Craftsman 143.629012 Specifications

T E C H N I C I A N ' S H A N D B O O KTECUMSEH8 TO 18 HPCAST IRONFOUR CYCLEENGINESThis manual covers the following models:VH80, VH100, HH80, H

8HIGH SPEED NOZZLE. The carburetor body containsa main nozzle emulsion tube pressed into the carburetorbody to a predetermined depth and positioned wi

9FLOAT ADJUSTING PROCEDUREAll Tecumseh carburetors with an adjustable floatrequire the correct float height to achieve the properoperation and easy en

10SECTION 4. WALBRO CARBURETORSHH80 - 120, VH80 - 100WALBRO CARBURETORS. Following are initialcarburetor adjustments to be used to start the engine.Af

11Do not remove the main nozzle. If it is necessary toremove the main nozzle to aid in cleaning, discardthe main nozzle and use a service replacement

12When assembling the float to the carburetor body,position the needle spring on the adjusting tag sothat it hangs down. Hold the float spring under t

13SECTION 5. OVERHEAD VALVE ENGINE CARBURETORSOverhead valve engines utilize Walbro carburetors.CARBURETOR ADJUSTMENT. Carburetor factoryadjustment sh

14Examine the tip of the high speed adjustment screw.If the tip of the screw is damaged, the seat, whichis part of the main nozzle, is probably damage

15ASSEMBLING SEAT, SPRING & FLOAT. Shown belowis the float, hinge pin, seat and the float spring.When assembling the float to the carburetor body,

16SECTION 6. GOVERNORSThis Governor Assembly is used on current productionHH & OH Tecumseh Engines.To position the governor gear assembly, insert

17The governor rod is retained in the cylinder coverbushing with a retaining ring.The governor spool moves the governor rod bycontacting the lever. Ou

ContentsPageCHAPTER 1. GENERAL INFORMATION ...

18VERTICAL CRANKSHAFT GOVERNORADJUSTMENT.Move remote controls to RUN position.Loosen screw “A”.Turn plate “B” counterclockwise (ccw) and hold.Move lev

19SECTION 7. IMPULSE FUEL PUMPIMPULSE FUEL PUMP. This pump is mounted ontothe carburetor inlet and has connections from thefuel supply and also a puls

20CHAPTER 3. REWIND STARTERS, ELECTRIC STARTERS,TROUBLESHOOTING AND GENERATORSSECTION 1. REWIND STARTERSREWIND STARTER DISASSEMBLY PROCEDURE1. Clamp s

21ROPE REPLACEMENT. Prepare the rope, place athin 3/4'’ (19.05 mm) diameter washer with a 1/4'’(3.175 mm) hole on the rope and tie a knot. T

22SECTION 2. ELECTRIC STARTERSSTARTER SERVICE, DISASSEMBLY ANDINSPECTION. Part No. is found on identification tag.Used on large frame vertical and hor

234. Assemblya. Install drive end cap, engaging nut and gear,anti-drift spring, spring retainer, retaining ring,and dust cover to armature. Install ar

24ARMATURE CHECK. If commutator bars are glazedor dirty they can be turned down in a lathe. Whilerotating, hold a strip of 00 sandpaper lightly on the

25SECTION 312 VOLT STARTER TROUBLE SHOOTING CHARTPROBLEM PROBABLE CAUSE FIXDoes not function Weak or dead battery Check charge and/or replace battery.

2612 VOLT STARTER TROUBLE SHOOTING CHART (Cont.)PROBLEM PROBABLE CAUSE FIXIntermittent operation Brushes binding in holders Free up brushes. Replace w

27CHAPTER 4. GENERAL VALVE INFORMATION,CYLINDER HEAD AND BREATHER ASSEMBLYSECTION 1. GENERAL VALVE INFORMATIONAdjusting valves for 8 horsepower and la

1CHAPTER 1. GENERAL INFORMATIONSECTION 1. ENGINE IDENTIFICATIONTecumseh engine model numbers are stamped intothe blower housing, or are located on a n

28VALVE REMOVAL PROCEDURE FOR VALVE-IN-HEAD ENGINES.The following is necessary for cylinder head disassembly.REMOVAL OF ROCKER ARM HOUSING PARTS.Locat

29VALVE INSTALLATION. To reinstall valves, positionvalve caps and spring in the valve compartment.Valve spring free length should be checked and inst

30THIS SYMBOL POINTS OUT IMPORTANT SAFETYINSTRUCTIONS WHICH IF NOT FOLLOWEDCOULD ENDANGER THE PERSONAL SAFETYAND/OR PROPERTY OF YOURSELF ANDOTHERS. RE

31SECTION 2. CYLINDER HEADCYLINDER HEAD TORQUE. For 8 H.P. and largerengines (except valve-in-head engines), make suresurfaces are clean, then place n

32SECTION 3. BREATHER ASSEMBLIESThe Breather is a sealed assembly. If it is defective,replace the entire assembly. The rubber tube on theoutside is no

33CHAPTER 5. PISTON AND RINGS, CONNECTING RODSAND CRANKSHAFTSSECTION 1. PISTON AND RINGSPISTON AND RING DISASSEMBLY. Always removeridge and carbon bui

34PISTON RING INSTALLATION. Only correct pistonring installation will assure full power. Carefully notethe ring sequence when removing the worn ringsf

35SECTION 2. CONNECTING RODSWhen reinstalling a used connecting rod ALWAYSuse new nuts on the bolts. These locking nuts willensure that the torque wil

36SECTION 3. CRANKSHAFTSCRANKPIN WEAR. Crankpins should be examinedfor wear, scoring, or out of-round. If any of theseconditions are noted, replace th

37CHAPTER 6. CAMSHAFT, BEARINGS AND SEALSSECTION 1. CAMSHAFTCAMSHAFT GEAR TEETH WEAR. When servicingengines, check the camshaft at the points indicate

2SECTION 2. ENGINE CAREFUELS. Use clean, fresh unleaded automotive gasolinein all Tecumseh four-cycle engines. (Leaded “regular”gasoline is an accepta

38SECTION 2. BEARINGSBEARING ASSEMBLY. The following figure illustratesthe correct assembly of the tapered crankshaft bearings.The bearing at the flyw

39METHOD TWO - Cold Bearing. The crankshaft MUSTbe supported between the counterweights when pressingon bearings. Use a driver to direct the pressure

40When the space measures .001'’ (.025 mm) to .007'’(.178 mm) no gaskets required, or if over .007'’ andshimmed with gaskets the end re

41The bearing cup should be examined for rust, pitting,scuffing, cracks or other damage.After determining the gap between the cover andthe machined su

42SECTION 3. SEALSUse an oil seal protector when removing covers fromcrankshaft. See Chapter 11 of Mechanics Manualunder “Tools”, using tool as shown.

43CHAPTER 7. DYNA-STATIC® BALANCING SYSTEMTECUMSEH DYNA-STATIC® BALANCING SYSTEM.Dyna-Static® Tecumseh’s Balancing system for horizontalcrankshaft 10,

44Positioning of helical-type gears is the same as shownin the figure below.CRANKSHAFT GEAR ALIGNMENTNOTE: Whenever the camshaft gear is damaged,the c

45CHAPTER 8. IGNITION SYSTEMS, CHARGING SYSTEMSBATTERY SERVICE and ELECTRICAL CONTROL PANELSSECTION 1. IGNITION SYSTEMSSOLID STATE SYSTEM IGNITION SER

46f. Coil Lead on 10 Amp Alternator Systems. Removethe coil lead from the ignition unit terminal. Attachthe leads from a standard ohmmeter to the lead

47SOLID STATE IGNITION SYSTEM (NON-ALTERNATOR TYPE).CAUTION: Do not attempt to crank engine withthe primary wire of the transformer disconnected.Also

3DRAINING THE FUEL SYSTEM:CAUTION: DRAIN THE FUEL INTO ANAPPROVED CONTAINER OUTDOORS, ANDAWAY FROM ANY OPEN FLAME ORCOMBUSTION SOURCE. BE SURE THEENGI

48SECTION 2. CHARGING SYSTEMSDo not force or modify connectors. Test values areidentical to original 20 amp alternator system.PRE-SERVICE CHECKSa. Che

49Before 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 listi

50TEST 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 n

51TEST 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

52TEST 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 n

53SECTION 3. BATTERY SERVICEBATTERY CHECK. Because the battery is part oftwo circuits starting, ignition and charging (in theignition circuit, only in

54Check to determine if the vent holes in the capsare open.In normal usage the battery casing may be partiallycovered with a white powder. Clean such

55Battery Condition Specific GravityDischarged 1.110 to 1.130No useful charge 1.140 to 1.16025% 1.170 to 1.19050% 1.200 to 1.22075% 1.230 to 1.250100%

56SECTION 4. ELECTRICAL CONTROL PANELSELECTRICAL CONTROL PANEL SERVICE PARTNO. 730155. The test procedures explained belowwill deal only with the cont

57To test ammeter remove right side panel. Removebrown wire from “On/Off” switch. Use a volt/ohm/millimeter. Attach one test lead to the terminal theb

4CHAPTER 2. AIR CLEANERS, CARBURETORS,GOVERNORS AND LINKAGESECTION 1. AIR CLEANERSPAPER-TYPE AIR CLEANER SERVICE. Dry typepaper air cleaners are utili

583. With the toggle switch in the “off” position, thetest light will light.4. With the toggle switch in the “on” position, thetest light will not lig

59TROUBLESHOOTING FOR ELECTRICAL CONTROL PANEL,SERVICE PART NO. 730155.TROUBLE PROBABLE CAUSE REMEDYElectric Starter Does No

60TROUBLESHOOTING FOR ELECTRICAL CONTROL PANEL,SERVICE PART NO. 730198.TROUBLE PROBABLE CAUSE REMEDYElectric Starter Does Not Crank Check to determine

61CHAPTER 9. TROUBLESHOOTINGTROUBLESHOOTINGBelow is a list of common problems and remedies. Follow a uniform procedure to locate and eliminatethe caus

62C. ENGINE MISSES UNDER LOADCause RemedySpark plug fouled. Clean and regap spark plug.Spark plug porcelain cracked. Replace spark plug.Improper spark

63Cause RemedyGovernor not properly adjusted. Adjust governor.Carburetor not properly adjusted. Adjust carburetor.Intermittent spark at spark plug. Di

64Cause RemedyNew seal damaged upon installation. Use proper seal protector tools and methods forinstalling another new seal.Bent crankshaft causing s

65K. TROUBLE SHOOTING CARBURETIONPOINTS TO CHECK FOR CARBURETOR MALFUNCTIONTrouble CorrectionCarburetor out of adjustment...

66CHAPTER 10. 8 H.P. & LARGERENGINE AND TORQUE SPECIFICATIONSALSO VALVE-IN-HEAD SPECIFICATIONS AND TORQUESSECTION 1. CROSS REFERENCE LIST FOR TABL

67NOTE: All dimensions are in inches and millimeters unless noted.Model HH80 HH100 HH120 U.S. Metric U.S. Metric U.S. MetricDisplacement

5SECTION 2. GENERAL CARBURETOR INFORMATIONCARBURETOR IDENTIFICATION. Tecumsehcarburetors are identified by a model number andcode date stamping on th

68Model HH80 HH100 HH120U.S. Metric U.S. Metric U.S. MetricPiston Pin Diameter .6873 17.457 .6873 17.457 .6873 17.457.6875 17.463 .6875 17.463 .

69Model VH80 VH100U.S. Metric U.S. MetricValve Face Angle 45° 45° 45o45oValve Face Width .089 2.261 .089 2.261.099 2.515 .099 2.515Valve Lip Width .06

70SECTION 2. TORQUE SPECIFICATIONS8 H.P. & LARGER ENGINES (EXCEPT VALVE-IN-HEAD)INCH POUNDS NEWTON METERCylinder Head Bolts 180 - 240 20.3 - 27.1C

71SECTION 3. VALVE-IN-HEAD ENGINE SPECIFICATIONSModel OH120 Model OH140 Model OH150 Model OH160 Model OH180Description U.S. Metric U.S. Metric U.S.

72Model OH120 Model OH140 Model OH150 Model OH160 Model OH180Description U.S. Metric U.S. Metric U.S. Metric U.S. Metric U.S. MetricSide Clea

73SECTION 4. TORQUE SPECIFICATIONSVALVE-IN-HEADTORQUE SPECIFICATIONSINCH NmCylinder Head Bolts 180 - 240 20.3 - 27.1Connecting Rod Screw or Nut 86 - 1

74CHAPTER 11. EDUCATIONAL MATERIALS AND TOOLSVIDEO PROGRAMS695015Carburetor Troubleshooting. Covers identificationof carburetors used on Tecumseh engi

75

76TAPER GAP GAUGENo. 670256 - Taper Gap Gauge1/32'’ OVERSIZE GUIDE REAMERNo. 670284 - HH & VH80-120 and OH120-180VIBRATION TACHOMETERNo. 6701

6SECTION 3. TECUMSEH CARBURETORSFollowing are initial carburetor adjustments to beused to start the engine. After the engine has reachedoperating temp

7HIGH SPEED ADJUSTMENT SCREW. For service,examine the taper of the high speed adjustment screw.If the taper is damaged at the area where it seats,repl