Join Date: Jul 2008
Location: Railton, Tasmania, Australia
Re: front oil leak
There is a tell-tale hole in the casting between the water and oil pump housings, it faces downwards. If oil is there then the oil pump seal is leaking. If there is oil around the oil pressure switch threads then that needs to be removed and re-sealed. If neither of these is the issue, then it's possible that the metal to metal joint between the engine case and the oul pump housing is weeping. Not normal, but possible. This being the case, the oil/water pump needs to be removed from the engine and the joint re-made. BMW specifies a ThreeBond product (1207 ??) I think. This is/can be a very technical joint to get right as it is under full system (oil) pressure and is reliant only on the sealant. Proper preparation is the key to a successful result. Failing this, I can't think of any other obvious source for the oil leak except a loose oil pan. Hope this helps.
1987 Yamaha TY250R
1991 Aprilia Climber 280
1988 K100RT (the pack horse)
2005 K1200LTE Light yellow metallic