  • Page 42: Standard Stamped Steel And Cast Aluminum Starter (Hm, Vm)

    Assembly LEFT-HAND RETAINING WEDGE KNOT (STEEL CLIP - NEW STYLE) 1. If replacing the starter rope, see Step 8. Extreme caution should be used when working with springs. Always where appropriate safety STARTER equipment. HOUSING 2. Install a new recoil spring if necessary by pushing the new spring out of the holder into the pulley cavity while aligning the outside spring hook into the deep notch in the pulley.

  • Page 43: Vertical Pull Starter Horizontal Engagement Type

    2. Place the pulley assembly into the starter housing. 3. Install the brake spring, starter dog(s), and starter LEFT-HAND KNOT dog return spring(s). The starter dog spring(s) must hold the dog(s) in against the pulley. On Snow King HOUSING engines the starter dog posts should be lubricated with S.A.E.

  • Page 44: Vertical Pull Starter Vertical Engagement Type

    worn or damaged parts. LEFT-HAND Assembly Procedure KNOT 1. Insert the rope through the starter pulley. MOUNTING BRACKET 2. Assemble the gear, pulley, washer, and snap ring. RECEPTACLE FOR RAISED TAB MUST FIT INTO SECTION SPRING LOOP 3. Place a small amount of grease on the center shaft, place the gear and pulley into position making sure the brake spring loop is positioned over the metal tab on the bracket.

  • Page 45: Assembly Procedure

    at the outer edge against the gear sheave. ORIGINAL INSTALLATION WITH STAPLE 7. Remove the retainer pin from the strut and slowly LEFT-HAND INSTALL NEW relieve the spring tension by allowing the spring KNOT ROPE BY TYING capsule to rotate slowly under control, until completely LEFT-HAND KNOT unwound.

  • Page 46: Chapter 6 Electrical Systems

    If a cell has an open or high resistance connection, the electric starter operation will be affected. The power source used to provide the energy to turn an electric starter motor on Tecumseh engines is either 120 volt A.C.

  • Page 47: Converting Alternating Current To Direct Current

    WIRING The wires used in Tecumseh electrical systems are copper stranded with an insulated coating around the copper strands. CONDITION: All wiring must be fully insulated between connection points, securely fastened and free of foreign material (such as rust and corrosion) at the connection points.

  • Page 48: Electrical Terms

    (20 amp system requires #14 or lower gauge number). 3. The magneto circuit wiring (ground circuit) must be rated at #18 or lower gauge number. Tecumseh's standard engine wiring color codes, effective August, 1992 are as follows: Code Product Yellow Alternator A.C.

  • Page 49: Basic Checks

    BASIC CHECKS Before going into extensive checks, be sure to perform the more basic checks first, such as: 1. Battery defective or not charged. 2. Corroded or loose terminals and connections, or wrong connections. 3. Cracked insulation or broken wires. 4.

  • Page 50: Troubleshooting Electrical Starter Circuit Flow Chart

    TROUBLESHOOTING ELECTRICAL STARTER CIRCUIT FLOW CHART Starter turns at Starter will not Intermittent low rpms or turn starter operation stalls under load Is there power at the power source? Repair or Is power supplied to the replace power starter terminal? source Isolate engine Check wiring,...

  • Page 51: Troubleshooting Electrical Charging Circuit Flow Chart

    TROUBLESHOOTING ELECTRICAL CHARGING CIRCUIT FLOW CHART Identify the charging system used by model and specification number or visually check the electrical plug Consult Technician's Handbook Electrical Troubleshooting booklet for test procedure for the charging system used Test for either AC or DC voltage as directed at the proper engine Is the voltage greater than or equal to the minimum value?

  • Page 52: Testing Procedure

    Consult a Tecumseh dealer or a parts manual to identify the charging system. To make many of the tests it is necessary to run the engine and measure alternator output with a voltmeter.
  • Page 53 18 Watt A.C. Lighting Alternator Models: H35, HS & HSSK 40-50, HM & HMSK 70-80-100 CHECKING THE SYSTEM: To check the system, disconnect the plug from the rest of the lighting system. Connect a wire lead from the single pin connector coming out of the engine to one terminal of a No.
  • Page 54 TEST NO. 2 - Connect the positive probe of meter to red output lead. Connect the negative probe of meter to both A.C. terminals and black output lead. Connect the negative probe of meter to black output lead. Connect the positive probe of meter to both A.C. terminals and red output lead.
  • Page 55 NOTE: ON OLDER POINT IGNITION SYSTEMS, THE A.C. OUTPUT LEADS ARE BLACK AND RED. 3 Amp D.C. Alternator System - Rectifier Panel This 3 amp system is readily identified by the rectifier panel in the circuit. The panel includes two diodes and a fuse for overload protection.
  • Page 56 3 Amp DC Alternator System - Diode in Harness Sleeve Models: H30-35, HS40, H50-60, HH50-60, GREEN HM70-80-100, HHM80 This system has a diode included in the red wire which converts the alternating current (A.C.) to direct current. The direct current (D.C.) is used to provide a trickle charge for the battery.
  • Page 57 5 Amp Alternator System Regulator-Rectifier Under Blower Housing INSERT PROBES INTO CONNECTOR SLOTS. DO NOT REMOVE CHECKING THE SYSTEM: An open circuit D.C. voltage CONNECTOR WIRES. check cannot be made with this system. If a known good battery fails to maintain a charge, proceed to make an A.C.
  • Page 58 CHECKING THE SYSTEM: To check the system, disconnect the plug and measure the D.C. voltage at the red wire terminal (diag. 24). Measure the A.C. voltage at the yellow wire terminal. With the engine running, the minimum values should be: 3 Amp D.C.
  • Page 59 7 Amp Alternator System Regulator- Rectifier Under Engine Block Housing Models: H50-60, HH50-60, HM70-80-100, HHM80, TVM125-140-170-195-220 In this system, the regulator and rectifier are combined MAGNETO GROUND - GREEN in one solid state unit mounted under the blower housing of the engine. Various types of regulator-rectifiers have been used on different applications.

  • Page 60: Voltage Regulations

    With the engine running, minimum values should read: 2500 R.P.M. - 16.0 Volts A.C. 3000 R.P.M. - 19.0 Volts A.C. A.C. OUTPUT 3600 R.P.M. - 24.0 Volts A.C. A.C. YELLOW If the minimum readings are noted, the alternator is okay; the regulator-rectifier is defective.

  • Page 61: Service

    SERVICE This section covers the service procedures for the 12 and 120 volt electric starters. For diagnosis of the starting circuit see “Electrical Starter Troubleshooting” in this chapter. Illustrations may not be identical in configuration to the starter being serviced, but procedures and tests apply unless otherwise stated. 12 VOLT OR 120 VOLT ELECTRIC STARTERS WITH EXPOSED SHAFT 1.

  • Page 62: Inspection

    INSPECTION AND REPAIR FIELD COIL FIELD COIL CONNECTORS 1. The pinion gear parts should be checked for damage CONNECTORS or wear. If the gear does not engage or slips, it should be washed in solvent ( rubber parts cleaned in soap and water) to remove dirt and grease, and dried before reassembly.

  • Page 63: Chapter 7 Flywheel Brake Systems

    CHAPTER 7 FLYWHEEL BRAKE SYSTEMS GENERAL INFORMATION Tecumseh’s brake systems provide two methods of meeting compliance standards which has become a federal law as of June 30, 1982. There are two additional methods used by equipment manufacturers that also meet compliance standards and they are as follows: 1.

  • Page 64: Inside Edge System

    OPERATION (CONTINUED) INSIDE EDGE SYSTEM In the stop position the brake pad is applied to the inside edge of the flywheel, at the same time the ignition system is grounded (diag. 3). In order to restart the engine, the brake control must be applied. This action pulls the brake pad away from the inside edge of the flywheel and opens the ignition kill switch.

  • Page 65: Service

    SERVICE If the brake system fails to kill the ignition and stop the blade within 3 seconds the following service procedures should be followed. FLYWHEEL REMOVAL NOTE: BEFORE THE FLYWHEEL IS REMOVED OR REPLACED, THE BRAKE PRESSURE ON THE FLYWHEEL MUST BE RELIEVED AS OUTLINED BELOW UNDER "BRAKE LEVER AND PAD".

  • Page 66: Starter Interlock Switch

    STARTER INTERLOCK SWITCH The engine / blade control must close the interlock switch before the starter can be engaged. To check the interlock switch, use an ohmmeter or continuity light to perform a continuity check. Continuity should exist between the two terminals when the interlock switch button is completely depressed.

  • Page 67: Chapter 8 Ignition

    The Tecumseh magneto ignition consists of a stator assembly made of laminations, a coil, contact points, condenser, a permanent magnet mounted in the flywheel, high tension lead, and a spark plug. The coil is sealed by epoxy filler, and the points and condenser are sealed from dirt and moisture by a crankshaft seal and cover gasket.

  • Page 68: Identification Of Tecumseh Ignition Systems

    IDENTIFICATION OF TECUMSEH IGNITION SYSTEMS INTERNAL IGNITION EXTERNAL IGNITION SOLID STATE IGNITION (CDI) COMPONENTS OF A TECUMSEH MAGNETO IGNITION SYSTEM (DIAG. 7) C. CONDENSER A. FLYWHEEL WITH A. Flywheel with magnets MAGNETS B. Coil B. COIL C. Condenser G. STATOR PLATE D.
  • Page 69 The condenser acts as an electrical shock absorber to prevent arcing between the contact points as they open. Arcing will lower the voltage at the spark plug, as well as burn and pit the contact points. The condenser is a replaceable item (diag.

  • Page 70: Ignition Troubleshooting

    IGNITION TROUBLESHOOTING Engine runs Engine Will erratically or shuts Not Start off, restarts Check for spark Spark No Spark Replace spark plug Check flywheel for damaged or sheared key Isolate engine and repeat test Spark Set proper air gap on No Spark external coil Engine problem, check...

  • Page 71: Testing Procedure

    8. Check the operation of the coil using an approved tester. Follow the instructions furnished with the test unit or booklets offered by the Tecumseh Products Co. Engine and Transmission Group Service Division. If the coil or lamination assembly is defective, replace as necessary.

  • Page 72: Service

    SERVICE To remove ignition components from the engine, see Chapter 9 under "Disassembly". SPARK PLUG SERVICE Spark plugs should be removed, cleaned, and adjusted periodically. Check the air gap with a spark plug gap gauge and adjust accordingly. Set the spark plug gap at .030" (.762 mm) (diag.
  • Page 73 Begin the procedure by replacing the points if necessary. CRANKSHAFT IGNITION To do this remove the nut that secure the movable portion of the breaker points. Remove the screw from the stationary portion of the breaker points and the worn breaker point assembly.
  • Page 74 When ordering an external coil for replacement from Tecumseh Products, a solid state module will be received as a replacement. The new module will be supplied with the proper flywheel key (diag. 28).

  • Page 75: Service Tips

    Clean points with lint free paper after setting gap. Reinstall the point terminal nut and tighten after removing leads, before timing procedure. Remember to correctly TIME a Tecumseh engine, even when just changing points on a magneto system. Remember to use correct air gap gauge.

  • Page 76: Chapter 9 Internal Engine And Cylinder

    Chapter 4. All Tecumseh engines covered in this manual are four cycle engines with the valves in the engine block. The crankshaft position is designated as either horizontal or vertical as the engine rests on its base. The engines identified by decals or model as XL (Extra Life) or XL/C (Extra Life / Commercial ) are made using aluminum alloy diecast around a cast iron cylinder liner.

  • Page 77: Lubrication Systems

    (diag. 6). MAIN BEARING OIL CRANKSHAFT GROOVE PASSAGE On all Tecumseh vertical shaft 4-cycle engines, the oil is sprayed out under pressure through a small hole between PLUG CRANKSHAFT the top camshaft and crankshaft bearing to lubricate the OIL PASSAGE piston, connecting rod, and other internal parts (diag.

  • Page 78: Components

    COMPONENTS The cylinder block houses the piston, valves and along with the cylinder cover all the internal components. The block is a one piece diecast aluminum alloy or cast iron cylinder casting (diag. 10). The piston transmits the force of the burning and expanding gases through the connecting rod to the crankshaft. The piston rings provide the seal between the cylinder wall and the piston.

  • Page 79: Engine Operation Problems

    ENGINE OPERATION PROBLEMS ENGINE KNOCKS OVERHEATS SURGES OR RUNS UNEVENLY Associated equipment loose or Fuel cap vent obstructed Excessive engine loading improperly adjusted Check for excessive carbon in Dirty carburetor or air filter Low oil level or wrong viscosity oil combustion chamber Loose flywheel, examine key, Cooling air flow, obstructed or...
  • Page 80 ENGINE OPERATION PROBLEMS BREATHER PASSING OIL ENGINE MISFIRES ENGINE VIBRATES EXCESSIVELY Oil level too high Wrong or fouled spark plug Bent crankshaft Excessive RPM or improper governor Carburetor improperly adjusted Attached equipment out of balance setting Damaged gaskets, seals or "O" rings Valves sticking or not seating properly Loose mounting bolts Breather damaged, dirty or improperly...

  • Page 81: Testing

    TESTING ENGINE KNOCKS 1. Check the blade hub, blade adapter, or crankshaft coupler for loose fit, loose bolts, or crankshaft key damage. Remove, inspect, replace if necessary. Reinstall and re-torque the bolts to the proper torque. 2. Check the flywheel key and the flywheel and crankshaft keyway for wear or partial shearing. Replace if any damage is evident.

  • Page 82: Engine Vibrates Excessively

    ENGINE VIBRATES EXCESSIVELY 1. Check the engine crankshaft on the PTO end for bends using a straight edge, square or a dial indicator. Blades or adapters must be removed. Any deflection will cause a vibration problem. 2. Check the engine mounting bolts, make sure they are tight. 3.

  • Page 83: Service

    5. Check the engine valve lash. Reset the valves at the proper lash. 6. Check the valves for proper seating and valve guide lash. Recondition the valves and seats. Replace the valves if necessary. 7. Check the ignition timing. Check the flywheel key for partial shearing. PRESS IN AND LIFT SERVICE COVER BEZEL...
  • Page 84 13. Remove the cylinder cover or mounting flange using a seal protector positioned in the seal to prevent seal damage. The crankshaft must be free of rust or scale to slide the cover off the crankshaft. H30-HS50 horizontal crankshaft engines with ball bearings on the crankshaft require the oil seal and the snap ring to be removed prior to the cylinder cover removal.

  • Page 85: Cylinders

    .002 inch (.051 mm) of the desired finish size. Replace the coarse stones with finishing stones and continue honing the cylinder to the final size. Tecumseh recommends using a 390 grit hone for finishing. Clean the cylinder and crankcase with soap and water TRENCHING and dry thoroughly.

  • Page 86: Cylinder Heads

    CYLINDER HEADS Check the cylinder head for warpage by placing the head on a precision flat surface. If warped in excess of .005" (.13 mm) replace the head. Slight warpage can be corrected by placing a sheet of #400 wet /dry sandpaper on a precision flat surface and rubbing the head gasket surface in a circular pattern until the entire gasket surface shows evidence of sanding.

  • Page 87: Connecting Rods

    Use a ring expander to remove and replace the rings. Do CHAMFER not spread the rings too wide or breakage will result. 1ST COMPRESSION RING If the top compression ring has an inside chamfer, this 2ND COMPRESSION RING chamfer must face UP. The second compression ring will have either an inside chamfer or an outside notch.

  • Page 88: Crankshafts And Camshafts

    CRANKSHAFTS AND CAMSHAFTS BEVEL CHAMFER TOOTH Inspect the crankshaft visually and with a micrometer for CRANKSHAFT GEAR wear, scratching, scoring, or out of round condition. Check for bends on the P.T.O. end using a straight edge, square or a dial indicator. PUNCH MARK CAMSHAFT CAUTION: NEVER TRY TO STRAIGHTEN A...

  • Page 89: Valves

    VALVES FACE The valves should be checked for proper clearance, sealing, and wear. Valve condition is critical for proper engine performance. Valve clearance should be checked before removal from the engine block if a valve problem is suspected or when the valves or seats are recut. WRONG Valve clearance (between the valve stem and valve lifter) should be set or checked when the engine is cold.

  • Page 90: Crankcase Breathers

    "Table of Specifications" (Chapter 10) to determine the correct oversize dimension. Reamers are available through your local Tecumseh parts supplier. Consult the tool section in Chapter 11 for the correct part numbers. The upper and lower valve spring caps must be redrilled to accommodate the oversize valve stems.

  • Page 91: Cylinder Cover, Oil Seal, And Bearing Service

    Late production top mounted breathers use the rubber boot and breather tube as a push in design. Mark or note the location of the breather tube. Use a large flat blade screwdriver to pry the boot up and lift the breather assembly out.

  • Page 92: Crankshaft Bearing Service

    Oil Seal Service OIL SEAL REMOVER TOOL: POSITIONED FOR REMOVAL OF OIL SEAL NOTE: BEFORE REMOVING THE OIL SEAL, CHECK TO OIL SEAL SEE IF THE SEAL IS RAISED OR RECESSED. WHEN INSTALLING A NEW OIL SEAL, TAP IT INTO POSITION GENTLY UNTIL IT IS SEATED INTO ITS BOSS.

  • Page 93: Counterbalance Service

    POLYPROPYLENE PORTION OF FLYWHEEL Some Tecumseh engines have polypropylene fans that are replaceable. A damaged fan can be replaced by tapping on the outside portion of the fan until it separates from the iron portion of the flywheel (diag. 58).

  • Page 94: Chapter 10 Engine Specifications

    CHAPTER 10 ENGINE SPECIFICATIONS The engine specifications listed on the following pages include tolerances that are considered acceptable to achieve normal engine operation. Observed values inside the listed tolerance range are satisfactory and require no adjustments.

  • Page 95: Four Cycle Torque Specifications

    FOUR CYCLE TORQUE SPECIFICATIONS The torque specifications listed in this chart are to be used for replacing components after disassembly, not for checking an existing engine bolt torque. Checking a torque value on a new or used engine may be lower due to torque relaxation that occurs on all engines from thermal expansion and contraction.
  • Page 96 FOUR CYCLE TORQUE SPECIFICATIONS - CONTINUED The torque specifications listed in this chart are to be used for replacing components after disassembly, not for checking an existing engine bolt torque. Checking a torque value on a new or used engine may be lower due to torque relaxation that occurs on all engines from thermal expansion and contraction.

  • Page 97: Engine Specifications Standard Point Ignition

    ENGINE SPECIFICATIONS STANDARD POINT IGNITION All models have point setting of .020" (.508 mm), spark plug gap of .030" (.762 mm), valve seat angle of 46 All dimensions are in inches. & & ) ³ . T . . T . t r i &...
  • Page 98 ENGINE SPECIFICATIONS STANDARD POINT IGNITION (CONT.) All models have point setting of .020" (.508 mm), spark plug gap of .030" (.762 mm), valve seat angle of 46 All dimensions are in inches. ) ³ . T . . T . t r i &...
  • Page 99 ENGINE SPECIFICATIONS STANDARD POINT IGNITION All models have point setting of .020" (.508 mm), spark plug gap of .030" (.762 mm), valve seat angle of 46 All dimensions are in inches. ) ³ . T . . T . t r i &...
  • Page 100 ENGINE SPECIFICATIONS STANDARD POINT IGNITION (Cont.) All models have point setting of .020" (.508 mm), spark plug gap of .030" (.762 mm), valve seat angle of 46 All dimensions are in inches. ) ³ . T . . T . t r i &...

  • Page 101: Solid State And External Ignition

    SOLID STATE AND EXTERNAL IGNITION All solid state models have air gap settings of .0125" (.3175 mm), spark plug gap of .030" (.762 mm), valve seat angle of 46 All dimensions are in inches. ) ³ . T . t r i &...
  • Page 102 SOLID STATE AND EXTERNAL IGNITION All solid state models have air gap settings of .0125" (.3175 mm), spark plug gap of .030" (.762 mm), valve seat angle of 46 All dimensions are in inches. & & & i l r &...
  • Page 103 SOLID STATE AND EXTERNAL IGNITION All solid state models have air gap settings of .0125" (.3175 mm), spark plug gap of .030" (.762 mm), valve seat angle of 46 All dimensions are in inches. ) ³ . T . t r i &...
  • Page 104 SOLID STATE AND EXTERNAL IGNITION All solid state models have air gap settings of .0125" (.3175 mm), spark plug gap of .030" (.762 mm), valve seat angle of 46 All dimensions are in inches. & & ) ³ . T . t r i &...
  • Page 105 SOLID STATE AND EXTERNAL IGNITION (Cont.) All solid state models have air gap settings of .0125" (.3175 mm), spark plug gap of .030" (.762 mm), valve seat angle of 46 All dimensions are in inches. , * * & & ) ³...

  • Page 106: Chapter 11 Education Materials And Tools

    694862 light/medium frame engines. This booklet depicts all specialty tools offered by 695562 French Tecumseh which can be used on 2 and 4 cycle engines Covers the diagnosis and repair of the Tecumseh 4-cycle and Peerless units. light/medium frame engines.
  • Page 107 FLYWHEEL KNOCK-OFF TOOL OIL SEAL DRIVER No. 670272 - Oil Seal Driver. Used with all oil seal protector-drivers to drive the seal into position. No. 670103 - Knock-off tool (right hand) (7/16"). OIL SEAL PROTECTOR / INSTALLER No. 670169 - Knock-off tool (right hand) (1/2"). Consult the specification chart or measure the shaft diameter to determine the correct tool.
  • Page 108 1/32" (.794 mm) OVERSIZE VALVE GUIDE REAMER VALVE LAPPING TOOL No. 670154 Valve lapping tool. REBUSHING DRIVERS No. 670283. Used on small frame 4 cycle engines on Intake and Exhaust valve guides. Oversize diameter .2807 .2817 No. 670284. Used on medium and large frame 4 cycle engines on Intake and Exhaust.

  • Page 109: Decimal/Fraction Conversions

    DECIMAL/FRACTION CONVERSIONS .016 = 1/64 .516 = 33/64 .031 = 1/32 .531 = 17/32 .047 = 3/64 .547 = 35/64 .063 = 1/16 .563 = 9/16 .078 = 5/64 .578 = 37/64 .094 = 3/32 .594 = 19/32 .109 = 7/64 .609 = 39/64 .125 = 1/8 .625 = 5/8...
  • Page 110 SEARS CRAFTSMAN CROSS REFERENCE CHARTS Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh 143.214322 ECV100-145023A 143.224362 ECV100-145033A 143.233012 LAV30-30502K 143.201032 LAV30-30462H 143.214332 LAV35-40644J 143.224372 LAV35-40689K 143.233032 LAV30-30504K 143.201042 LAV30-30467H 143.214352 ECV100-145026A 143.224382 LAV35-40063K 143.233042 LAV30-30510K 143.203012 LAV30-30460H 143.216012 V70-125141 143.224392 LAV35-40139K 143.234022...
  • Page 111 SEARS CRAFTSMAN CROSS REFERENCE CHARTS Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh 143.243022 LAV30-30524K 143.245182 LAV50-62024 143.254082 LAV35-40812K 143.255102 LAV50-62029A 143.243042 LAV30-30527K 143.245192 ECV120-152022 143.254092 LAV35-40813K 143.255112 LAV50-62039A 143.243052 LAV30-30282K 143.246012 V60-70268H 143.254102 LAV35-40814K 143.256012 VM80-150076A 143.243062 LAV30-30533K 143.246022 VM80-150052A 143.254112...
  • Page 112 SEARS CRAFTSMAN CROSS REFERENCE CHARTS Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh 143.264432 ECV100-145099A 143.266182 VM80-150062C 143.274202 ECV100-145117A 143.274762 ECV100-145139B 143.264452 ECV100-145101A 143.266202 VM80-150058C 143.274212 ECV100-145117B 143.274772 LAV35-40924L 143.264462 ECV100-145102A 143.266212 VM80-150064C 143.274222 ECV100-145118A 143.274782 ECV100-145107B 143.264472 LAV35-40922K 143.266222 VM80-150016C 143.274232...
  • Page 113 SEARS CRAFTSMAN CROSS REFERENCE CHARTS Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh 143.276402 VM100-157014A 143.284492 ECV100-145126C 143.286162 VM80-150116E 143.294282 TVS90-43040A 143.276412 V60-70351J 143.284502 ECV100-145146D 143.286172 VM80-150016E 143.294292 TVS90-43041A 143.276422 V70-125240C 143.284512 LAV35-40997M 143.286182 VM80-150121E 143.294292 TVS90-43041A 143.276432 VM80-150062D 143.284522 LAV35-40998M 143.286192...
  • Page 114 SEARS CRAFTSMAN CROSS REFERENCE CHARTS Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh 143.296012 VM80-150080F 143.304322 ECV100-145182D 143.314402 TVS90-43068B 143.316042 VM70-127008B 143.296022 VM100-157028B 143.304332 ECV100-145183D 143.314412 TVS90-43108B 143.316052 VM80-150116G 143.296032 VM80-150126F 143.304342 TVS90-43121A 143.314422 ECV100-145172E 143.316062 VM80-150134G 143.296042 VM100-157034B 143.304352 ECV100-145137D 143.314432...
  • Page 115 SEARS CRAFTSMAN CROSS REFERENCE CHARTS Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh 143.326062 TVM195-150017H 143.334272 TVS90-43140D 143.344332 ECV100-145238F 143.354152 ECV100-145255F 143.326072 TVM195-150065H 143.334282 TVS90-43141D 143.344342 ECV100-145239F 143.354162 TVS90-43289D 143.326082 TVM195-150071H 143.334292 TVS90-43142D 143.344352 ECV100-145240F 143.354172 TVS90-43288D 143.326092 TVM195-150039H 143.334302 TVS90-43143D 143.344362...
  • Page 116 SEARS CRAFTSMAN CROSS REFERENCE CHARTS Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh 143.356202 TVM220-157089F 143.366102 TVM195-150152L 143.376042 TVM195-150164M 143.384562 ECV100-145320G 143.356212 TVM220-157090F 143.366112 TVM220-157083G 143.376052 TVM220-157115H 143.384572 TVS90-43415F 143.356222 TVM220-157091F 143.366122 TVM220-157084G 143.376062 TVM195-150151M 143.385012 ECV120-152041D 143.356232 TVM220-157093F 143.366132 TVM220-157097G 143.376092...
  • Page 117 SEARS CRAFTSMAN CROSS REFERENCE CHARTS Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh 143.394432 ECV100-145343G 143.404452 TVS105-53151G 143.414402 TVS105-53902H 143.424232 TVS90-43375H 143.394442 ECV100-145344G 143.404462 TVS105-53152G 143.414412 TVS105-53168H 143.424242 TVS90-43553H 143.394452 ECV100-145345G 143.404472 TVS120-63120F 143.414422 TVS120-63115G 143.424252 TVS90-43528H 143.394462 ECV100-145346G 143.404482 TVS120-63903F 143.414442...
  • Page 118 SEARS CRAFTSMAN CROSS REFERENCE CHARTS Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh 143.434132 TVS115-61901 143.598012 HH80-110092C 143.612022 HH120-120087C 143.622082 HH120-120087D 143.434142 TVS90-43497J 143.601022 H30-35223H 143.614042 H35-45326J 143.622092 HH120-120055D 143.434152 TVS115-56906A 143.601032 H30-35224H 143.614062 H35-45314H 143.622102 HH120-120167D 143.434162 TVS115-56001A 143.601062 H30-35248G 143.614072...
  • Page 119 SEARS CRAFTSMAN CROSS REFERENCE CHARTS Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh 143.628012 HH80-110056E 143.644072 H35-45418J 143.654062 H35-45441H 143.656252 H60-75426J 143.628022 HH80-110075E 143.644082 H35-45420G 143.654072 H35-45448K 143.656262 H70-130203C 143.629012 HH100-115176D 143.645012 HS50-67037A 143.654082 H35-45428K 143.656272 H70-130205C 143.629022 HH100-115164D 143.645022 HS50-67062A 143.654092...
  • Page 120 SEARS CRAFTSMAN CROSS REFERENCE CHARTS Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh 143.665042 HS50-67037C 143.672042 HH120-120078F 143.686052 HM80-155146E 143.706042 HM80-155189E 143.665052 HS50-67128C 143.672052 HH120-120181F 143.686062 H70-130206D 143.706052 HM80-155189E 143.665062 HS50-67132B 143.672062 HH120-120095F 143.686072 H50-65413K 143.706062 H60-75469K 143.665072 HS50-67135C 143.672072 HH120-120208F 143.686082...
  • Page 121 SEARS CRAFTSMAN CROSS REFERENCE CHARTS Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh 143.716052 HM70-132007B 143.724032 H35-45571N 143.741062 H30-35351P 143.756102 HM80-155146G 143.716062 HM70-132008B 143.724042 H35-45474N 143.741072 H30-35354P 143.756112 HM100-159014D 143.716072 HM80-155189F 143.724052 HS40-55526H 143.741082 H30-35362P 143.756122 HM80-155256G 143.716082 HM80-155190F 143.725012 HS50-67210E 143.741092...
  • Page 122 SEARS CRAFTSMAN CROSS REFERENCE CHARTS Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh 143.784092 H30-35362S 143.796152 HM80-155346L 143.826032 HM80-155433M 143.943528 TVS90-43299K 143.784102 H30-35374S 143.796162 HM100-159169H 143.826042 HM80-155454M 143.943530 TVS90-43514K 143.784102 H30-35374S 143.796172 HM100-159135H 143.826052 HM100-159135K 143.943532 TVS90-43700K 143.784112 H35-45592S 143.796182 H70-130006H 143.826062...
  • Page 123 SEARS CRAFTSMAN CROSS REFERENCE CHARTS Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh 143.945300 TVS120-63918K 143.953810 TVS100-44046G 143.963500 TVS90-43515M 143.965018 LEV115-350006A 143.945300 TVS120-63918K 143.953812 TVS100-44038G 143.963501 H35-45657W 143.965020 TVS115-61027C 143.945302 TVS120-63919K 143.953814 TVS90-46035B 143.963502 TVS90-43215M 143.965022 TVS115-61056C 143.945502 TVS120-63921K 143.953818 TVS100-44030G 143.963503...
  • Page 124 SEARS CRAFTSMAN CROSS REFERENCE CHARTS Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh 143.974014 TVS115-56094E 143.978005 HM80-155587R 143.985007 HSSK50-67374S 143.994502 LEV100-345012C 143.974016 TVS115-56095E 143.978007 HM80-155424R 143.985008 LEV115-350072C 143.994506 TVS115-57064G 143.974018 TVS115-56073E 143.978501 HMSK85-155901A 143.985010 TVS115-61085E 143.995000 LEV115-350114D 143.974020 LEV115-350044B 143.979001 HMSK90-156518C 143.985012...

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