1901-1953 Indian Motorcycle – Parts – Accessories – Service

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  4. 1937 Service Shots
  5. 71 – Crank Case Loading With Oil and Excessive Oil Consumption


Check oil return line from crank case sump valve to pump for loose connections, which cause air leaks. When cleaning sump valve, make sure that the sump valve plate is assembled to sump housing, that valve is at bottom of sump housing.

This may be assembled two ways, one of them will raise the valve higher on
sump housing; automatically raising the oil level in crank case, permitting
fly wheels to dip in oil, causing over oiling of motor. Inspect disc
valve and screen. Note that screen does not touch return valve disc. This
disc must retain its proper seat.

Flush out oil tank every 2,000 miles for cleaner and trouble free


The hub bearing lock nut on brake drum side, has a tendency to loosen up
(due to not being tight against wheel bearing) allowing this bearing to
work out of hub, and transferring side thrust to the needle bearing side,
causing ends of needle rollers to wear hollow axle collar.

At the first indication of excess side play in wheels, check this nut up
tight and stake it in hub shell. Grease wheel bearings well. When removing
hub bearing lock nut on needle bearing side of wheel, be sure and
remove lock screw on rim of hub.

Starting with the following motor numbers, all Model 237, Model 337 and
Model 437 machines are fitted with a lock screw on the brake drum bearing
nut and will not need staking.

Model 237Motor No. BCG 696
” 337” ” CCG 2185
” 437” ” DCG 426

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