Oil leak

[wbrian63]

'92 300SE. I've got an oil leak coming from somewhere on the passenger side of the engine at the front.

I initially thought the leak was coming from the cam cover gasket. Cleaning that area has eliminated that as the source - it has stayed free of oil and the drip is back.

The leak is a very small one - each time I clean the pan, crossmember, etc, it takes weeks for it to return.

I thought it might be coming from the timing chain tensioner, but again, clean it off and the leak is back before that area gets oily again.

I think it's coming from something on the block behind the mounting bracket for the air pump/alternator.

Before I launch into pulling all that mess off, any ideas what might be back there? I'd like to have the seals/o-rings, etc on hand to prevent having to reassemble the car while I wait for parts.

Suggestions are appreciated.