2.8 Rear Main Seal - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 03-29-2000, 09:29 AM
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2.8 Rear Main Seal

I have a 1983 S-10 Blazer with a 5-spd and the gutless 2.8L V6. The has features power stearing also. the truck has a substantial oil leak
(1 quart per 200 miles or so) from the rear or the oil pan as best I can tell. Does anyone have any experience
replacing the rear main seal in this vehicle. I've heard it is a real nightmare. any help will be apppreciated.

Mountain Man

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post #2 of (permalink) Old 03-29-2000, 12:07 PM
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Re: 2.8 Rear Main Seal

I belive that year of 2.8 has a one peice rear main. What this means is that you will have to remove the Trans to get to it. Yes its a pain in the butt. But if you can do it your self you will save a ton of money in labor cost because the seal is probably under $5. Check out a Haynes manual, it will give you step by step proceedures on how to repair this pain in the a$$ oil leak. Good Luck!

92 S-10 Blazer 4x4 Vortec 4.3
85 S-15 Pickup 4x4 2.5 iron duke
post #3 of (permalink) Old 03-29-2000, 12:34 PM
 
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Re: 2.8 Rear Main Seal

Just to add to what FredBear was saying. TORQUE SPECS ARE EVERYTHING.

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post #4 of (permalink) Old 03-29-2000, 08:44 PM
 
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Re: 2.8 Rear Main Seal

In '83 the 2.8 V6 used a rope seal. The one-piece seal wasn't designed/put into the engine until '85.
The '83 rope seal is a pain because part of the job requires compressing the seal with a special tool from GM(or equilvalent). Trying doing that on your back, in the driveway, with inadequate lighting, and the block(yes, the oil pan has to come off) dripping on you, your face, & any helpers you may have.

--Drew
83 S10 4x2
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post #5 of (permalink) Old 03-30-2000, 12:04 AM
 
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Re: 2.8 Rear Main Seal

Drew, you're not bitter, are you? [img]/wwwthreads_images/icons/laugh.gif[/img] [img]/wwwthreads_images/icons/wink.gif[/img]

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post #6 of (permalink) Old 03-30-2000, 02:02 AM
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Re: 2.8 Rear Main Seal

Ok, If its a 2 piece then I'm sure Felpro makes a neopreane one for it. That makes the job a little eaisier. Drop the oil pan, loosen the main caps, remove the rear main, push the upper half out, push the new upper in, stick the lowwer in the cap, tighten everything to specs, install oil pan, check for leaks. i think I may have made it sound allot eaisier than it realy is. No matter how you look at it, a rear main is a real pain!!!!!

92 S-10 Blazer 4x4 Vortec 4.3
85 S-15 Pickup 4x4 2.5 iron duke
post #7 of (permalink) Old 03-30-2000, 08:25 AM
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Re: 2.8 Rear Main Seal

I have an 85 s-10 blazer 4x4 that only leaks oil at high rpm (distributor???????) so i decided that if i change the dist. shaft seal and valve cover gaskets (also a leakin') and it still leaks, that im just going to change the engine. The motor just about has to come out to change the lower gaskets anyway. well thats just my view on that whole leaky mess!

Salamander
if you can't beat them, Get a bigger stick!

1985 S-10 Blazer


post #8 of (permalink) Old 03-30-2000, 11:02 AM
 
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Re: 2.8 Rear Main Seal

Nope. My friend did the repair, I just helped.[img]/wwwthreads_images/icons/wink.gif[/img] My engine doesn't do things like that to me because it's an '86[img]/wwwthreads_images/icons/smile.gif[/img](no fuel injection though).

--Drew
83 S10 4x2
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post #9 of (permalink) Old 03-30-2000, 11:15 AM
 
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Re: 2.8 Rear Main Seal

It is not a Two-piece Neoprene Seal like what was used on the later V8s. It is a true rope seal like that what was used on the really early V8s.
The Repair manual(Chiltons & Haynes) says that seal isn't removed, just compressed. It's kind of like having a glove, in a hole, stopping a leak. When the glove starts leaking again, you compress the first glove more & stuff another one into the hole. Thats basically how the repair manual says the rope seal is fixed.

--Drew
83 S10 4x2
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post #10 of (permalink) Old 03-30-2000, 04:42 PM
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Re: 2.8 Rear Main Seal

Before you do all that I would reccomend checking the intake
manifold in the back(very common) also the donut on the distributor
I thought mine was leaking,didn't look real hard, went in to do the clutch
and it was bone dry. mine is leaking at rocker covers,dist and intake(front
and rear). yours does have a rope seal, look and see if any of the parts
stores around you have a "Sneaky Pete" then all you need to do is drop the
pan.
Later

HAWG WILD
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