Ok, this is on a '79 300 D.

I have a very bad oil leak at what was told to me as, where a "mechanical tachometer" would hook up to. Now I have never seen a mechanical tach on a 300 D, but maybe there is, I dont know. Located on the drivers side of the head next to the #1 cylinder and glow plug.

Anyway the oil leaks only while the engine is running. It bubbles up between the "bearing" and the head. Not where the large bolt and crush washer go. Looking down the hole and poking around with a screwdriver, the shaft is connected to something in the engine and will obviously not rotate with the engine off.

I had mentioned to a friend of mine who says there is an "O" ring on the outside of the bearing between the head that is causing the leak. But he does not know how to remove the bearing.

Question is: How the heck do you remove the bearing to replace the O ring? It sure does not lift out.

Maybe a special puller?

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