Help to locate oil leakage !

[tokriha]

I own a 1986 model 944, which i have a problem with a oil leakage on the right side of the engine (seen from the front). When i look down at the top of the engine i can see some oil spillage under the back of the inlet manifold - some place in the back end of the balance shaft housing, above the oil pan seal.

Before i start to service the engine, i want to know i anyone could tell me if this is a common oil leakage;
- Back of the balance shaft housing ?
- Oil cooler mounting seals ?
- Oil filling tube mounting seals ?

[ae1969]

I would venture to guess the oil filling tube seal.......

Hard to tell unless you get under the car.

Not oil cooler (other side)

[Lawrence Coppari]

My balance shaft housings leaked. So does the seal at the filler but the filler leak was slight so I let it slobber. Mine is an '86 951. The back of the balance shaft has these silly bobbin-like disks with an o-ring around them. It is squeezed between the housing and the block. The o-ring wears away and oil comes out the back. Mine also leaked between the housing and the block. I don't know why Porsche ever used the bobbin-like thing. Maybe they did it to provide future income. It has certainly worked!