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Tecumseh OHH60 Engine
General Technical Data
Tecumseh OHH60 Engine Specifications
Engine Model ........... Tecumseh OHH60
Engine Type ........... 4-cycle 1-cylinder overhead valve horizontal air-cooled gasoline engine
Number of Cylinders ........... Single
Displacement, cu.in (cc) ........... 11.9 (195.04)
Cylinder Bore, in (mm) ........... 2.80 (71.0)
Piston Stroke, in (mm) ........... 1.94 (49.2)
Rated Engine Power, hp (kW) ........... 6.0 (4.1)
Rated Engine Speed, rpm ........... 3600
Crankshaft ........... Iron alloy
Cylinder ........... Cast iron alloy
Lubrication System ........... Full pressure
Air Cleaner ........... Paper/poly element
Cooling System ........... Forced air
Ignition System ........... Electronic
Electrical System Rating, Volts ........... 12
Fuel System
Fuel System Type ........... Carburetor
Carburetor ........... Float type
Governor Type ........... Mechanical
Fuel Tank Capacity, qts (L) ........... 3.0 (2.85)
Dimensions and Weight
Overall Length, in (mm) ........... 15.7 (399)
Overall Width, in (mm) ........... 10.1 (255)
Overall Height, in (mm) ........... 14.5 (368)
Net Weight, lbs (kg) ........... 30.0 (13.5)
Tecumseh OHH60 Maintenance Data
Cylinder Block and Valves
Cylinder Bore Inside Diameter (Maximum), in (mm) ........... 2.796 (71.018)
Cylinder Head (Max. Out of Flatness), in (mm) ........... 0.005 (0.127)
Intake Valve Clearance, in (mm) ........... 0.004 (0.10)
Exhaust Valve Clearance, in (mm) ........... 0.004 (0.10)
Engine Oil and Filter
Engine Oil Type (Summer) ........... SAE 30, 10W-30
Engine Oil Type (Winter) ........... SAE 5W-30
API Service Classifications ........... SF, SG, SH, or SJ
Oil Capacity, qts (L) ........... 0.66 (0.62)
Air Filter Element Part Number ........... 36046 (Paper)/36634 (Poly)
Carburetor Adjustments
Main Pre-Set ........... Fixed jet
Idle Pre-Set ........... Fixed jet
Low Idle Speed, rpm ........... 1600-1800
High Idle Speed, rpm ........... 3600-3900
Ignition System
Spark Plug Type ........... Champion RN4C
Spark Plug Gap, in (mm) ........... 0.030 (0.762)
Ignition Module Air Gap, in (mm) ........... 0.013 (0.32)
Spark Plug Torque, Nm (ft-lbs) ........... 21 (28.5)
Service Intervals
Service Air Cleaner Element ........... Every 25 hours
Change Engine Oil ........... Every 25 hours
Clean Cooling Fins ........... Every 25 hours
Check and Adjust Spark Plug ........... Every 100 hours
Replace Air Cleaner Element ........... Every 100 hours
Check Carburetor Adjustment ........... Every 100 hours
Check and Adjust Valve Clearance ........... Every 200 hours
Replace Spark Plug ........... Every 200 hours
Tecumseh OHH60 Service Data
Cylinder Block
Cylinder Bore (Standard), in (mm) ........... 2.795 (70.993)
Cylinder Bore (Maximum), in (mm) ........... 2.796 (71.018)
Cylinder Main Bearing Diameter, in (mm) ........... 1.0005-1.0010 (25.413-25.425)
Cylinder Cover/Flange Main Bearing Diameter, in (mm) ........... 1.0005-1.0010 (25.413-25.425)
Crankshaft End Play, in (mm) ........... 0.006-0.027 (0.1524-0.6858)
Crankpin Journal Diameter, in (mm) ........... 0.9995-1.0000 (25.387-25.400)
Crankshaft Main Bearing Diameter (Flywheel Side), in (mm) ........... 0.9985-0.9990 (25.362-25.375)
Crankshaft Main Bearing Diameter (PTO Side), in (mm) ........... 0.9985-0.9990 (25.362-25.375)
Connecting Rod Diameter (Crank Bearing), in (mm) ........... 1.0005-1.0010 (25.413-25.425)
Camshaft Bearing Diameter, in (mm) ........... 0.4970-0.4975 (12.624-12.637)
Piston Diameter (Bottom Of Skirt), in (mm) ........... 2.7904-2.7920 (70.876-70.917)
Ring Groove Side Clearance (Compession Rings), in (mm) ........... 0.0020-0.0050 (0.051-0.127)
Ring Groove Side Clearance (Oil Ring), in (mm) ........... 0.0005-0.0035 (0.013-0.089)
Piston Skirt to Cylinder Clearance, in (mm) ........... 0.0030-0.0056 (0.076-0.142)
Ring End Gap, in (mm) ........... 0.007-0.017 (0.178-0.432)
Cylinder Head and Valves
Cylinder Head (Max. Out of Flatness), in (mm) ........... 0.005 (0.127)
Valve Clearance (Intake), in (mm) ........... 0.004 (0.1016)
Valve Clearance (Exhaust), in (mm) ........... 0.004 (0.1016)
Valve Seat Angle, deg ........... 46
Valve Seat Width, in (mm) ........... 0.035-0.045 (0.889-1.143)
Valve Guide Oversize Dimension (Intake), in (mm) ........... 0.2807-0.2817 (7.135-7.155)
Valve Guide Oversize Dimension (Exhaust), in (mm) ........... 0.2807-0.2817 (7.135-7.155)
Tecumseh OHH60 Tightening Torque Specs
Cylinder Head Bolts, ft-lbs (Nm) ........... 19.0 (26.0)
Connecting Rod Bolts, ft-lbs (Nm) ........... 9.0 (12.0)
Cylinder Cover or Flange, ft-lbs (Nm) ........... 9.5 (13.0)
Flywheel Nut, ft-lbs (Nm) ........... 35.0 (51.0)
Flywheel Nut (Cast Iron), ft-lbs (Nm) 46.0 (62.0)
Spark Plug, ft-lbs (Nm) ........... 21.0 (28.0)
Ignition Mounting (Direct to Cylinder), ft-lbs (Nm) ........... 3.7 (5.0)
Intake Pipe to Head, ft-lbs (Nm) ........... 9.6 (13.0)
Carburetor to Intake Pipe, ft-lbs (Nm) ........... 5.9 (8.0)
Muffler Mtg., ft-lbs (Nm) ........... 8.5 (11.5)
Recoil Starter, ft-lbs (Nm) ........... 4.1 (5.5)
Electric Starter to Cylinder, ft-lbs (Nm) ........... 8.2 (11.0)
Rocker Arm Stud Lock Nut, ft-lbs (Nm) ........... 10.0 (13.5)
Rocker Box Cover, ft-lbs (Nm) ........... 3.3 (4.5)
Alt. Coil Assy to Cylinder, ft-lbs (Nm) ........... 5.2 (7.0)
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