360 Rear main seal problems?
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New User
Joined: Jul 2004
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360 Rear main seal problems?
I replaced the rear main today in a 1976 250 4wd , but still leaks like a open gasket, Two piece rubber seal, and side bars.
The crank looked good, is this a problem with the 360, i have always had a 351M or 400.
Any ideas will be helpfull.
The crank looked good, is this a problem with the 360, i have always had a 351M or 400.
Any ideas will be helpfull.
New User
Joined: Jul 2004
Posts: 2
Likes: 0
I have a 1976 F-150 2wd with a 360 C-6 tranny. I rebuilt it in 1989. I have not had any problems with the rear main leaking. I would suggest off setting the seal havles
about a quarter to three eights of an inch when installing the rear main. That is what i
did to mine.
about a quarter to three eights of an inch when installing the rear main. That is what i
did to mine.
Postmaster
Joined: Apr 2002
Posts: 3,613
Likes: 6
From: Coal country
Are you sure it is the rear main seal?
The FE series of engines (352,360,390 etc) are notorious for leaking from the rear of the intake manifold. Thye look like rear seal leaks because the oil makes its way down inside or the back of the bell housing.
The correct fix is to replace the manifold gaskets and RTV them well.
A temporary fix which has worked for me is steam clean the back of the motor well, and then little by little force RTV into the seam between the manifold and the block and head.
Did it 5 years ago, and it still doesn't leak.
The FE series of engines (352,360,390 etc) are notorious for leaking from the rear of the intake manifold. Thye look like rear seal leaks because the oil makes its way down inside or the back of the bell housing.
The correct fix is to replace the manifold gaskets and RTV them well.
A temporary fix which has worked for me is steam clean the back of the motor well, and then little by little force RTV into the seam between the manifold and the block and head.
Did it 5 years ago, and it still doesn't leak.
Freshman User
Joined: Sep 2004
Posts: 34
Likes: 0
From: Sacramento, CA
Lips Front
Make sure both neoprene Lip-Seal edges face the front of the engine. Offset the seals by at least 3/8 to 7/16 of an inch in the cap & block...RTV the seal butt ends.
Also, if you pulled out a rope seal and drove out the holding pin....make darn sure you RTV up the hole. Man...I missed this on my Cleveland and what a mess that was.
Also, if you pulled out a rope seal and drove out the holding pin....make darn sure you RTV up the hole. Man...I missed this on my Cleveland and what a mess that was.
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