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That is your Hydrolic chain tensioner. (archive)
[ Follow Ups ] [ M5 (E28) Message Board ] [ Msg. Board FAQ ]
Posted by frank on April 26, 2001 at 20:31:36:

In Reply to: What the hell is this thing on my S-38 ? :) posted by Matt Evans on April 26, 2001 at 14:03:08:

Inside of that is a rubber disc that acts like a diaphram. The silver disc you are seeing is the outer case which the rubber sits in. Very common to have these go bad!
Ok, so i've got a _Bad_ oil leak. Its coming somewhere from the passenger side of the front of the motor. The top of the ac compressor is soaked in oil. Yesterday a friend managed to find a higher spot covered in fresh oil. Problem is, we have no idea what it is.

So, on the exhaust side of the S-38, theres the two exhaust manifolds, and then theres a big silver pipe. Looks like its cooling system stuff (as it later attaches to the upper radiator hose :)

At the front of this pipe, it like fans out into 3 or 4 other things. One of them is mounted at the bottom, towrads the motor. It's a little (about 2" in diameter) disc shaped thing and its nearly impossible to see. This is where we're seeing (well, feeling) a lot of fresh looking oil. The big "ring" on this disc spins pretty freely.

What is this thing ? Should it be leaking oil ? Is my oil leak higher up than this thing and this is just getting dripped on ? I can barely see it.

My only possible guess is that its a thermostat, but thats only because its round and looks like its tacked onto the cooling system, and i cant see where else on my motor the thermostat would be :)

Help!

Thanks,
Matt




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