crank case breather

[andylamb]

where will i find this on a sdi (crank case breather) i also have low compresion on one piston will this be a burnt valve or worn rings

[ChrisJC]

There are breathers in each rocker cover (assuming you have EFi). One at the back of the passenger side, which is just a piece of foam under a plastic cover.
The other side at the front is a flame trap.

Low compression - you'll have to test for rings by sticking some oil into the bore and seeing if that improves matters.

Chris.