rear main
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New User
Joined: Sep 2002
Posts: 7
Likes: 0
From: san antoio
rear main
i have an 84 ford f250 6.9 diesel. i have changed the rear main about 3 times. it stops leaking for about a month. so i put new rods mains and crankshaft and new rear main. it did the same thing. any suggestions anyone
Moderator
Joined: Jan 2001
Posts: 56,995
Likes: 2,741
From: Virginia
rear main
You might go up and ask the guys in the diesel forum. I don't know much about diesels, but I know in a gas engine, there are leaks that can look like a rear main, such as a rear mounted oil sending unit, rear intake gasket, rear oil galley plug leaking, and sometimes a valve cover gasket is mistaken for a rear main leak.
Senior User
Joined: May 2002
Posts: 484
Likes: 1
From: Garden Grove USA
rear main
I too don't know much about deisels, but on a gas engine I have found that a clogged PCV valve in the valve cover will actually build up enough crankcase pressure to push oil out the rear main seal.
Changing the PCV valve and not the rear main seal can eliminate a big rear main seal leak.
Worth checking out.
Changing the PCV valve and not the rear main seal can eliminate a big rear main seal leak.
Worth checking out.
