Hi I wonder if you could help me, My friend has a 1991 Cavalier 2.0 Sri 8v, It began leaking oil from what we thought was the Sump Gasket, After replacing the sump gasket, it was still leaking. After laying under the car and getting a face full of oil, it seemed to be leaking just above the sump gasket, be hind the oil sensor. After taking out the Alternator, I was able to stick my arm down the back and find a triangular shape hole at the bottom of the block just behid the oil sensor, I thought it must have blown a hole in the block, but after going down the scrap yard they all seem to have this hole.
Looking in the Hayes Manual. ( A resort of a desperate man) It has a very poorley drawn picture indicating that sealant should be put on four areas of the sump when changing the gasket. One of the arrors seems to be near the oil pump / pickup pipe.
We took the sump off again and had a look, but where the oil is leaking from seems to be at least an inch higher than the sump. and the only thing I can see is a tiny hole up the side of the oil pump / pickup pipe.
I dont realy want to put a load of silicone up there if it is not the right place to put it. I suspect it must be somewhere else it is leaking, (possibly the oil pump) but I dont want to take the whole engine to pieces if it is just a case of filling the gap at the side of the oil pickup pipe with silicone.
Thanks Kieran, I will check taht out although I am not altogether sure it is that, as the Crank shaft seal is on the side of the engine and the oil is leaking from the back corner as it butts against the side of what I think is oil pump housing, Although it could also be the corner of the block