Pull it off, clean it up real good, buy a new gasket from the dealer (~$1.80 or so) reinstall with some gasket sealer and see what happens. Then again when you get it off and can see daylight through it..... JB away!! If that works you saved some money, if not you were going to have to buy a part anyway.

__________________
If it ain't broke take it apart and find out why.

1983 300SD, 4 speed
1994 C280
1987 300TD wagon
1996 HD Road King

Ride in Peace Eric Peterson, Harley of Macon