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oil leaking

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New User

Apr 6, 2014, 3:28 PM

Post #1 of 3 (881 views)
oil leaking Sign In

1986 Ford F150 351 oil pushes up thru dipstick tube

Veteran / Moderator
nickwarner profile image

Apr 6, 2014, 3:48 PM

Post #2 of 3 (861 views)
Re: oil leaking Sign In

Check the PCV to see if it is plugged, and do a cylinder leakdown test. If your engine has gotten worn down rings you will get excessive blowby in the crankcase and that pressure has to go out somewhere.

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Apr 6, 2014, 3:49 PM

Post #3 of 3 (860 views)
Re: oil leaking Sign In

Is PCV valve on oil fill cap or on lower intake manifold? Seems they changed this engine exactly 7-21-86 to another style the next day!

Either you need to know they are not clogged up, broken grommet and hose must be good. Seems like the engine just can't handle plain blow-by well as dipstick tube should really have a slight vacuum not pressure coming out and doesn't,


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