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Pinion Shaft Oil Pump Drive Gears for OHV Big Twin 1939→

Pinion Shaft Oil Pump Drive Gears for OHV Big Twin 1939→

Pinion shaft drive gears for the oil pump. Indicated years refer to the stock application. 1973-1984 gears can be used in 1954-1972 engines If you follow this rule:

  • 5 tooth gears on the pinion shaft require 25 tooth oil pump shaft drive gears.
  • 6 tooth gears on the pinion shaft require 24 tooth oil pump shaft drive gears.

  • for Oil pump
  • on pinion shaft

24/6 oil pump gear combination

The 24/6 gear combination in engines thru 1972 will increase oil volume and pressure to a certain extent but will not cure problems caused by worn oil pumps and/or bushings.