Thread: mystery oil leak

Oil cooler hose?
There is an O ring on the pipe part of the hose, its just above the oil filter.
Can say I have touched the relief Vv ever.

Should have mentioned did the oil cooler hose o'ring thinking that was culprit
But not to be.

Check the oil pressure switch. There was an early type that failed and was replaced with a new type (and part no.)

Mine failed and it looked like the oil was coming from the filter. My engine is a GEMS.

If you pull the wheel arch liner you can see up into that area and also access the switch.

Ref replacing pressure relief valve o-ring, I have done it. However, we mustn't have refitted the circlip properly as quite some time (over a year) later, the circlip let go and the relief valve was ejected. The engine dumped all the oil in very short order.

Originally Posted by p38arover

Check the oil pressure switch. There was an early type that failed and was replaced with a new type (and part no.)

Mine failed and it looked like the oil was coming from the filter. My engine is a GEMS.

If you pull the wheel arch liner you can see up into that area and also access the switch.

Ref replacing pressure relief valve o-ring, I have done it. However, we mustn't have refitted the circlip properly as quite some time (over a year) later, the circlip let go and the relief valve was ejected. The engine dumped all the oil in very short order.

I had exactly the same thing with mine and there was a lot of head scratching by myself and the mechanic. Eventually it was discovered to be the oil pressure switch. I'd definitely go there first!

Ive found it easy to remove the fan, belt, and tensioner pulley to get to the oil pressure switch.

Originally Posted by benji

Ive found it easy to remove the fan, belt, and tensioner pulley to get to the oil pressure switch.

Don't run the engine for too long while checking for the leak!

From what we could see it did not look as though pressure switch is culprit however I was going to replace it anyway whilst I had created easy access.
thanks for comments re clip not seating & popping out ! That could be a catastrophic engine failure right there! Must make sure this is seated correctly before reassembling everything else.