4-CYCLE OVERHEAD VALVE ENGINES - Small Engine Discount

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On models OHV 135 - 175 hold a 1/2" wrench on the rocker arm bearing while tightening the 5/32" Allen head set screw to 75 in. lbs. (8.5 Nm) of torque. Rotate the crankshaft at least one full turn to check push rod movement and valve lash (diag. 70). Current production models OHV135 - 175 use a 1/2" wrench to tighten the rocker arm bearing to the correct valve lash. Once adjusted use a 1/2" socket and torque the jam nut to 130 inch pound (14.7 Nm). Rotate the crankshaft one full turn to check push rod movement and correct valve lash (diag. 71). 15. Install the rocker arm cover using a new gasket or o-ring and tighten the screws to the specified torque. Connect the breather hose to the valve cover fitting on model OHH. 16. Attach the backing plates or baffles. Attach the governor arm lever if removed. 17. Attach the alternator coil if applicable and route the wires away from the flywheel area. 18. Install the flywheel spacer if applicable, flywheel key, flywheel, starter cup (if applicable), bevelled washer (concave surface in), and flywheel nut. Use strap wrench part # 670305 to hold the flywheel and tighten the nut to the specified torque. 19. Install the ignition module using a part # 670297 .0125" (.3175 mm) air gap tool between the flywheel magnets and the laminations of the module (diag. 72). Tighten the mounting screws, remove the tool, and check for contact while rotating the flywheel. None should be found. Attach the ignition ground lead to the module terminal. 20. Install the blower housing on all engines with the speed control mounted on the blower housing or engine block, and attach the ignition groundout lead at the control if applicable. 21. Install the intake pipe, speed control, carburetor, and air cleaner assembly while hooking the throttle and governor linkage. Install the blower housing on all engines with intake pipe mounted speed control brackets. Check the governor and speed control hookup and adjustment - see Chapter 4 under "Service". 1/2" TORQUE WRENCH 5/32" ALLEN WRENCH 1/2" WRENCH OHV135 - 175 70 1/2" WRENCH .0125" (.3175 mm) AIR GAP 71 72 Not For Resale www.SmallEngineDiscount.com 81
22. Attach the fuel tank (if applicable) using bolts or wedging the tank in the blower housing slots provided. Attach the fuel line and secure with clamps. 23. Slide the fuel line on the carburetor fitting and secure with a clamp. Slide the breather tube on the carburetor or air cleaner fitting if applicable. NOTE: If the tank is supplied by the O.E.M. replace the fuel filter. Tecumseh's tanks have a fuel filter in the tank and service is not necessary. 24. Fill the engine with oil to the full mark on the dipstick. Add fresh fuel to the fuel tank and secure the cap. 25. Install the spark plug and high tension lead. Mount the engine to the equipment and connect wiring and control cables. OVRM rotary mower engines require the blade to be secured to the blade hub adapter and crankshaft before attempting to start the engine. 26. Start the engine and allow it to run approximately five minutes to reach operating temperature. Optimize the carburetor if adjustable, verify top no load and idle RPM settings. SLIDE TANK REMOVE BOLTS 73 82 Not For Resale www.SmallEngineDiscount.com
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Not For Resale www.SmallEngineDisco
Page 3 and 4:
Page TESTING PROCEDURE ............
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SHORT BLOCKS SBV OR SBH IDENTIFICAT
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STORAGE (IF THE ENGINE IS TO BE UNU
Page 9 and 10:
TROUBLESHOOTING OR TESTING If the e
Page 11 and 12:
8 CHAPTER 3 CARBURETORS AND FUEL SY
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CARBURETOR VISUAL IDENTIFICATION Se
Page 15 and 16:
TESTING 12 1. After repeated effort
Page 17 and 18:
If further adjustment is required,
Page 19 and 20:
FLOAT ADJUSTING PROCEDURE All Tecum
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ASSEMBLY PROCEDURE Welch Plugs To i
Page 23 and 24:
Inlet Needle and Seat Make sure the
Page 25 and 26:
22 CHAPTER 4 GOVERNORS AND LINKAGE
Page 27 and 28:
Governor Shaft Replacement, Retaini
Page 29 and 30:
NOTE: Early production OHH engines
Page 31 and 32:
OVM, OVXL, OHV VERTICAL SPEED CONTR
Page 33 and 34: CAUTION: HANDLE MATCHES SAFELY TO A
Page 35 and 36: 32 4. Use a small Phillips screwdri
Page 37 and 38: Stylized Starter (OHV 13.5 -17) 34
Page 39 and 40: CONVERTING ALTERNATING CURRENT TO D
Page 41 and 42: TROUBLESHOOTING ELECTRICAL STARTER
Page 43 and 44: TESTING PROCEDURE STARTING CIRCUIT
Page 45 and 46: 3 AMP DC ALTERNATOR SYSTEM - DIODE
Page 47 and 48: CHECKING THE SYSTEM: To check the s
Page 49 and 50: 10 Amp A.C. Alternator CHECKING THE
Page 51 and 52: LOW OIL PRESSURE SENSOR Test the se
Page 53 and 54: CHAPTER 7 FLYWHEEL BRAKE SYSTEMS GE
Page 55 and 56: BRAKE BRACKET ASSEMBLY Late product
Page 57 and 58: The flywheel with magnets provide t
Page 59 and 60: SERVICE To remove the ignition modu
Page 61 and 62: CHAPTER 9 INTERNAL ENGINE AND CYLIN
Page 63 and 64: COMPONENTS The cylinder block house
Page 65 and 66: ENGINE OPERATION PROBLEMS ENGINE MI
Page 67 and 68: ENGINE VIBRATES EXCESSIVELY 64 1. R
Page 69 and 70: 10. Remove the flywheel key and alt
Page 71 and 72: CYLINDERS Visually check the cylind
Page 73 and 74: PISTONS, RINGS, AND CONNECTING RODS
Page 75 and 76: Mechanical Compression Release (MCR
Page 77 and 78: CRANKCASE BREATHERS The breather el
Page 79 and 80: SERVICE BUSHING We are supplying th
Page 81 and 82: 8. Mount the cylinder cover or flan
Page 83: 13. On engine models OHH and OVRM,
Page 87 and 88: 84 ENGINE SPECIFICATIONS OVRM40 OVR
Page 89 and 90: OVERHEAD VALVE TORQUE SPECIFICATION
Page 91 and 92: CHAPTER 11. EDUCATIONAL MATERIALS A
Page 93 and 94: OIL SEAL DRIVER OIL SEAL REMOVER No
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4-CYCLE OVERHEAD VALVE ENGINES - Small Engine Discount

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