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View Full Version : Possible Leaking Rear Main Seal 351 W



ccrunnergb
10-03-2009, 08:44 AM
Hi Guys,

Well I just bought a 67 with a 351 W and I have developed an oil leak. I have been trying to look around the forums about the rear main seal and I wanted some of your opinions. The car leaks oil while running and also while sitting in the garage. The oil puddle is 3-4 inches in diameter after one night in the garage. The attached picture shows the majority of the oil leak. I am not sure but if the rear main seal was leaking would there be oil all over the back of the oil pan. My thinking was the ring gear was spraying the oil everywhere but I wasn't sure. I know the valve covers are not leaking and I think the heads are not leaking. The next questions is I was told when I bought the car it was a 69 block so that means I have a 2 piece main seal unless this was changed when the engine was rebuilt. If I try to replace this can I do it in my garage with some jack stands? I am under the impression I have to remove the tranny and oil pan but can you install the seal while still under the car.

Just to confirm if I pull the oil pan, is there a way to tell if the issue is for sure the rear main seal or if it was the oil pan maybe? I really dont want to put a new oil pan gasket on just to take the pan off again.

Has anyone had similar problems before?
http://www.buckeyestangs.com/vb/C:\Documents and Settings\Greg Blough\My Documents\My Pictures\1967 Mustang\oil leak\P1010143-2

ccrunnergb
10-03-2009, 08:47 AM
Picture attached

LX2NV
10-03-2009, 09:25 PM
its typical with sbf's. time for a new rear main. the crank might possibly be grooved where the seal rides, take a fine solid wire or you fingernail and feel the surface of the crank for a knick or groove. if anything catches, or you can feel anything, you'll need a crank saver with the approiate seal at the very least. you must seal the flywheel/flexplate bolts too ... many fail to do this.

the oil pan, intake, or valve cover gaskets could be contributing to the mess as well.