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- Volvo V70 Oil Leak Problem
December 6, 2011, 3:57 pm
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What engine do you have in your S70?
Re: Volvo V70 Oil Leak Problem
I recently dealt with this problem in my 98 V70, with the B5254FS engine.
In my case the pressure inside the engine rose to the point that it
popped the camshaft seals out of their location and i would find oil
puddles on my garage floor.
The problem ended up being the small diameter hose that goes from the
end of the intake manifold (opposite end to the throttle body, right
side of the engine), to the flame arrestor, on the throttle body plastic
intake piece. This hose vents the engine when the throttle body is
closed, as when the car is decelerating or going downhill.
This hose, being small, gets clogged, and even worse, it's connection on
the flame arrestor, gets plugged for about a 7/16" long section. I
cleaned the flame arrestor using the right size drill bit, (yes, it was
that clogged). and the hose with a throttle body cleaner spray.
In the V70 this small line shares a plastic tubing jacket with the other
hose coming from the flame arrestor to the oil trap under the intake
manifold. It is possible to take the small hose by itself and clean it
inside, without having to take everything apart. Because the clogging
takes place by the flame arrestor, it may be possible to use throttle
cleaner spray with the lil red straw, to clear the hose without taking
I did take the oil trap, and all the hoses involved in the PCV circuit,
without taking the manifold out, just to find out that the problem was
just the clogging of the small hose and the flame arrestor, by the
throttle body. It was not easy.
I also needed to replace the oil filler cap seal after i was done with
the PCV system.
I hope this info helps you.