Harley Davidson motorcycles 1940 to 1947 inclusive O.H.V. engine / side valve engine. Service Manual — page 10

Renewing Main Drive Gear Oil Seal

To do a satisfactory job of renewing oil seal requires a special tool.

It is not recommended practice to drive in an oil seal, as doing so may damage the seal. A dam-aged or improperly installed seal will result in oil leakage.

Complete instructions for renewing oil seal are included with Harley-Davidson oil seal tool, Part No. 12734-42. See Illus.. 131, 132, 133, 134 and 135.

TRANSMISSION LUBRICATION

After initial servicing of new motorcycle, (see Page 10), check oil level every two weeks, or every 1000 miles, whichever comes first, and add oil if necessary. Fill to level of filler opening. Use Harley-Davidson "Regular Heavy" engine oil in summer and "Medium Heavy" oil in winter. In extremely cold weather, if shifting becomes difficult due to transmission oil becoming concealed to some extent, thin with a small amount of kerosene.

Motorcycle should be standing straight up, not leaning on Jiffy Stand, when adding oil to transmission.