Oil In My Air Filter

Gunner · Mar 17, 2004

no bronco84 becasue the stock valve covers still have the extended tube with the hole for the pcv hose. if you want to use the stock valve covers then you have to use the ricer way and get one of those little filters that go on the pcv hose support

150marshall · Oct 18, 2004

87Bronco351 said:
my 1987 bronco (carburated) when i take off my air filter lid there is motor oil puddles in the bottom of the filter pan, the oil is coming through the vent tube that goes from the valve cover to the air filter housing. im not sure of the problem.
what should i do???

yeah i had the same problem with my 90 f150 you most likely got a cracked piston skirt were the ring sits below the head of the piston. you best bet is to rebuild from there or replace. i'd go with rebuilding the whole engine and all of its componets.

EB Bronco · Oct 18, 2004

My 94 blew out the oil pan gasket because of too much crankcase pressure. I found out that my PVC valve would work, but the problem was the intake manifold where the hose plugged into was completely clogged and had no vacuum. Until I had time to get the intake out and cleaned I just took took the vent line and ran it up on the inner fender directly from the valve cover. I put a cheap filter on the end of it like one that would be mounted inside a carbed air cleaner housing. I changed out the filter once a month and didn't have a problem at all.

Roger

Broncoholics · Oct 18, 2004

Yup! go get a $3.00 oil/air filter oil cap on the valve cover.
This helped me when I had positive crank case pressure until I fixed the problem.
My problem was a blown out intake manafold gasket allowing exhaust into the motor. Did I already mention this? :wacko:

Seabronc · Oct 22, 2004

The system will work perfectly as designed without any hokey ricer adaptions or expensive valve covers, as long as there are no restrictions to the air flow path. The path is, in from the air cleaner, down thru the oil return holes in the driver side head, thru the oil pan, back up thru the oil return hole in the passenger side, thru the PCV valve and into the intake manafold, which is all driven by vacuum. You might also want to check the vacuum at the intake manafold, you could be looking at problems in that area also, typical is around 12 to 15 in. hg. The key here is unrestricted. If your engine has never had the valve covers off, you might be really surprised at the sludge build up under the cover. If it has been long enough you will be scooping it out. Also, if you have to do some cleaning in this area, change the oil filter a couple of times.

Check the return holes for restriction by sludge, the PCV valve, and the tube to the intake manafold. This also keeps your truck legal. This path draws the hot oil fumes into the cylinders and burns it with the fuel.

The filtered oil filler cap is OK if you have a Edelbroc filter or some other arrangement that does not allow for a stock air filter hose arrangement, but the return should still go into the intake manafold.

Good luck,

>-