1901-1953 Indian Motorcycle – Parts – Accessories

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  5. 88 – Clearances on 1939 Models

Clearances on 1939 Models

Model of Motorcycle

Scout Jr.Scout 45Chief 74Indian 4
Intake valve tappet clearance.004.004.004.002
Exhaust valve tappet clearance.006.006.006.006
Piston Clearances
— Top land.020.023.020.026
— Other lands.015.019.015.022
— Skirt standard.006.004.004.005
— Skirt, Bonneville.006.006
Piston ring end clearance.010-.020.010-.020.010-.020.010-.020
Spark advance – Standard7/16″-40°3/8″-37°1/2″-36°5/8″-45°
Spark advance – Bonneville5/8″-45°5/8″-40°
Valve seat degree35°35°35°45°
Valve lift end play.010.010.010
Cam shaft end play.006.006.006.002
Crankshaft end play.003
Connecting rod side play.015-.020.015-.020.015-.020.001-.002
Flywheel end play-drive sprocket off.017-.019.017-.019.017-.019
Flywheel end play-drive sprocket on.010-.012.010-.012.010-.012
Transmission end play.003-.005.003-.005.003-.005.014-.018
Transmission countershaft gear end play.010.010.010.002
Bevel gear back lash.005-.006
Camshaft bushing clearance.001-.0015.001-.0015.001-.0015.0015-.002
Piston pin clearance in rod, std .0015-.002.0015-.002.0015-.002.0015-.002
Piston pin clearance in rod, Bonneville.003.003
Model 339 StandardInlet opens10°(.060)B.T.D.C.
Exhaust opens60°(.795)B.B.D.C.
Model 339 BonnevilleInlet opens30°(.400)B.T.D.C.
Exhaust opens60°(.795)B.B.D.C.
Model 439Inlet opens12°(.033)B.T.D.C.
Inlet closes60°(.650)A.B.D.C.
Exhaust opens60°(.650)B.B.D.C.
Exhaust closes(.013)A.T.D.C.
Model 539Inlet opens10°(.037)B.T.D.C.
Exhaust opens60°(.625)B.B.D.C.
Model 639 StandardInlet opens10°(.050)B.T.D.C.
Exhaust opens60°(.730)B.B.D.C.
Model 639 BonnevilleInlet opens34°(.359)B.T.D.C.
Exhaust opens60°(.730)B.B.D.C.

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