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Old 10-12-2005, 01:46 PM
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Weird oil leak

I have a oil leak on my sb 350. It is a weird situation sometimes it looks like it leaks from the rear main then sometimes it looks like it leaks from the oil filter could this be a bad pan gasket? I have a moroso 6qt oil pan and have heard there are some problems with them leaking. I'm using just the plain cork and rubber gaskets for the pan would it be a good Idea to buy a one piece pan gasket. Also I've heard of putting the rear main seal in offset a little does this help?

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Old 10-12-2005, 02:25 PM
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Are you sure that it is not coming from above, say at the head, and then dripping at a certain spot depending on where the vehicle is parked.

I use all rubber gaskets I find that I can remove more than once and still re-use the gasket that way.
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Old 10-12-2005, 04:24 PM
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It could be from the back of the intake like I had. I have the oil pressure sensor on the back behind the intake. Mine leaks there and looks like a rear main.
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Old 10-12-2005, 04:59 PM
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Notorious for leaking at the rear of the intake,use Perma tex instead of the supplied rubber gaskets you get in the kits.They are JUNK.The fitting for your oilr presure line can also be leaking.Do you have one,and does it have that cheap plastic/nylon line?They can snap rather easily at the end of the compression fitting.There is also a boss that is drilled right above the oil filter housing,where factory located oil pressure sending unit were ported.The plug may not be fully tightened or may be in need of being thread sealed.Can you see the back edge of your valve cover? It could also leak there,at the lower edge,especially if the gasket slipped a bit during install.
I also have the cork oil pan gaskets,and on an occasion,have had to retorque them to stop a leak.I plan on installing a one piece rubber OP gasket this winter to stop that problem.
Mine does not leak enough to even hit the driveway,but it is a nuisance when you know about it.
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Old 10-15-2005, 07:40 PM
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Sometimes the oil pressure senders themselves will leak where the metal body is crimped over the plastic insert. The oil then drips down the back of the block, mimicking a rear seal leak.
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Old 10-15-2005, 08:29 PM
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In addition to what the other guys said (very good advice) Be sure your PCV system is good. You need a good crankcase filter in one valve cover and a PCV valve with full manifold Vacuum on the other cover. Unless of course you have some other kind of crank case evacuation system like exhaust pulling it out. A bad PCV system will cause leaks galore!
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