Originally Posted by Seb
Thanks for the advice offer - im sure ill be in touch!!
The crank filter cover thingy....what is it and what does it do?
With older or worn turbo engines you can get a lot of Ďblow-byí which is gas passing down the sides of the pistons past the rings. This gas in turn forces oil vapour in the crank case out of the crank case breather. This oil vapour smells unpleasant and coats the deck at the back of the engine housing making it slippery.
One way of stopping this is to use a coalescing filter and drain off the recovered oil. The risk with these filters is that if they block they raise the crank case pressure to a point were the engine oil will unload via the sump pump or dip stick.
On a non turbo engine these oil vapours can be fed back into the engine and burnt but if you do this with a turbo it can oil up the turbo and causes problems.
Sorry this reads like a lecture but I have my serious head on this morning.