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Re: Mysterious Oil Leak Followup
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Posted by Ari [Email] (#2847) [Profile/Gallery] (more from Ari) on Tue, 6 Nov 2001 13:45:03 Share Post by Email
In Reply to: Mysterious Oil Leak Followup, Tom 9KT, Tue, 6 Nov 2001 07:47:38
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There is a big difference between the oil pump gasket and the oil level sender. I usually just wipe the area down with an alcohol-soaked rag to clean things up, and look for fresh oil. The position of the two is significantly different, so you should be able to easily differentiate.

The oil pump is right behind the main pulley. The crankshaft comes out of the bottom of the engine through the timing chain cover, through the center of the oil pump, and ends in the main pulley. The oil pump is just a metal casting, kind of kidney-shaped and flat (about an inch thick), wedged between the timing chain cover and the main pulley. It has no hoses on it. If the oil is leaking from behind the pump, it's the oil pump O-ring, where it mounts to the timing chain cover. If it's leaking from the face (pulley side), then it's the main oil seal.

The oil level sender is mounted in the oil pan, at the lowest part of the engine. I haven't followed this case, so I don't know what year/engine you have. Depending on year/engine, the oil level sender is either mounted at the back or the front of the oil pan - all you'll see is a plastic connector held to the pan with a few small bolts, with a wire harness coming off. If it is the sender, it can be leaking either from the sender itself, or from its O-ring. The great majority of the time the leak is just the O-ring. Drain the oil (good time to do an oil change), pull out the old sender, and replace just the O-ring. Saab sells the O-ring for about $3, but if you bring it down to an autoparts store, they may be able to match it for about $0.50. Don't expect them to cross-match it from a book - they'll just open a big drawer of O-rings and match it that way.


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