Hello check out the link to Brian Carlton's advice and follow it. That definitely worked. The other thing I found out was to use a 6mm wrench on the 6mm hex socket worked pretty good. You will need the longer end of the allen key to get the bolts out of the top of the housing. Also with the 6mm wrench you can get a piece of pipe to use as a cheater bar.
I don't have a leak from that gasket any more. Good Luck
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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