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Old 01-04-2009, 02:15 PM   #1 (permalink)
Mitco39
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Rear Main Seal Leak?

Recently it got pretty cold up here in canada and one morning I had to start and use the truck. It started up and ran fine all that day without anything out of the ordinary... However the next day I noticed a nice big pool of oil right underneath the rear part of the engine. When I went to start the truck it started dripping almost instantly and even got to the point where it was no longer dripping and there was just a stream of it running down and dripping into the snow. Shortly after starting the truck the check oil level light went on so I turned the truck off.

I found it funny how all of a sudden it would seem that it just blew out the rear seal so after pulling out the service manual for the truck I suspected the culprit to be the breather system on the engine... After following the breather lines down the right side of the engine I found the oil seperation box. There was the one line comming in from the valve covers on the top and 2 more comming up from the bottom (one from the crankcase itself and another was the open)... As it turns out both of these hoses were plugged with ice.

So what im guessing happened was the buildup of pressure popped the rear seal, and now im left with a nice big leak.

What im asking is if there is anyway to see the rear main seal looking up through the bell housing? If the seal just got pushed out (unlikely however I wanna make sure that there is not a easy fix before I spend 1000 bucks on it)?

So for now Ive had no other choice but to drive it as it is and just keep a eye on the oil level... it doesnt seem to leak nearly as fast when its not idling...


Thanks

Mitch
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Old 01-04-2009, 05:33 PM   #2 (permalink)
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Mitch try using the search feature. I was searching last week on the same topic to find what info I could their was a TSB on your problem.
I thought my rear main was leaking also, But it ended up being a turbo line.
I think you need to search under clogged/ frozen pcv valve.
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Old 01-04-2009, 05:55 PM   #3 (permalink)
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Thanks... and sorry for not searching prior to making a thread...

I read that thread that you said to and thats exactly what happened... I had removed all that and thawed it out... but the oil leak continued, so unless there is another breather line I overlooked... I guess the oil seal needs to be changed. I would have just thought that once you took the pressure out of the crankcase the oil should have stopped leaking as fast...


As for the turbo line you said you found to be leaking how did you see it? I crawled up ontop of the engine and removed the turbo sheild, everything looked pretty dry and i even managed to find a dead mouse hiding ontop of the engine.. lol. But as for a oil leak the top part of the engine was dry and i couldnt find any oil when i reached down around the turbo and felt around...
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Old 01-04-2009, 07:52 PM   #4 (permalink)
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You might see better getting underneath the truck, taking a flashlight and looking up through/next to bellhousing. You can see the underside of turbo, pipes, and feed line better.
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Old 01-04-2009, 11:07 PM   #5 (permalink)
Mitco39
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I tried a best as i could without getting a face full of oil... I found someone who could change out the seal for 350 bucks... so Im going to go that route and do that modification to the oil seperator box... If you have a 01-03 LB7 I strongly suggest doing the easy mod to save you the big $$ needed to replace the seal...

Thanks for the help again...
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Old 01-04-2009, 11:12 PM   #6 (permalink)
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fill out your sig so we know what your truck is...
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Old 01-04-2009, 11:59 PM   #7 (permalink)
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i hope you get good work for the 350 it is not a easy job and that sounds way to cheep
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Old 01-05-2009, 12:27 AM   #8 (permalink)
Mitco39
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My father-in-law is the manager of a autobody and repair shop... and he asked one of his workers if they wanted something to do on the side... He wouldnt be working for him if he wasnt good at what he did...so we shall see.

I also have a buddy who is a manager of a transmission shop and the best he could do was 750 with a tranny tune up... which is also a very good deal considering most other places wont touch it for under a grand..

Ill update the sig right now...
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