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post #2 of (permalink) Old 09-10-2001, 08:04 PM
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Re: Oil In Air Cleaner of 4.0 L

do a compression test on it.. sounds like your rings are bad.. you can get a tester at like autozone.. they loan/rent these out.. test the compression.. should be about 150psi.. probably have one or more cylinders low.. around 120-130 range.. if so.. then squirt some oil into those low cylinders.. and retest them.. if it jumps up to 150+ then those cylinders have bad rings in them.. this is a common problem with any old engine..
what happens is as your engine runs.. the compression inside the cylinders gets passed by the rings.. and down into the crank case (oil pan).. as oil is pumped thru the engine.. (to the top) it should drain back to the oil pan.. but due to the bypassed gases that are in the crank case.. it now has a higher pressure than the rest of the engine.. so oil will take the path of least resistance.. ie.. out that unblocked hose and into your air cleaner..
for a temporary fix.. unplug it from you air cleaner.. and run it into a container.. ie. gatorade bottle.. when full dump out... just keep oil in the engine.. (this trick also works for when you blow out a rear main seal.. )

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