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Oil Pump Driven Gears for OHV Big Twin 1939→

Oil Pump Driven Gears for OHV Big Twin 1939→

Driven gears for the oil pump shaft. Indicated years refer to the stock application. If you change gear combinations 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

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.

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