4-CYCLE OVERHEAD VALVE ENGINES - Small Engine Discount

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SERVICE GOVERNOR ADJUSTMENT With the engine stopped, loosen the screw holding the governor lever to the governor shaft clamp. Push the governor lever to move the carburetor throttle plate to the wide open position. Rotate the governor clamp counterclockwise on all overhead valve engines covered in this manual. Hold the lever and clamp in this position while tightening the screw (diag. 2). PUSH LEVER TO WIDE OPEN THROTTLE Ý Ú GOVERNOR CLAMP SCREW THROTTLE LINK GOVERNOR LEVER GOVERNOR ROD GOVERNOR CLAMP SCREW THROTTLE PLATE THROTTLE OPEN (PUSH COUNTER- CLOCKWISE) THROTTLE OPEN (PUSH COUNTERCLOCKWISE) GOVERNOR LEVER GOVERNOR SCREW GOVERNOR ROD STANDARD LOCATION YOU MUST USE THIS LINK POSITION GOVERNOR CLAMP TURN CLIP COUNTERCLOCKWISE ON ALL VERTICAL SHAFT ENGINES EXCEPT VLV & VLXL. CLOCKWISE ON ALL HORIZONTAL SHAFT ENGINES EXCEPT OHH,OHSK 50,55 & OHM, OHSK 110,120. GOVERNOR GEAR AND SHAFT SERVICE 2 ROTATE LEVER & ROD COUNTER- CLOCKWISE OHH SERIES - NEW STYLE THROTTLE PLATE (TOP VIEW) OHH SERIES - OLD STYLE ROTATE CLAMP COUNTERCLOCKWISE After the cylinder cover is removed from the engine, the governor spool, gear, or governor shaft can be removed. On some governor assemblies, the retaining ring must be removed to allow the spool or gear to slide off the shaft. Other governor shafts use an upset to hold the governor spool on. If the gear requires replacement, the governor shaft will have to be removed. 3 Governor Gear or Shaft Replacement, Upset Style Governor Shaft 1. Grip the original spool in a vise and use a twisting and pulling motion on the flange until the spool is free. 2. Clamp the shaft in a vise and pound gently on the flange with a wooden or plastic mallet to remove the shaft (diag. 4). NOTE: DO NOT TWIST THE SHAFT WHEN REMOVING. THE SHAFT BOSS MAY BECOME ENLARGED AND THE PRESS FIT WILL NOT SECURE THE NEW GOVERNOR SHAFT. 3. To install a new shaft, first assemble the gear and washer on the shaft. Start the shaft into the hole with a few taps from a soft faced hammer. 4. Place the flange in a press with a solid piece supporting the area below the shaft boss. Press the shaft in until a part # 670297 (.0125" / .3175 mm) shim just becomes snug (.010" - .020" / .254-.508 mm clearance) (diag. 5). WASHER Not For Resale www.SmallEngineDiscount.com GEAR SHIM SHAFT BOSS 670297 (modified) 4 5 23
Governor Shaft Replacement, Retaining Ring Style 1. Remove the retaining ring, spool, gear assembly, and washer(s). 2. Clamp the shaft in a vise and pound gently on the flange with a wooden or plastic mallet to remove the shaft. NOTE: DO NOT TWIST THE GOVERNOR SHAFT WHEN REMOVING. THE SHAFT BOSS MAY BECOME ENLARGED AND THE PRESS FIT WILL NOT SECURE THE NEW GOVERNOR SHAFT. 3. Start the new shaft into the shaft boss by tapping with a soft faced hammer. 4. Refer to the chart at right for the proper shaft exposed length from the mounting surface. Add a drop of red Loctite 271 and press the governor shaft to the proper depth using a press or a vise. Wipe the extra Loctite off after installation. 5. Reassemble the washer (s), governor gear, and spool followed by the retaining ring. ENGINE MODEL EXPOSED SHAFT LENGTH OHH/OHSK50-70 1.319" - 1.334" OVRM (33.502 - 33.883 mm) OHM 1.085" - 1.100" OHSK80-130 (27.559 - 27.940 mm) OVM OVXL 1.350" - 1.365" OHV (34.290-34.671 mm) 6 RETAINING RING SERVICED AS ASSEMBLY RETAINING RING SPOOL RETAINING RING GEAR ASSY. (GOV.) SPOOL UPSET SHAFT SPOOL WASHER RETAINING RING GEAR ASSY. (GOV.) SPOOL SHAFT SPOOL WASHER RETAINING RING GEAR ASSY. (GOV.) WASHER SHAFT GEAR ASSY. (GOV.) WASHER WASHER SPACER SHAFT GEAR ASSY. (GOV.) WASHER WASHER SPACER NOTE; SPACER MAY BE PART OF THE GEAR ASSEMBLY. SHAFT 7 8 OVRM TYPE I OVRM TYPE II MEDIUM FRAME OHH / OHSK50-70 9 10 OVM / OHV / OHM OHSK80-130 11 24 Not For Resale www.SmallEngineDiscount.com
Page 1 and 2: 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: 22 CHAPTER 4 GOVERNORS AND LINKAGE
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 and 84:
13. On engine models OHH and OVRM,
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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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