How does an oil pan gasket ''blow''
Common problem on the Ford 3.0 V6. How does an oil pan gasket blow? Does it
slip out? Have something to do with oil pressure? What exactly happens in
this problem that causes excessive leaking?
It is a common problem in ur case. Two causes. One is the most
common is caused by the gasket swelling & it blows out the front of the
pan.The other cause is a bad pvc valve that cannot remove excessive
crankcase pressure.
The gasket is rubber & has steel inserts at the bolt holes so it can not
slip or blow out,except at the front. Check figure #30 & #31 in link. The
quick repairs I have done is to cut out the swollen part in the front of the pan & fill with rtv. I have done maybe a dozen or so with no comebacks.Some people still (cost not a problem) want a whole new gasket or their pan is rust damaged to do the replacement route.
Stech is right, how ever there is one additional cause.
Many shade tree mechanics over tighten the oil pan gasket. Same thing on
autotranmission gaskets on the filter. Even ''skilled'' mechanics do this.
So check to make sure the PCV valve is working, and the hoses to it are
not blocked. With these working, the leak may slow down. But if you are
not loosing to much oil maybe just live with it.
Usually, the term ''blow(s) a gasket'' means the gasket went
bad.
However, and oil pan (or even a rocker cover) gasket can start leaking if
for some reason internal engine pressure gets too high, making the
pressure try to find an exit (the weakest point).
Usually this is a high mileage engine, worn rings, combustion blow by,
crankcase not ventilating properly.
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