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International Automotive Technicians Network
Re: Some Ford 6.4 questions
Posted to HD/Fleet Forum on 12/1/2013

You know the relative compression test is enough diagnosis? At this point you are pulling the valve covers or heads anyway.

Check for excess crankcase pressure or pull the lower CAC tube (is there a lot of oil in it?)

That will make the decision easy. Anyt... Login to read more.