Re: Ford 9N Oil Filter...Is it supposed to have on

Posted by Jon Hagen on October 05, 2006 at 13:55:50 from (69.26.29.27):

In Reply to: Re: Ford 9N Oil Filter...Is it supposed to have on posted by Steve Bowling on October 05, 2006 at 13:28:53:

A bypass filter connects to a main oil gallery of the engine and bleeds off aprox 10% of the oil supply and runs it through a very tight filter that does a good job of removing even the very tiny particles from the oil,then returns it to the oil pan. The other 90% of the oil supply goes to the engine bearings unfiltered.

Most modern engines have "full flow" oil filters that filter 100% of the oil from the oil pump that goes to the engine bearings. Because of the large volume of oil that must be filtered,the "full flow" filter is not as "tight" and will not filter out the smallest particles in the oil. Many large diesel engines have the best of both filter systems,as they have both full flow and bypass filters installed on the same engine.

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