Engine problems
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New User
Joined: Oct 2002
Posts: 3
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Engine problems
My 91 F-150 with the 5.0 is blowing oil into the intake air filter box. I replaced the PCV valve, did not help. Also, the oil on the dipstick has rusty goo in it, even though it was just changed. Any ideas? It has about 210,000 miles, but I do not know if it was ever rebuilt before I bought it.
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Senior User
Joined: Oct 2002
Posts: 150
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Engine problems
which side of the air filter box is the oil on, the inlet side, or the engine? If it's on the engine side, combine that with rusty goo on dipstick, i'd say you might have a blown head gasket. try changing your oil and pay clse attention to the oil as it comes out. if it's milky in color, then you definitely have a coolant leak. and the only way i know to check for a blown head gasket, is compression test of your engine cylinders, and pressure testing your cooling system. I hope this helps and that whatever the problem is it's an easy fix.
Senior User
Joined: Nov 2002
Posts: 158
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From: Champlin USA
Engine problems
im not sure how a 91 engine is set-up but if its like mine its got a hose coming from one of the valve covers to the air box? ive never in all my years on planet earth understand why that design has lasted as long as it has. since day one, even on carburated engines they've combined the oil breather with the air filter and we all know what happens. oil starts shooting out the oil breather because the engine is getting old and there is more blow by gasses getting by the rings, and it clogs the air filter. heres my advice. rig up a seperate oil breather outside the air filter. if its gonna drip let it drip on the ground. as for the rusty stuff on your dipstick....well i havent exactly heard that one before. i use to have an old fairmont that use to get a lot of moisture in the oil and it look like a white goo on the dipstick. if you need to know if your getting coolant in your oil just drain the oil and look at it. if it has antifreez in it you'll see it sitting on top of the oil. then you might want to think about rebuilding that engine lol.
Elder User
Joined: Apr 2002
Posts: 543
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From: LA
Engine problems
Sounds like you have an overpressure in the crankcase, blowing the oil everywhere and coolant in the oil. Both effects may be caused by a cylinder head gasket leaking. You should do a compression leakdown test to make sure your head gaskets are fine. You also should not drive if your oil is a milkshake like brown emulsion. It has no lubrication capability and your engine will be toast in no time. Obviously there is coolant getting into the engine, most likely also at the head gasket.
Hope this helps. Sorry about the pessimistic view. Have it checked out asap and take it from there.
Cheers, George
Hope this helps. Sorry about the pessimistic view. Have it checked out asap and take it from there.
Cheers, George
Elder User
Joined: Apr 2002
Posts: 543
Likes: 0
From: LA
Engine problems
I wanted to make clear: The oil in the air filter can't directly come from the crankcase but the overpressure there can make it leak into the intake runners through the intake gasket.
Also do a cooling system pressure check.
Cheers, George
Also do a cooling system pressure check.
Cheers, George
