1901-1953 Indian Motorcycle – Parts – Accessories

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  5. 78 – Junior Scout Tires, 1938 Oil Pump, Converting 34 And 35 Oil Pumps on 74s to the 37 Oil pump

JUNIOR SCOUT TIRES

When applying new 18″ x 3.30″ tires to Junior Scouts it is sometimes difficult to get the bead of the tire to completely fill the clincher of the rim. This results in tire wobble.

This condition may be corrected by applying a strong solution of water and Murphy’ s Oil Soap to the clincher of the rim before the new tire is installed. Murphy’ s Oil Soap may be purchased in one pound tins from the Phoenix Oil Company, Cleveland, Ohio.

THE 1938 OIL PUMP

We have received many requests for information on adjusting the 1938 oil pump for models 338 and 638. No adjustment is provided or required. The capacity of the return oil pump is so much greater than the feed pump that the sump is clean at all times and no reduction in feed pump capacity is necessary.

CONVERTING 1934 and 1935 OIL PUMPS ON 74s TO THE
1937 OIL PUMP

Some dealers and riders are confused when making the above oil pump conversion. The necessary material and operations for this conversion are as follows:

Two different pump bodies were used in 1934 – 85278 for 7/16 diameter feed plunger and 74623 for 3/8″ diameter feed plunger. All 1935 machines used 74623 bodies. If you have a pump body with 7/16 diameter feed plunger hole it will be necessary to order a new body 74623.

Use 1 – 40900Pump plunger – 1937
Use 1 – 37279Plunger guide screw
Use 1 – 40833Guide screw roller
Use 1 – 40509Cam shaft – front

It will also be necessary to replace front cam shaft bushings in both crankcase and cam case cover.

Use 1 – 40455Cam bushing in crankcase
Use 1 – 38106Cam bushing in cam case cover.

INDIAN MOTOCYCLE COMPANY

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