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INDIAN INSRUCTION BOOK
TWELTH REVISION

FILLING TANKS

Models 237, 337, 637 - Remove filler caps from the front opening of the left tank and the rear opening of the right tank and fill to within one inch of the top with gasoline. Replace filler caps and turn until locked. Remove filler cap from front opening of the right tank and fill with Indian Oil to within 2" of the upper end of the return tube inside the tank. (See lubrication of motor on page 8 for recommended grade). Replace filler cap and turn until locked. The oil tank on models 237, 337, 637 is vented from underneath. The oil filter cap has no vents. Be sure to put the correct cap on the oil tank. Capacity of tanks: gasoline 3.7 gallons; oil, 2 1/2 quarts. 
Model 437-Remove filler caps from both right and left tanks and fill to within one inch of the top with gasoline. Replace both filler caps and turn until locked. (There is no oil compartment in 437 tank). Capacity of tank: 4.6 gallons gasoline.
Model 537-Remove filler caps from left tank an front opening of the right tank and fill to within one inch of the top with gasoline. Replace both filler caps and turn until locked. Remove the rear filler cap from the right tank and fill with Indian Oil to within 1/2" of the upper end of the return tube inside the tank. (See lubrication of motor on page 8 for recommended grade). Replace filler can and turn until locked. Capacity of tanks: gasoline, 2 5/8 gallons; oil, 2 quarts.
MOTOR LUBRICATION
[[Image - see next page for caption]]
^[[Figure 1]]
The lubrication system on models 237, 337, 537, and 637 is what is known as dry sump lubrication, which means that the oil is pumped from the tank to the motor in sufficient quantity to lubricate properly all parts of the motor at maximum speed, after which the surplus oil is returned to the tank by means of return pump. Note Figure 1.
The lubricating system on Model 437 is a conventional pressure feed lubrication, which means that the oil is pumped from the crankcase sump to all parts of the motor, and then returned to the crankcase sump by gravity. 
MOTOR CRANKCASE AND TANK LEVEL
Models 237, 337, and 637- For the best results the tank oil level should be as specified under the heading Filling Tanks. However, it it not absolutely necessary that this oil level be maintained, but can be allowed to drop to a point where it requires

Transcription Notes:
Edited: 1.2' to 1/2"