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 the following models:
VH80, VH100, HH80, HH100, HH120, OH120-180
Model numbers are located on the engine shroud.
Other illustrated Tecumseh 2-Cycle Engine, 4-Cycle Engine
and Transmission manuals; booklets; and wall charts are
available through Tecumseh.
For complete listing write or call
8 TO 18 HP
CAST IRON
FOUR CYCLE
ENGINES
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Table of Contents
Troubleshooting
Related Manuals for Tecumseh HH100
Summary of Contents for Tecumseh HH100
- Page 1 T E C H N I C I A N ' S H A N D B O O K This manual covers the following models: VH80, VH100, HH80, HH100, HH120, OH120-180 Model numbers are located on the engine shroud. Other illustrated Tecumseh 2-Cycle Engine, 4-Cycle Engine and Transmission manuals;...
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Page 2: Table Of Contents
CHAPTER 2. AIR CLEANERS, CARBURETORS, GOVERNORS AND LINKAGE ..............4 SECTION 1. AIR CLEANERS .............................. 4 SECTION 2. GENERAL CARBURETOR INFORMATION ....................5 SECTION 3. TECUMSEH CARBURETORS ........................6 SECTION 4. WALBRO CARBURETORS .......................... 10 HH80 - 120, VH80 - 100 .............................. 10 SECTION 5. -
Page 3: Chapter 1. General Information
CHAPTER 1. GENERAL INFORMATION SECTION 1. ENGINE IDENTIFICATION Tecumseh engine model numbers are stamped into SHORT BLOCKS. New short blocks are identified the blower housing, or are located on a nameplate by a tag marked SBH (Short Block Horizontal) or or tag on the engine in locations as illustrated. -
Page 4: Section 2. Engine Care
Fuel stabilizer (such as Tecumseh’s Part No. 730245) that further repairs may have to be performed. is added to the fuel tank or storage container. Always follow the mix ratio found on the stabilizer container. - Page 5 DRAINING THE FUEL SYSTEM: CAUTION: DRAIN THE FUEL INTO AN APPROVED CONTAINER OUTDOORS, AND AWAY FROM ANY OPEN FLAME OR COMBUSTION SOURCE. BE SURE THE ENGINE IS COOL. 1. Remove all gasoline from the fuel tank by running the engine until the engine stops, or by draining the fuel tank by removing the fuel line at the carburetor or fuel tank.
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Page 6: Chapter 2. Air Cleaners, Carburetors, Governors And Linkage
SECTION 1. AIR CLEANERS PAPER-TYPE AIR CLEANER SERVICE. Dry type POLYURETHANE-TYPE AIR CLEANER. Some paper air cleaners are utilized on all Tecumseh Large Tecumseh Large Frame engines may use a polyurethane Frame engines. These air cleaners have treated paper air filter in conjunction with a paper filter. -
Page 7: Section 2. General Carburetor Information
SECTION 2. GENERAL CARBURETOR INFORMATION CARBURETOR IDENTIFICATION. Tecumseh carburetors are identified by a model number and code date stamping on the carburetor as illustrated. ALTERNATE LOCATION FOR MODEL NUMBER This carburetor is used on the Overhead Valve engine 12, 14, 16 & 18 horsepower. -
Page 8: Section 3. Tecumseh Carburetors
SECTION 3. TECUMSEH CARBURETORS Following are initial carburetor adjustments to be NOTE: IDENTIFYING MARK WILL BE used to start the engine. After the engine has reached FOUND IN THE 3 O’CLOCK POSITION THROTTLE operating temperature make final adjustments. SHUTTER Main Adjustment... - Page 9 HIGH SPEED ADJUSTMENT SCREW. For service, INLET NEEDLE. The inlet needle is anchored to examine the taper of the high speed adjustment screw. the float tab by a clip, to assure proper movement If the taper is damaged at the area where it seats, of the inlet needle off of the seat when the float replace the screw and fuel bowl retainer nut as an drops.
- Page 10 HIGH SPEED NOZZLE. The carburetor body contains CARBURETOR BODY. When removing the choke a main nozzle emulsion tube pressed into the carburetor and throttle shafts, check shafts and bearings in body to a predetermined depth and positioned within carburetor body for wear. Any looseness in these the venturi of the carburetor.
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Page 11: Float Adjusting Procedure
FLOAT ADJUSTING PROCEDURE All Tecumseh carburetors with an adjustable float require the correct float height to achieve the proper operation and easy engine starts. To check the float setting, hold the carburetor in an upside down position. Remove the bowl nut, float bowl, and "O" ring. Place an 11/64"... -
Page 12: Section 4. Walbro Carburetors
SECTION 4. WALBRO CARBURETORS HH80 - 120, VH80 - 100 WALBRO CARBURETORS. Following are initial Install the throttle plate with the numbers (if present) carburetor adjustments to be used to start the engine. facing out when closed. Move the throttle shaft to After the engine has reached operating temperature, the closed position, place the throttle plate on the make final adjustments. - Page 13 Do not remove the main nozzle. If it is necessary to remove the main nozzle to aid in cleaning, discard the main nozzle and use a service replacement nozzle with an under cut in the thread area. If the nozzle removed is under cut it can be reused.
- Page 14 When assembling the float to the carburetor body, Prior to removing the fuel bowl nut, remove the high position the needle spring on the adjusting tag so speed adjustment needle. Use a 7/16'’ box end wrench that it hangs down. Hold the float spring under tension or socket to remove the fuel bowl nut.
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Page 15: Section 5. Overhead Valve Engine Carburetors
SECTION 5. OVERHEAD VALVE ENGINE CARBURETORS Overhead valve engines utilize Walbro carburetors. CARBURETOR SERVICING Throttle Shutter Install the throttle shutter with the numbers facing THROTTLE PLATE CHOKE LEVER out when closed. Move the throttle shaft to the closed position, place the throttle shutter on the shaft and THROTTLE RETURN SPRING secure with new retaining screws. - Page 16 Examine the tip of the high speed adjustment screw. INLET NEEDLE & SEAT. The inlet needle and seat If the tip of the screw is damaged, the seat, which are replaceable as an assembly. If the tip appears is part of the main nozzle, is probably damaged. damaged, replace the needle and seat assembly.
- Page 17 ASSEMBLING SEAT, SPRING & FLOAT. Shown below FIXED HIGH SPEED CARBURETOR. On carburetors is the float, hinge pin, seat and the float spring. of a later design the high speed screw has been replaced by a fixed speed nut. Adjustment is made only on the idle adjustment screw since the high DAMPER SPRING...
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Page 18: Section 6. Governors
SECTION 6. GOVERNORS This Governor Assembly is used on current production There is an oil groove on the inside of the spool to HH & OH Tecumseh Engines. prevent oil pressure from building up under the spool. SHAFT PRESSED TO GEAR Position the governor gear and flyweight assembly on the governor gear shaft. - Page 19 CYLINDER COVER GOVERNOR ADJUSTMENT FOR HORIZONTAL ENGINES GOVERNOR ROD PIVOT POINT “C” GOVERNOR “A” SPRING MOVE TO RETAINING RING ‘RUN’ POSITION “B” GOVERNOR SPOOL CONTACTS LEVER TURN CCW The governor rod is retained in the cylinder cover bushing with a retaining ring. GOVERNOR ADJUSTING The governor spool moves the governor rod by...
- Page 20 VERTICAL CRANKSHAFT GOVERNOR ADJUSTING FIXED SPEED. The fixed speed adjusting ADJUSTMENT. screw is the optional position “2”. Adjust it merely by starting the engine and after loosening the lock Move remote controls to RUN position. nut turn screw in (clockwise) to increase spring tension and hold engine at higher R.P.M.
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Page 21: Section 7. Impulse Fuel Pump
SECTION 7. IMPULSE FUEL PUMP IMPULSE FUEL PUMP. This pump is mounted onto FOUR SCREWS INTO the carburetor inlet and has connections from the BACKSIDE OF PLATE fuel supply and also a pulse line to the engine crankcase. CAUTION: IN ORDER FOR THE PUMP TO OPERATE TO BACKSIDE SATISFACTORILY THE CORRECT OIL LEVEL IN OF PLATE... -
Page 22: Chapter 3. Rewind Starters, Electric Starters, Troubleshooting And Generators
CHAPTER 3. REWIND STARTERS, ELECTRIC STARTERS, TROUBLESHOOTING AND GENERATORS SECTION 1. REWIND STARTERS REASSEMBLY. Lubricate the recoil spring and center REWIND STARTER DISASSEMBLY PROCEDURE shaft with a small amount of light grease. Place the 1. Clamp starter in a vise and pull rope out, and pulley over the center shaft and bottom. - Page 23 ASSEMBLING STARTER TO ENGINE. It is important VISE to center the starter hub containing the starter dogs in the center cup so there is equal contact on all the dogs into the teeth of the cup. Before securing the starter with the mounting screws, place the hub into the cup then pull the rope enough to cause the starter dogs to equally engage in the SCREW DRIVER...
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Page 24: Section 2. Electric Starters
SECTION 2. ELECTRIC STARTERS STARTER SERVICE, DISASSEMBLY Test and trouble shooting procedures for 12 volt starters INSPECTION. Part No. is found on identification tag. can be found in other Sections of this chapter. Used on large frame vertical and horizontal engines. 2. - Page 25 NEW STARTER MOUNTING SCREWS AND WASHERS BRUSH CARD BRUSH AND BRUSH SPRING (4) LOCK NUT ADJUSTING BOLT CYLINDER TERMINAL POST THRU BOLTS (2) COMMUTATOR STARTER MOTOR TESTS LOCK NUTS (2) END CAP a. Preliminary Tests 4. Assembly Before checking the starter motor perform the a.
- Page 26 ARMATURE CHECK. If commutator bars are glazed 3. With a pliers or vise grip tool, grasp the through- or dirty they can be turned down in a lathe. While bolts as close to the flanged end as possible rotating, hold a strip of 00 sandpaper lightly on the (away from the threaded end), and remove the commutator, moving it back and forth.
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Page 27: Section 3. 12 Volt Starter Trouble Shooting Chart
SECTION 3 12 VOLT STARTER TROUBLE SHOOTING CHART PROBLEM PROBABLE CAUSE Does not function Weak or dead battery Check charge and/or replace battery. Corroded battery terminals Clean terminals and/or connections. and/or electrical connections Brushes sticking Free brushes. Replace worn brushes and those that have come in contact with grease and oil. - Page 28 12 VOLT STARTER TROUBLE SHOOTING CHART (Cont.) PROBLEM PROBABLE CAUSE Intermittent operation Brushes binding in holders Free up brushes. Replace worn brushes and those that have come in contact with grease and oil. Dirty or oily commutator Clean and dress commutator. Replace any brush that has come in contact with grease or oil.
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Page 29: Chapter 4. General Valve Information, Cylinder Head And Breather Assembly
CHAPTER 4. GENERAL VALVE INFORMATION, CYLINDER HEAD AND BREATHER ASSEMBLY SECTION 1. GENERAL VALVE INFORMATION Adjusting valves for 8 horsepower and larger engines TURN ADJUSTING SCREW: CLOCKWISE TO (except valve-in-head engines) DECREASE LASH, COUNTERCLOCKWISE TO INCREASE LASH. Intake valve gap .010, (.254 mm) exhaust valve gap ROCKER ARMS .020, (.508 mm) set when engine is cold. - Page 30 VALVE REMOVAL PROCEDURE FOR VALVE-IN- REMOVAL OF ROCKER ARM HOUSING. Remove HEAD ENGINES. rocker arm housing by removing the retaining cap screws. The valve spring retainer cupped side must The following is necessary for cylinder head disassembly. be facing in the up position. REMOVAL OF ROCKER ARM HOUSING PARTS.
- Page 31 VALVE INSTALLATION. To reinstall valves, position NO MARGIN MARGIN valve caps and spring in the valve compartment. 1/32” (.787 mm) Valve spring free length should be checked and installed so the dampening coils are located opposite the keepers. FACE WRONG 45°...
- Page 32 THIS SYMBOL POINTS OUT IMPORTANT SAFETY INSTALLING NEW GUIDES INSTRUCTIONS WHICH IF NOT FOLLOWED NOTE For easy installation, the replacement guides COULD ENDANGER THE PERSONAL SAFETY should be placed in the freezer compartment of a AND/OR PROPERTY OF YOURSELF AND refrigerator or on ice for no less than 30 minutes OTHERS.
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Page 33: Cylinder Head Torque
SECTION 2. CYLINDER HEAD CYLINDER HEAD TORQUE. For 8 H.P. and larger BELLEVILLE WASHER engines (except valve-in-head engines), make sure CROWN SIDE UP surfaces are clean, then place new head gasket on cylinder and position head. FLAT WASHER Slide one belleville washer (crown toward bolt head) and one flat washer (sharp edge toward bolt head) over each bolt as shown in illustration. -
Page 34: Section 3. Breather Assemblies
SECTION 3. BREATHER ASSEMBLIES The Breather is a sealed assembly. If it is defective, replace the entire assembly. The rubber tube on the outside is not part of the assembly. Install the breather with the drain holes toward the base of the engine. Always use a new gasket. The retaining screws must be tight. -
Page 35: Chapter 5. Piston And Rings, Connecting Rods And Crankshafts
CHAPTER 5. PISTON AND RINGS, CONNECTING RODS AND CRANKSHAFTS SECTION 1. PISTON AND RINGS PISTON AND RING DISASSEMBLY. Always remove RING GROOVE CHECK. Check the side clearance ridge and carbon buildup before attempting to remove of the ring in the groove using a feeler gauge. If the piston and ring assembly from the cylinder. - Page 36 ARROWHEAD PISTON RING FEELER GAUGE MATCH MARKS RING CENTERED IN RING TRAVEL AREA ARROWHEAD FACING PUSH ROD TUBES CHECK RING INVERTED PISTON END GAP TO POSITION RING SQUARELY IN CYLINDER PISTON RING INSTALLATION. Only correct piston ring installation will assure full power. Carefully note the ring sequence when removing the worn rings from the piston.
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Page 37: Section 2. Connecting Rods
Torque to correct specifications 110-inch pounds (12.43 FOR ENGINE MODELS HH80, HH100 and HH120 Nm). After initial torque use a drift and a hammer and VALVE-IN-HEAD ENGINES. -
Page 38: Section 3. Crankshafts
SECTION 3. CRANKSHAFTS CRANKPIN WEAR. Crankpins should be examined Note the chamfer tooth on the crankshaft gear. This for wear, scoring, or out of-round. If any of these tooth is used as a reference mark to be matched conditions are noted, replace the crankshaft. See with the timing mark on the camshaft. -
Page 39: Chapter 6. Camshaft, Bearings And Seals
CHAPTER 6. CAMSHAFT, BEARINGS AND SEALS SECTION 1. CAMSHAFT CAMSHAFT GEAR TEETH WEAR. When servicing VALVE TIMING FOR ENGINE WITH HELICAL CUT engines, check the camshaft at the points indicated GEARS. by the asterisks in figure. Examine the gear teeth for wear and damage. -
Page 40: Section 2. Bearings
SECTION 2. BEARINGS BEARING ASSEMBLY. The following figure illustrates the correct assembly of the tapered crankshaft bearings. The bearing at the flywheel end of the crankshaft seats in an adjustable bearing cup “A” in the cylinder. The bearing cup “B” supporting the P.T.O. end of the crankshaft is a press fit in the cylinder cover. - Page 41 METHOD TWO - Cold Bearing. The crankshaft MUST be supported between the counterweights when pressing on bearings. Use a driver to direct the pressure of an arbor press onto the inner race of the bearing when installing. The bearing must be seated tight against the shoulder of the crankshaft counterweight TAP CRANKSHAFT LIGHTLY (on magneto end).
- Page 42 After the cylinder cover is secured to correct torque When the space measures .001'’ (.025 mm) to .007'’ (.178 mm) no gaskets required, or if over .007'’ and specification, place the engine in a stand or device shimmed with gaskets the end result is that there that will allow the P.T.O.
- Page 43 After determining the gap between the cover and The bearing cup should be examined for rust, pitting, the machined surface on the cylinder, determine the scuffing, cracks or other damage. shim thickness as follows to result in the required .002 - .007 (.051 - .178 mm) crankshaft end play. REMOVE BY TAPPING BEARING CUP PRESSED INTO ON INSIDE EDGE WITH...
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Page 44: Section 3. Seals
SECTION 3. SEALS Use an oil seal protector when removing covers from crankshaft. See Chapter 11 of Mechanics Manual under “Tools”, using tool as shown. Remove the cylinder cover at either the P.T.O. or flywheel end. Drive the SEAL PROTECTORL seal out of the cylinder cover from the inside out. -
Page 45: Chapter 7. Dyna-Static Balancing System
BALANCING SYSTEM. counterweights) This view of the side cover is from Dyna-Static ® Tecumseh’s Balancing system for horizontal the outside showing the pipe plugs which plug the crankshaft 10, 12, 14, 16 and 18 H.P. alignment holes during normal operation. - Page 46 Positioning of helical-type gears is the same as shown On current production models, the counterweight in the figure below. balancing gears are placed top and bottom of the crankshaft. The position dimension is the same as PISTON AT T.D.C. for side-by-side counterweight models. PISTON AT T.D.C.
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Page 47: Chapter 8. Ignition Systems, Charging Systems Battery Service And Electrical Control Panels
CHAPTER 8. IGNITION SYSTEMS, CHARGING SYSTEMS BATTERY SERVICE and ELECTRICAL CONTROL PANELS SECTION 1. IGNITION SYSTEMS SOLID STATE SYSTEM IGNITION SERVICE. e. Air Gap Checks. Adjust the system so that a .006/.010'’ (.152/.254 mm) clearance exists between a. General. Follow through the checks and the ignition unit and the long trigger pin in the explanations below, if everything checks ok, then flywheel. - Page 48 Coil Lead on 10 Amp Alternator Systems. Remove the coil lead from the ignition unit terminal. Attach the leads from a standard ohmmeter to the lead RETAINING eyelet and to ground to check series resistance SCREWS of the ignition generator coil. 1.
- Page 49 SOLID STATE IGNITION SYSTEM (NON- SPADE CONNECTOR FOR 20 AMP ALTERNATOR TYPE). IGNITION UNIT CHARGING COIL CAUTION: Do not attempt to crank engine with the primary wire of the transformer disconnected. Also do not allow the primary wire of the transformer to be grounded or arc.
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Page 50: Section 2. Charging Systems
SOLID STATE RECTIFIER REGULATOR MOUNTED STARTING MOTOR ON ENGINE (PROVIDED NOTE: Only when testing the D.C. output, should BY TECUMSEH) GREEN the D.C. output lead be disconnected from the GROUND IS THRU THE MOUNTING BOLTS battery. - Page 51 Before performing the following tests see page 48, A through F. TEST NO. 1 (NO CHARGE TO BATTERY) NOTE: Tests must be followed in their order of listing. EXAMPLE: Test No. 1 must be completed before proceeding to Test No. 2. Replace any defective part. 10 AMP ALTERNATOR TEST B+ TERMINAL WIRE Disconnect B+ at battery lead (NOTE: Keep test to a minimum with B+...
- Page 52 TEST NO. 4 (BATTERY ALWAYS CHARGING AT HIGH RATE) Check B+ to ground voltage with D.C. voltmeter. 1. 2500 RPM: Voltage over 14.7 volts. 1. Regulator not functioning. 2. 3000 RPM: Voltage over 14.7 volts. 2. Regulator not functioning. 3. 3600 RPM: Voltage over 14.7 volts. 3. Regulator not functioning. 4.
- Page 53 TEST NO. 2 (NO CHARGE TO BATTERY) Disconnect plug from regulator and test AC voltage at plug. 1. 2500 RPM: Voltage reads less than 1. Defective stator. 32 volts. 2. Over 32 Volts. 2. Defective regulator See Test No.3. 3. 3000 RPM: Voltage reads less than 3. Defective stator. 38 volts.
- Page 54 TEST NO. 4 (BATTERY ALWAYS CHARGING AT HIGH RATE) Check B+ to ground voltage with D.C. voltmeter. 1. If over 14.8 volts at 2500 RPM, 1. Regulator is not functioning. 3000 RPM, and 3600 RPM. D.C. VOLTMETER 2. If under 14.4 volts @ 2500 RPM. 2.
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Page 55: Section 3. Battery Service
SECTION 3. BATTERY SERVICE greater rating is recommended. BATTERY POWER DECREASES WHILE ENGINE CRANKING POWER REQUIREMENT BATTERY CONDITION. While the battery is built to INCREASES WITH FALLING TEMPERATURE satisfactorily withstand the conditions under which it will normally operate, excessive mechanical abuse leads to early failure. - Page 56 Check to determine if the vent holes in the caps are open. In normal usage the battery casing may be partially covered with a white powder. Clean such areas with a solution of 1 part bicarbonate of soda to 4 parts water.
- Page 57 Battery Condition Specific Gravity Discharged 1.110 to 1.130 No useful charge 1.140 to 1.160 1.170 to 1.190 1.200 to 1.220 1.230 to 1.250 100% 1.260 to 1.280...
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Page 58: Section 4. Electrical Control Panels
SECTION 4. ELECTRICAL CONTROL PANELS IGNITION CUT-OFF AMMETER BROWN TOGGLE SWITCH ON-OFF SWITCH BROWN HEAVY DUTY BATTERY PUSH BUTTON POWERED STARTER SWITCH CONTINUITY TESTER ELECTRICAL CONTROL PANEL SERVICE PART NO. 730155. The test procedures explained below REMOVE POSITIVE (+) LEAD WIRE FROM BATTERY will deal only with the control panel. - Page 59 To test ammeter remove right side panel. Remove brown wire from “On/Off” switch. Use a volt/ohm/ millimeter. Attach one test lead to the terminal the brown wire was removed from, attach other test lead to positive terminal of start switches. Set tester to STARTER SWITCH the ampere scale and start engine.
- Page 60 3. With the toggle switch in the “off” position, the STARTER SWITCH CONTINUITY TEST. Remove wires test light will light. from starter switch. Place test leads on to switch terminals. No continuity should exist (Test light should 4. With the toggle switch in the “on” position, the not light).
- Page 61 TROUBLESHOOTING FOR ELECTRICAL CONTROL PANEL, SERVICE PART NO. 730155. TROUBLE PROBABLE CAUSE REMEDY Electric Starter Does Not Crank Check to determine if crankshaft Relieve load on crankshaft. Engine turns freely; if not, check for Disengage associated binding belts, pulleys, clutches, equipment clutches, belts or etc.
- Page 62 TROUBLESHOOTING FOR ELECTRICAL CONTROL PANEL, SERVICE PART NO. 730198. TROUBLE PROBABLE CAUSE REMEDY Electric Starter Does Not Crank Check to determine if crankshaft Relieve load on crankshaft. Engine. turns freely; if not, check for Disengage associated equipment binding belts, pulleys, clutches, etc. clutches, belts or pulleys. Check battery connections for Correct problem.
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Page 63: Chapter 9. Troubleshooting
CHAPTER 9. TROUBLESHOOTING TROUBLESHOOTING Below is a list of common problems and remedies. Follow a uniform procedure to locate and eliminate the causes. Cause Remedy A. ENGINE FAILS TO START OR STARTS WITH DIFFICULTY No fuel in tank. Fill tank with clean, fresh fuel. Shut-off valve closed. - Page 64 C. ENGINE MISSES UNDER LOAD Cause Remedy Spark plug fouled. Clean and regap spark plug. Spark plug porcelain cracked. Replace spark plug. Improper spark plug gap. Regap spark plug. Pitted magneto breaker points. Clean and dress breaker points. Replace badly pitted breaker points.
- Page 65 Cause Remedy Governor not properly adjusted. Adjust governor. Carburetor not properly adjusted. Adjust carburetor. Intermittent spark at spark plug. Disconnect ignition cut-off wire at the engine. Crank engine. If spark, check ignition switch, safety switch and interlock switch. If no spark, check magneto. Check wires for poor connections cuts or breaks.
- Page 66 Cause Remedy New seal damaged upon installation. Use proper seal protector tools and methods for installing another new seal. Bent crankshaft causing seal to leak. Check crankshaft for straightness and replace if necessary. (Never straighten a bent crankshaft) Oil seal driven too far into cavity. Remove seal and replace with new seal using the correct driver tool and procedures.
- Page 67 K. TROUBLE SHOOTING CARBURETION POINTS TO CHECK FOR CARBURETOR MALFUNCTION Trouble Correction Carburetor out of adjustment ........4-12-13-14-15-17-22 Engine will not start ............ 1-2-3-4-5-6-7-9-12-13 Engine will not accelerate .......... 3-4-12-13-14-26 Engine hunts (at idle or high speed) ......4-5-9-10-11-12-13-14-22-23-26 Engine will not idle............5-9-10-12-14-15-16-22-23-24-26 Engine lacks power at high speed ......
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Page 68: Chapter 10. 8 H.p. & Larger Engine Specifications And Torques
SECTION 1. CROSS REFERENCE LIST FOR TABLE OF SPECIFICATIONS raftsman Craftsman Craftsman Craftsman Engine Model Model Engine Model Model Engine Model Model Engine Model Model 143.588032 HH80 143.629052 HH100 143.558012 HH80 143.589012 HH100 143.629062 HH100 143.558022 HH80 143.589022 HH100 143.558032 HH80 143.629072 HH100 143.589032 HH100 143.558052... - Page 69 Model HH80 HH100 HH120 U.S. Metric U.S. Metric U.S. Metric Displacement 23.7 384.4cc 23.7 284.4cc 27.66 453.4 cc Stroke 2-3/4'’ 69.85mm 2-3/4'’ 69.85mm 2-7/8'’ 73.025mm Bore 3.3120 84.125 3.3120 84.125 3.500 88.900mm 3.3130 84.150 3.3130 84.150 3.501 88.925mm Timing Dimension...
- Page 70 Model HH80 HH100 HH120 U.S. Metric U.S. Metric U.S. Metric Piston Pin Diameter .6873 17.457 .6873 17.457 .6873 17.457 .6875 17.463 .6875 17.463 .6875 17.463 Width Comp. Ring Groove .0950 2.413 .0950 2.413 .0950 2.413 .0960 2.438 .0960 2.438 .0960 2.438...
- Page 71 Model VH80 VH100 U.S. Metric U.S. Metric Valve Face Angle 45° 45° Valve Face Width .089 2.261 .089 2.261 .099 2.515 .099 2.515 Valve Lip Width 1.524 1.524 Valve Spring Free Length 1.885 47.879 1.885 47.879 Valve Guides STD Diameter .312 7.925 .312...
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Page 72: Section 2. Torque Specifications
SECTION 2. TORQUE SPECIFICATIONS 8 H.P. & LARGER ENGINES (EXCEPT VALVE-IN-HEAD) INCH POUNDS NEWTON METER Cylinder Head Bolts 180 - 240 20.3 - 27.1 Connecting Rod Lock Nuts 86 - 110 9.7 - 12.4 Mounting Flange or Cylinder Cover 100 - 130 11.3 - 14.7 Flywheel Nut 600 - 660... -
Page 73: Section 3. Valve-In-Head Engine Specifications
SECTION 3. VALVE-IN-HEAD ENGINE SPECIFICATIONS Model OH120 Model OH140 Model OH150 Model OH160 Model OH180 Description U.S. Metric U.S. Metric U.S. Metric U.S. Metric U.S. Metric See Note See Note See Note Displacement 21.1 346 cc 23.7 388 cc 27.66 453 cc 27.66 453 cc... - Page 74 Model OH120 Model OH140 Model OH150 Model OH160 Model OH180 Description U.S. Metric U.S. Metric U.S. Metric U.S. Metric U.S. Metric Side Clearance Ring .0015 .038 .0015 .038 .0015 .038 .0015 .038 .0015 .038 Groove Compression .0035 .089 .0035 .089 .0035 .089 .0035...
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Page 75: Section 4. Torque Specifications
SECTION 4. TORQUE SPECIFICATIONS VALVE-IN-HEAD TORQUE SPECIFICATIONS INCH Cylinder Head Bolts 180 - 240 20.3 - 27.1 Connecting Rod Screw or Nut 86 - 110 9.7 - 12.4 Mounting Flange Cylinder Cover Screw 100 - 130 11.3 - 14.7 Cylinder Cover Flywheel End 120 - 160 13.6 - 18.1 Flywheel Nut... -
Page 76: Chapter 11. Educational Materials And Tools
695015 Carburetor Troubleshooting. Covers identification IGNITION SYSTEMS TROUBLESHOOTING BOOKLET of carburetors used on Tecumseh engines and how 694903 to troubleshoot and repair them. VHS only. This booklet contains information on 695059 the identification, possible problems Understanding Tecumseh Ignition Systems. - Page 78 VALVE LAPPING TOOL TAPER GAP GAUGE No. 670154 - Valve lapping tool. No. 670256 - Taper Gap Gauge 1/32'’ OVERSIZE GUIDE REAMER No. 670284 - HH & VH80-120 and OH120-180 No. 670305 - Strap Wrench VIBRATION TACHOMETER No. 670156 - Vibration Tachometer No.