C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Rear Main Seal ?'s

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Old Mar 6, 2003 | 10:50 PM
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Default Rear Main Seal ?'s

Ok, here they go:
1) How hard is it to do this, I am leaking just a little oil onto the thin metal front flywheel cover plate, but there is none actually on the flywheel. (Note: I have the transmission and flywheel already off.)
2) Is Felpro (sp?) a good replacement brand (from Shucks)?
3) They make both a rubber and a teflon seal....which one?

TIA!
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Old Mar 6, 2003 | 11:18 PM
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Default Re: Rear Main Seal ?'s (USAsOnlyWay)

Ok, here they go:
1) How hard is it to do this, I am leaking just a little oil onto the thin metal front flywheel cover plate, but there is none actually on the flywheel. (Note: I have the transmission and flywheel already off.)
2) Is Felpro (sp?) a good replacement brand (from Shucks)?
3) They make both a rubber and a teflon seal....which one?

TIA!
On 1, what year car is it? My experience is with the 1-piece seals. They're easy to pull. What you need to do is take 2 short screws and screw them into the old seal. Then pull the seal out by pulling on the screws with pliers or vice-grips. Lube the new seal in oil and press it back in. It may be necessary to place a 2x4 over the seal and lightly tap the seal back in, just make sure the seal doesn't fold itself under when you do that.

On 2, Felpro is a great brand.

On 3, I use the stock replacement rubber seal.
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Old Mar 6, 2003 | 11:24 PM
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Default Re: Rear Main Seal ?'s (CorvetteZ51Racer)

Awesome, I have an 86 coupe, so I believe its a 1 piece? Thanks a ton! :flag
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Old Mar 6, 2003 | 11:25 PM
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Real simple. Pop the screws out of the seal housing and then pop the seal out on your workbench. Tap the new seal in evenly like Racer said. Then you'll want to smear some assembly lube all around the outside end of the crankshaft to help the new seal slide on evenly and smoothly.
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Old Mar 6, 2003 | 11:42 PM
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Default Re: (scorp508)

Thanks, OK I know this is completely off/topic but real quick, how do I get the pilot bearing in and out of there? (I know, probably a dumb question but figure better safe than sorry) TIA
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Old Mar 6, 2003 | 11:45 PM
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Well... there are different ways.

I use a slide hammer. It has little hooks that go in behind the bearing. Then you slide this handle along the shaft of the thing and the force pulls the bearing out.

Other people pack the bearing and end of the crank with something like vaseline or water soaked tissues. Then they hammer something round into the middle of the pilot bearing and the hydraulics force it out.
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Old Mar 6, 2003 | 11:51 PM
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Default Re: (scorp508)

Hmm, I think a guy at my office (really I do work at one even though I'm a youngin') was telling me something about option 2, said I could borrow the tool... looks like thats how its going. Thanks.
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Old Mar 6, 2003 | 11:54 PM
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Default Re: Rear Main Seal ?'s (USAsOnlyWay)

Didn't the go to the ONE PIECE rear main in 87?

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Old Mar 7, 2003 | 12:04 AM
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Default Re: Rear Main Seal ?'s (VetNutJim)

Um, I could be wrong but I think my 86 does have a one piecer, at least thats what it looks like and what my shop manual looks like...?
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Old Mar 7, 2003 | 02:51 AM
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Default Re: Rear Main Seal ?'s (VetNutJim)

Didn't the go to the ONE PIECE rear main in 87?
If memory serves, they changed the engine in mid-year '86. I know for a fact that early '86s have iron heads and late '86s have aluminums. I believe that the aluminum headed motors also had roller blocks and 1-piece rear seals.
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Old Mar 7, 2003 | 11:09 PM
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Default Re: Rear Main Seal ?'s (CorvetteZ51Racer)

86 blocks are the first year for 1 piece rear main seal, but are not roller blocks. 87 was the first year for roller blocks.
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