Re: Oil from Vents
Joakim Soya wrote:
> 2 1/4 Liter Petrol engine "problem"
> The Crankcase vent and the rocker case vent is "emitting" smal ammounts of
> oil over the Motor.
> Is these mushrom shaped domes ment to be empty, or shall they contain some
> kind of Oil retaining/recirculation apperatus, spoonge or net.
> And merry cristmas
Depends on the age of the engine. As originally built, the two vents had
wire wool in them, oiled to act as air cleaners. The oil is renewed by oil
mist from the engine, and these can be expected to emit small amounts of
oil mist, especially if there is a fair bit of leakage past the rings. In
later engines the one on the crankcase vent was replaced with a sealed cap
and a hose added which led to a Positive Crankcase Ventilation Valve and
thence to the intake manifold. A further hose led from the rocker cover
vent to the intake hose elbow above the carburetter. (I think the change
depended on the market, but probably about late sixties - but of course
both the engine and the bits are interchangeable)
This later system should not emit any oil vapour, but with a lot of leakage
past the rings allowing crankcase pressure to build up despite the PCVV, or
if the latter is faulty, leaks may appear anywhere. The most common source
of leaks is the rocker cover gasket and the seal below the rocker cover