bad oil separator?

[wanna986]

Originally Posted by John V

If oil is pooling on top of your engine your oil fill tube is leaking. It may be cracked or it may just have a leak in the joint between the upper fill tube and the tube that meets the engine. The oil fill tube is a thin black plastic tube which is about 1.5" in diameter. If you run your finger under the underside of it and it comes back with fresh oil, you know that joint is leaking.

I disassembled mine, cleaned the interface with acetone, then sealed it with RTV since it was not cracked. No leak.

My pooling is safely a few millimetres deep and is contained by the waffle design of the casting.

So the AOS may be o.k. and it's just a leak at the junction? I guess my question is "What's the oil doing way up there?"

I have to try the oil cap as soon as I can.

Thanks, all.

[John V]

Way up where, in the oil fill pipe? Oil vapor is present in that pipe and if the seal isn't perfect, it will drip down. Pretty simple.

[Lil bastard]

In addition to de-foaming the oil, it's also an emissions device to keep the crankcase vapor from venting to atmosphere. Instead, it is drawn into the intake and burned during combustion.