Re: Generator Questions and Answers, by R&J Control Inc
To the best of my knowledge the machines that Onan produced with oil filters have an oil pump and a pressure fed oil system.
The machines that were produced without an oil filter utilize "splash" oil design, they have no oil pump. The connecting rods actually employ a wing on it to bring the oil up and direct the oil to where it needs to be.
An oil filter would not function in this system, because there is no pump.
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Matt Schurman
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