Jim Grant's Tech Tips
Nissan Quest, Oil Leak
Q: We have a Ď95 Quest with 85k on it that
has developed an oil leak. You can smell this oil leak as it is burning
on the exhaust manifold. I did remove the plastic shields from the underside
and I do see that oil is leaking on the lower part of the studs of the
exhaust manifold where it attaches to the engine. I have a mechanic friend
coming to take a closer look, he thinks the leak is from the valve cover
gaskets up above, but I see no wet path from there. Any thoughts on this?...
right there with your friend on the valve covers being the cause for your
oil leak. The valve cover gaskets on your vehicleís engine are made out
a of rubber-like compound. The gasket will harden and shrink with age,
which explains why these gaskets are a common service item. Let your friend
get to work and repair that oil leak and hope itís the valve cover gaskets.
The next area for a possible cause is not so easy to work on! Oil leaking
on a hot exhaust manifold is a fire hazard that cannot be ignored.