Table of Contents
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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
ENGINES
TRANSMISSIONS
&
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Table of Contents
Troubleshooting
Related Manuals for Tecumseh ECV100 - 120
Summary of Contents for Tecumseh ECV100 - 120
- Page 1 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,...
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Page 2: Table Of Contents
SERIES 9 ..............................12 SERIES 10 (EMISSION) ..........................12 SERIES 11 ..............................12 SERIES 11 BRIDGED ..........................13 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 SERVICE ..............................27 GOVERNOR ADJUSTMENT ........................27 GOVERNOR ADJUSTMENT PROCEDURE FOR SHORT BLOCK INSTALLATIONS ....... 27 GOVERNOR GEAR AND SHAFT SERVICE ....................28 SPEED CONTROLS AND LINKAGE ......................29 CHAPTER 5 REWIND STARTERS ......................35 GENERAL INFORMATION .......................... 35 OPERATION ..............................35 COMPONENTS ............................
- Page 4 IDENTIFICATION OF TECUMSEH IGNITION SYSTEMS ................64 COMPONENTS ............................64 IGNITION TROUBLESHOOTING ........................ 66 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 ...................
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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
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 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 throttle CHOKE SHAFT AND LEVER Check shaft for binding. Position shut- lever, then turn screw in 1 turn. IDLE SPEED ADJUSTMENT SCREW ter opening towards inlet fitting side or CHOKE SHUTTER 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
SERIES 6 CARBURETORS 4-CYCLE Series 6 carburetors are used on 2 and 4-cycle engines. They have a larger venturi than the dual system carburetor and use a simple fixed idle system. Series 6 carburetors used on both vertical and horizontal applications are nonadjustable. -
Page 17: Series 11 Bridged
This extra passage improves run quality during light load engine operation (diag. 22). NON-TECUMSEH CARBURETORS DELLORTO CARBURETOR The Dellorto carburetor is similar to the dual system carburetor. -
Page 18: Carburetion Troubleshooting Chart
CARBURETION TROUBLESHOOTING START IDLE ACCELERATE HIGH SPEED AIR SYSTEM PROBLEMS Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á... -
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 1-1/2 turn 1 turn CARBURETORS) carburetors All models with diaphragm-type 1 turn 1 turn carburetors NOTE: OVERTIGHTENING WILL DAMAGE THE TAPER PORTION OF THE NEEDLE. All adjustments should be Walbro Carburetors made with the carburetor in the operating position. -
Page 21: Disassembly Procedure
Note the position of the hooks before removing the float hinge pin (diag. 31). 3. Remove the float, clip, and inlet needle. 4. Remove the inlet needle seat using the Tecumseh Use carb. tool carburetor tool #670377 as shown. Push the hook # 670377 through the hole in the center of the seat to remove it. - 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"...
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Page 23: Diaphragm Carburetors
To check the float height, hold the carburetor in an upside down position. Remove the bowl nut, float bowl, and "O" ring. Place the Tecumseh carburetor tool #670377 with flat dimensions of 11/64" (4.36 mm) across the top of the carburetor casting on the opposite side and parallel to the float hinge pin (diag. -
Page 24: Inspection
“O” ring seal if damaged (diag. 44). 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. -
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 The choke plate is inserted into the air horn of the carburetor in such a position that the flat surface of the choke is down. - Page 26 Moisten the seat with oil and insert the seat with the grooved side down and away from the inlet needle. Press the seat into the cavity using the Tecumseh carburetor tool #670377 making sure it is firmly seated (diag. 52).
- 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. 55). 5. Set the proper float height. See “Float Adjusting Procedure” in this chapter. Diaphragm Assembly The rivet head on the diaphragm must always face toward the inlet needle valve.
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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 GOVERNED ADJUSTING RPM ON MEDIUM FRAME 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 HIGH SPEED RPM IDLE SPEED CRACK SCREW 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 ADJUSTMENT SCREW MEDIUM FRAME BEND LOOP OPEN OR TO INCREASE SPEED - CLOSE LOOP CLOSED TO ATTAIN...
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Page 37: Vertical Shaft Engines
VERTICAL SHAFT ENGINES HIGH SPEED BEND Ó TO INCREASE SPEED ADJUSTMENT Ô BEND TO DECREASE SPEED SCREW IDLE SPEED CRACK SCREW VERTICAL SHAFT ENGINES TNT 100 VERTICAL ENGINES TVS 115/LEV ENGINE SPEED CONTROL IDLE SPEED CRACK SCREW IDLE MIXTURE SCREW TVXL 220 WITH HORIZONTAL SPEED CONTROL STANDARD TVM ENGINE WITHOUT GOVERNOR OVERRIDE... - 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.
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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) 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. Recoil starters are under heavy tension. Extreme caution should be used when working STARTER with these parts and always wear safety glasses, HOUSING leather gloves and a heavy, long sleeved shirt. -
Page 43: Vertical Pull Starter Horizontal Engagement Type
3. Replace the retainer cup (cam dog on snow proof starter) and retainer screw. Tighten to 65 - 75 in. lbs. LEFT-HAND Older models that use a 10 - 32 retainer screw can be KNOT replaced with a larger 12 - 28 screw (part # 590409A). HOUSING Re-drill the screw hole using a 13/64"... -
Page 44: Vertical Pull Starter Vertical Engagement Type
Assembly Procedure LEFT-HAND KNOT 1. Insert the rope through the starter pulley. 2. Assemble the gear, pulley, washer, and snap ring. 3. Place a small amount of grease on the center shaft, RECEPTACLE MOUNTING BRACKET FOR RAISED TAB MUST FIT INTO place the gear and pulley into position making sure SECTION SPRING LOOP... -
Page 45: Assembly Procedure
7. Remove the retainer pin from the strut and slowly relieve ORIGINAL INSTALLATION WITH STAPLE the spring tension by allowing the spring capsule to LEFT-HAND rotate slowly under control, until completely unwound. INSTALL NEW KNOT The spring capsule can now be removed from the gear ROPE BY TYING LEFT-HAND sheave. -
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 replace Is power supplied to the power source starter terminal? Isolate engine Check wiring, from the... -
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 the Quick Reference Service Guide test procedures on the different charging systems available. 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- FULL WAVE HALF WAVE HALF WAVE 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 in MAGNETO GROUND - GREEN one solid state unit mounted under the blower housing of the engine.
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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 magnets A. FLYWHEEL WITH 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.
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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 for... -
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 "Grey Key" is stamped on the coil to identify the proper flywheel key to be used. When ordering an external coil for replacement from Tecumseh Products, a solid state module will be received as a replacement.
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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). On all Tecumseh vertical shaft 4-cycle engines, the oil is sprayed out under pressure through a small hole between the top camshaft and crankshaft bearing to lubricate the 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
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. SERVICE DISASSEMBLY PROCEDURE The following procedures apply to most engine models. - 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.
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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 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 not spread the rings too wide or breakage will result. If the top compression ring has an inside chamfer, this 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 Inspect the crankshaft visually and with a micrometer for 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. CAUTION: NEVER TRY TO STRAIGHTEN A BENT CRANKSHAFT. -
Page 89: Valves
This vapor would produce an unsatisfactory exhaust emission and fail today's CARB and EPA emission standards. Tecumseh's position on emissionized engines is that oversized valves are not necessary. The emissionized valve with the valve stem seal should last the life of the engine. -
Page 90: Crankcase Breathers
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 NOTE: BEFORE REMOVING THE OIL SEAL, CHECK TO 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. SOME SEALS ARE NOT POSITIONED FLUSH TO THE CYLINDER COVER. -
Page 93: Counterbalance Service
(diag. 59 & 60). FLYWHEEL SERVICE 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. -
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 & i t a . n i . t f . l y s t l s t l s t l s t l . l y . l y o l r o r i . - Page 96 FOUR CYCLE TORQUE SPECIFICATIONS - CONTINUED & i t a . n i . t f f f u r e l i t n f f u r e l i t n f f u r e l i t n f f u r e l...
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Page 97: Engine Specifications Standard Point Ignition
ENGINE SPECIFICATIONS STANDARD POINT IGNITION & & c i r t c i r t c i r t c i r t c i r t . S . . S . . S . . S . . S . i ( t ) ³... - Page 98 ENGINE SPECIFICATIONS STANDARD POINT IGNITION (CONT.) c i r t c i r t c i r t c i r t c i r t . S . . S . . S . . S . . S . i ( t ) ³...
- Page 99 ENGINE SPECIFICATIONS STANDARD POINT IGNITION c i r t c i r t c i r t c i r t c i r t . S . . S . . S . . S . . S . i ( t ) ³...
- Page 100 ENGINE SPECIFICATIONS STANDARD POINT IGNITION (Cont.) c i r t c i r t c i r t c i r t c i r t . S . . S . . S . . S . . S . i ( t ) ³...
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Page 101: Solid State And External Ignition
SOLID STATE AND EXTERNAL IGNITION c i r t c i r t c i r t c i r t c i r t . S . . S . . S . . S . . S . i ( t ) ³... - Page 102 SOLID STATE AND EXTERNAL IGNITION & & & & i l r & & i l r c i r t c i r t c i r t c i r t c i r t . S . .
- Page 103 SOLID STATE AND EXTERNAL IGNITION c i r t c i r t c i r t c i r t c i r t . S . . S . . S . . S . . S . i ( t ) ³...
- Page 104 SOLID STATE AND EXTERNAL IGNITION & & c i r t c i r t c i r t c i r t c i r t . S . . S . . S . . S . . S . i ( t ) ³...
- Page 105 SOLID STATE AND EXTERNAL IGNITION (Cont.) , * * & & c i r t c i r t c i r t c i r t . S . . S . . S . . S . i ( t ) ³...
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Page 106: Chapter 11 Education Materials And Tools
Except the TC Engine and TVS840. for troubleshooting electrical systems on outdoor power 692509 equipment. Covers the diagnosis and repair of the Tecumseh 4-cycle 695285 light/medium frame engines. An in-depth look at the 800 series transaxles. Detailing 691462A... - 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.
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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 143.001000 TVM220-157285G 143.016700 LEV120-361515A 143.255012 LAV50-62027 143.006512 LEV120-361037C 143.001001 HM100-159411R 143.016702 LEV120-361517A 143.255022 LAV50-62029 143.006700 LEV120-361501A 143.001002 TVM220-157286G 143.016704 LEV120-361518A 143.255042 LAV50-62037 143.006702 LEV120-361502A 143.001101 HMSK110-159960A 143.016706 LEV120-361520A 143.255052...
- Page 111 SEARS CRAFTSMAN CROSS REFERENCE CHARTS Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh 143.274492 LAV35-40858L 143.284712 LAV35-40926M 143.314482 TVS90-43150B 143.331012 TVS75-33025D 143.274552 LAV35-40961L 143.284722 LAV35-40917M 143.314542 TVS90-43066B 143.331022 TVS75-33012D 143.274592 LAV35-40962L 143.284732 LAV35-40859M 143.314552 TVS90-43088B 143.334022 TVS90-43173D 143.274642 LAV35-40626L 143.284762 LAV35-40463M 143.314562...
- Page 112 SEARS CRAFTSMAN CROSS REFERENCE CHARTS Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh 143.345042 LAV50-62082E 143.356082 TVM220-157083F 143.374072 TVS90-43358E 143.384392 TVS90-43403F 143.346012 TVM220-157058E 143.356092 TVM220-157084F 143.374082 TVS90-43359E 143.384402 TVS105-53107F 143.346022 TVM220-157062E 143.356102 TVM170-127013E 143.374212 TVS90-43360E 143.384412 TVS105-53602F 143.346032 TVM170-127008D 143.356122 TVM195-150154K 143.374222...
- Page 113 SEARS CRAFTSMAN CROSS REFERENCE CHARTS Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh 143.394312 TVS90-43455F 143.404382 TVS105-53906G 143.414342 TVS105-53903H 143.424322 TVS105-56006 143.394322 TVS90-43456F 143.404392 TVS105-53907G 143.414362 TVS105-53911H 143.424332 TVS120-63134H 143.394332 TVS90-43457F 143.404402 TVS120-63902F 143.414372 TVS105-53169H 143.424342 TVS120-63135H 143.394342 ECV100-145334G 143.404412 TVS105-53147G 143.414382...
- Page 114 SEARS CRAFTSMAN CROSS REFERENCE CHARTS Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh 143.434302 TVS90-46018 143.626122 H70-130036A 143.666192 H60-75438K 143.686142 HM80-155171E 143.434312 TVS90-46019 143.626142 H70-130006A 143.666202 H60-75439K 143.686142 HM80-155171E 143.434332 TVS120-63918J 143.626152 H70-130070A 143.666222 H70-130200C 143.686152 HM100-159036C 143.434342 TVS100-44037E 143.626172 H70-130081A 143.666242...
- Page 115 SEARS CRAFTSMAN CROSS REFERENCE CHARTS Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh 143.707112 HS50-67195D 143.725012 HS50-67210E 143.751012 H30-35342R 143.766122 HM100-159115L 143.707122 HS40-55534G 143.726012 H60-75480M 143.751022 H30-35333R 143.766132 H70-130263K 143.707132 HS50-67200D 143.726022 HM100-159019C 143.751032 H30-35362R 143.766142 HM100-159125L 143.716012 HM70-132014B 143.726032 HM80-155228F 143.751042...
- Page 116 SEARS CRAFTSMAN CROSS REFERENCE CHARTS Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh 143.794082 HS50-67300H 143.824022 H30-35426T 143.943526 TVS90-43512K 143.945020 TVS115-61027A 143.796012 HM80-155308N 143.824042 H30-35431T 143.943528 TVS90-43299K 143.945300 TVS120-63918K 143.796022 HM80-155309N 143.826012 HM80-155445P 143.943530 TVS90-43514K 143.945300 TVS120-63918K 143.796032 HM80-155321N 143.826022 HM100-159209R 143.943532...
- Page 117 SEARS CRAFTSMAN CROSS REFERENCE CHARTS Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh 143.953808 TVS100-44037G 143.961005 HM100-159309M 143.965012 TVS115-61026C 143.974012 TVS115-56047E 143.953810 TVS100-44046G 143.961007 HM100-159294M 143.965014 TVS115-61037C 143.974014 TVS115-56094E 143.953812 TVS100-44038G 143.963001 H30-35453X 143.965016 LEV115-350004A 143.974016 TVS115-56095E 143.953814 TVS90-46035B 143.963500 TVS90-43515M 143.965018...
- Page 118 SEARS CRAFTSMAN CROSS REFERENCE CHARTS Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh Craftsman Tecumseh 143.978001 HMSK80-155478U 143.985007 HSSK50-67374S 143.994000 LEV100-340026C 143.996524 LEV120-361054B 143.978003 HMSK80-155580U 143.985008 LEV115-350072C 143.994001 H40-55703A 143.998000 TVM195-150289G 143.978005 HM80-155587R 143.985010 TVS115-61085E 143.994002 LEV100-340029C 143.998001 HM80-155658S 143.985012 LEV115-350090C 143.978007 HM80-155424R 143.994004...