Oil/Breather Cap Leaking - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

dean35 · 11-10-2005, 14:06

I can't seen to figure out why my oil/breather cap keeps leaking oil onto the valve cover, it runs down onto the manifold and burns off. I have bought 2 different caps and neither one of them work. I have used form a gasket sealer and rtv silicone and nothing works. The truck is a 1980 F-100 with a 302

Any suggestions ?? I will be greatful!!!

Cronicus · 11-10-2005, 17:36

sounds like you got a bad gromet.
the thing the pcv crank vent slides into.
besides that i wouldent worry about keeping the oil in.
if your not overfiling the oil, not overrevin, then u proly have a valve problem, 1 might be over extending.
Is there any oil on the plugs?
and last how many miles u got?

dean35 · 11-10-2005, 19:37

the oil is not coming out of the gromet, it is where the cap and valve cover meet. If i drive say, 20 miles, i got through a quart of oil. I have tried 2 different types of caps, one with the pcv/breather cap and hose and the one with out the pcv valve and hose. I am not over filling, have changed the valve cover gasket, and can see where the oil comes out of the cap at where the valve cover and cap meet, and it is a twist on type cap. The turn is like a half turn to lock it on. Do they make a valve cover for the f-100 that has a screw on cap instead of a twist on cap?

Cronicus · 11-11-2005, 04:16

wait im not shure what your saying here but if the gromet is good, and so is the pcv caps and hoses, the oils proly coming right outa the oil cap, wher u pour oil in, take sum plumbers tape and wrap it around the groves on it, vary careful not to drop any inside the headcover.
if that stops it start looking into aftermarket oil caps.

dean35 · 11-13-2005, 15:02

I had a friend that told me that the problem maybe call something like "Blow By" something as to where the rings are worn and oil is pushing it's way back out. Ever heard of such? I just know I am going through 2 quarts of oil every 20 miles. and it sucks!

Cronicus · 11-13-2005, 19:59

"going through 2 quarts of oil every 20 miles. and it sucks!"
its done

use a 10w40 castrol and sell it if u can :(

btw if ur plugs dont show signs of oil ur rings are fine, n its a upperend valvetrain problem

XFFAIRMONT · 11-13-2005, 20:24

Have you taken off the rocker cover? Have you had this problem since you had the car or done anywork on it. It may be missing the splash shield thingy that goes over the hole in the rocker cover to stop this happening. Can't remember their proper name.

Cronicus · 11-14-2005, 03:58

seriously bro get another gasket/thermatex and take the valve cover off, inspect!

dean35 · 11-14-2005, 07:37

I have replaced the valve cover gasket twice within a month. The splash guard I beleive you are talking about is in place. Where I pour the oil in, there is a sheild
thats suppose to deflet the oil I guess. There is no oil on the plugs. all of the plugs are clean. so why is the oil pushing it's way back out? and how? I have had the truck about little over a month, and have replaced the head gaskets, intake manifold gaskets, valve cover gaskets, coil, distribitor, water pump, thermostat, oil cap, and pcv valve.

Cronicus · 11-14-2005, 16:38

end conclusion is this, #1 u got it juiced up nice, #2 ur over reven
#3 compression is through the roof
#4 is a valve is overextending?