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SECTION 3. VALVE-IN-HEAD ENGINE SPECIFICATIONS

Model OH120 Model OH140 Model OH150 Model OH160 Model OH180

Description U.S. Metric U.S. Metric U.S. Metric U.S. Metric U.S. Metric

See Note See Note See Note

Displacement 21.1 346 cc 23.7 388 cc 27.66 453 cc 27.66 453 cc 30.0 492 cc

Stroke 2.75 69.80 2.75 69.80 2.875 69.80 2.875 69.80 2.875 69.80

Bore 3.125 79.375 3.312 84.125 3.500 88.900 3.500 88.900 3.625 92.075

3.126 79.400 3.313 84.150 3.501 88.925 3.501 88.925 3.626 92.100

Spark Plug Gap .030 .762 .030 .762 .030 .762 .030 .762 .030 .762

Valve Clearance Intake .005 .0127 .005 .0127 .005 .0127 .005 .0127 .005 .0127

Exhaust .010 .254 .010 .254 .010 .254 .010 .254 .010 .254

Valve Seat Angle 46° 46° 46° 46° 46°

Valve Seat Width .042 1.067 .042 1.067 .042 1.067 .042 1.067 .042 1.067

.052 1.321 .052 1.321 .052 1.321 .052 1.321 .052 1.321

Valve Face Angle 45° + 45

45° + 45

Valve Face Width .094 2.388 .133 3.378 .133 3.378 .133 3.378 .133 3.378

Valve Lip Width .06 1.524 .06 1.524 .06 1.524 .06 1.524 .06 1.524

Valve Spring Free Length 1.915 48.641 1.980 50.292 1.980 50.292 1.980 50.292 1.980 50.292

Valve Guides STD Diameter .312 7.925 .312 7.925 .312 7.925 .312 7.925 .312 7.925

.313 7.950 .313 7.950 .313 7.950 .313 7.950 .313 7.950

Dia. Crankshaft Conn. 1.3750 34.925 1.3750 34.925 1.3750 34.925 1.3750 34.925 1.3750 34.925

Rod Journal 1.3755 34.938 1.3755 34.938 1.3755 34.938 1.3755 34.938 1.3755 34.938

Maximum Conn. Rod Dia. 1.3765 34.963 1.3765 34.963 1.3765 34.963 1.3765 34.963 1.3765 34.963

Crank Bearing

Shaft Seat Dia. for 1.1865 30.137 1.1865 30.137 1.1865 30.137 1.1865 30.137 1.1865 30.137

Roller Bearings 1.1870 30.150 1.1870 30.150 1.1870 30.150 1.1870 30.150 1.1870 30.150

Crankshaft End Play *None *None *None *None *None

.001 .025 .001 .025 .001 .025 .001 .025 .001 .025

.007 .178 .007 .178 .007 .178 .007 .178 .007 .178

Preload Preload Preload Preload Preload

Piston Skirt Diameter 3.121 79.273 3.3080 84.023 3.4950 88.773 3.4950 88.773 3.620 91.948

3.123 79.324 3.3100 84.074 3.4970 88.824 3.4970 88.824 3.622 91.999

Piston Pin Diameter .6876 17.465 .6876 17.465 .6876 17.465 .6876 17.465 .7810

.6880 17.475 .6880 17.475 .6880 17.475 .6880 17.475 .7812

Width Comp. Ring Groove .0950 2.413 .0950 2.413 .0950 2.413 .0950 2.413 .0955

.0960 2.438 .0960 2.438 .0960 2.438 .0960 2.438 .0965

Width Oil Ring Groove .1880 4.775 .1880 4.775 .1880 4.775 .1880 4.775 .1880 4.775

.1900 4.826 .1900 4.826 .1890 4.826 .1890 4.826 .1895 4.826

Note: First Model Year was designated as an HH140, 150, 160.

Tecumseh HH100 User Manual

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