4-CYCLE OVERHEAD VALVE ENGINES - Small Engine Discount

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5. Assemble the compression release components to the camshaft on engine models OHH and OHSK50-70. Install spring end "A" through the release from the pin side, insert spring end "B" through the camshaft gear, and slide the release pin in the small hole near the center of the cam gear. Assemble the thrust washer on the camshaft next to the compression release. (diag. 55) NOTE: Some OHH models used on chipper/ shredders may not require compression release mechanisms. 6. Some OHV11 - 17 engines come equipped with a spin on oil filtration system. If the engine is not equipped with a filter, one may be added IF THE SUMP HAS AN OIL PASSAGE COVER. The kit part number 36435A should be ordered to upgrade the engine if desired. 7. Install the lifters, camshaft, barrel and plunger style oil pump (chamfered side toward the gear) if applicable, ultra-balance shaft or dual balance shafts if applicable. Align the timing mark or notched tooth on the crankshaft gear to the mark or hole in the camshaft gear. If equipped, time the Ultra-balance ® with the piston at Top Dead Center (T.D.C.). Slide the drive gear over the keyway in crankshaft while aligning the timing marks on the gears. THINNER GEAR DRIVE GEAR, CRANKSHAFT MATCH MARK THICKER GEAR COMPRESSION RELEASE OIL PUMP SHAFT SCREW CHAMPFER UP TOWARD CAM CAMSHAFT INSERT SPRING END "A" COMPRESSION RELEASE SPRING A GASKET OIL PUMP ASSY. "O" RING OIL PUMP COVER THRUST WASHER B SCREW 55 OIL PASSAGE GASKET OIL FILTER OIL PASSAGE COVER 56 a. Dual Balance Shaft DUAL SHAFT COUNTERBALANCE Time the dual shaft counterbalance system with the piston at T.D.C. Install the counterbalance with the thicker gear in the far right boss in the crankcase and the other counterbalance shaft with the thinner gear in the far left boss while aligning the timing marks. Slide the drive gear over the keyway in the crankshaft while aligning the timing mark with the thicker counterbalance gear. NOTE: Engines equipped with rotary oil pumps must have the drive shaft and pump assembled after the sump cover is installed. CAM TIMING 57 58 ULTRA-BALANCE ® TIMING Not For Resale www.SmallEngineDiscount.com 59 77
8. Mount the cylinder cover or flange with the governor gear assembly installed to the crankcase using dowel pins to position the cover and a new gasket. Install the cover down onto the crankcase and slightly rotate the crankshaft to allow the governor gear to mesh. Do not force. Apply a drop of blue Loctite 242 to the cover screw threads and tighten to the specified torque. On engines with ball bearings in the cover, install a thrust washer (if applicable) over the crankshaft, followed by the retaining ring. SHAFT ROTOR 78 On OHV 13.5 -17 engines, install the oil pump drive shaft into the slot in the end of the camshaft. Apply engine oil and install the oil pump ring and rotor, followed by a new "O" ring and the pump cover. Tighten the screws to 50-70 inch pounds (5.5 - 8 Nm) torque. 9. Install the breather assembly. 10. Rotate the crankshaft to place the piston at Top Dead Center (TDC) on the compression stroke. NOTE: Always cut the valve seats, never only lap the seats. 11. Pre-assemble the valves and spring assemblies into the cylinder head on all engine models EXCEPT OHM, OHSK80-130, OVM, OVXL (diag. 65 on page 79). Use a small block to support the valves tight to their seats while placing the head on a flat surface. For models OHH and OVRM, install the springs (dampening coils toward the head) and retainers on the valves and use fingers to compress the springs until the notch in the retainer is located in the notch in the valve stem. Repeat the procedure for other valve. For OHV models, place the springs (dampening coils toward the head) over the valve guide and place the valve caps on the springs with the larger opening away from the springs. Use spring compressor tool part # 670315A installed on a rocker arm stud, and either turn the stud in or secure with a locking nut as shown so about 1-1/2" (38.1 mm) of the stud is exposed. Compress the spring and install the valve retainers to lock the valve to the valve cap. Repeat the procedure for other valve. Install the cylinder head using a new head gasket. On OHV 11-13 models, place the push rods in the block before installing the head and head gasket. Tighten the head bolts in the numbered sequence using 60 inch pound (6.8 Nm) increments to the specified torque. NOTE: Tecumseh strongly recommends you order a complete seal kit. Replace all "O" ring and gaskets in kit. RETAINERS HELD BY SPRING TENSION AGAINST THE CAP CAP RING ROTARY PUMP NOTE: INSTALL OIL PUMP AFTER THE SUMP IS ON Not For Resale www.SmallEngineDiscount.com RETAINER 60 61 62 VALVE SPRING COMPRESSOR TOOL PART NO. 670315 63
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Not For Resale www.SmallEngineDisco
Page 3 and 4:
Page TESTING PROCEDURE ............
Page 5 and 6:
SHORT BLOCKS SBV OR SBH IDENTIFICAT
Page 7 and 8:
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
Page 13 and 14:
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
Page 21 and 22:
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: SERVICE BUSHING We are supplying th
Page 83 and 84: 13. On engine models OHH and OVRM,
Page 85 and 86: 22. Attach the fuel tank (if applic
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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