Oil leak
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Junior User
Joined: Jun 2007
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Oil leak
Im installed a 351w in a 86 f250. I replaced the oil pan because of a rust issue. This motor has been sitting for a few years inside. The problem I have is this. When installing the oil pan&gasget I took my time to make sure I did it right. The gasget was a cork sided and rubber half circles for the ends. My ford manual sugessted putting the gaskrts on the block side with sealant at the joints, and small amounts on the gasgets to help hold to the block. I did use a thin coating on the rounded edges of pan. Everything went smooyh with no movement of the gasgets. I HAVE A OIL LEAK NOW. The leak only seems to ucour with the motor is running, or after I shut it off. The leak seems to be coming from the rubber seal area. When running, and under the vehicle it looks to me that abuot 4 oclock area lookink towards the rear of the truck, the oil slowly forms a drop between the pan-seal area and the flex plate,then runs down the flex plate,tothe lower transmission housing. The big question is this isit leaking from the pan or could the rear main be the problem? the motor has been sitting for a few years. Any feedback would be helpful. right now im gonna start pulling the motor
FTE Legend
Joined: Jun 2006
Posts: 31,930
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From: Ottawa, Ontario
Sounds like a rear seal.. sucks that you just put the motor in. For future reference the 1 piece steel core rubber coated pan and rocker cover gaskets are the only ones to use, they hold more TQ and will never leak unless the bolts fall out.
I'll add... Apparently it is possible to chage the rear seal without stripping the motor or removing the pan, use something to pry the old one out and a mallet to insert the new one.
I'll add... Apparently it is possible to chage the rear seal without stripping the motor or removing the pan, use something to pry the old one out and a mallet to insert the new one.
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Junior User
Joined: Jun 2007
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oil leak
I went cheap on the gasget set the cork and rubber, Ihave changed the rear main seal on a 351m once in the truck,and had success, but I also have a flywheel- starter noise so I think ist gonna be split any way Thanks for the reply
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