1 piece rear seal or 2 piece and why - Team Camaro Tech
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post #1 of 5 (permalink) Old Feb 14th, 08, 09:13 PM Thread Starter
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Levi
 
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Question 1 piece rear seal or 2 piece and why

I have no idea why the sell both of them still, I thought the two piece can sometimes be pushed out or leak over the easy and sturdier one piece what gives?
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post #2 of 5 (permalink) Old Feb 14th, 08, 10:13 PM
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Steve
 
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Re: 1 piece rear seal or 2 piece and why

The 2-piece is the first type used, and if installed correctly, should not leak.
Many of the leaks at the rear main are not a fault of the seal, but failure to seal the rear of the cap to the block.

If you are using a 2-piece, clock the parting-line about an hour around from the cap's parting-line. This will help it seal better. You'll still need to use a dab of RTV.

Also, a 2-piece seal can be replaced easier in the car with just the pan and cap removed. A 1-piece will also need the flexplate/flywheel and transmission removed to fit the seal over the crank.

2-piece seals are also a smaller diameter and therefore more compact.

1-piece seals tend to be more reliable which is why the switch, but like everything, they have their downside.

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post #3 of 5 (permalink) Old Feb 14th, 08, 10:57 PM
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Re: 1 piece rear seal or 2 piece and why

I believe they still sell both because you cannot choose between them
older engines only take 2 piece seals, new ones only use the one piece
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post #4 of 5 (permalink) Old Feb 15th, 08, 05:37 AM
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Re: 1 piece rear seal or 2 piece and why

Quote:
Originally Posted by 400bird View Post
I believe they still sell both because you cannot choose between them
older engines only take 2 piece seals, new ones only use the one piece
This is correct.

Pre '86 blocks will ONLY take a 2 peice seal.

'86 and newer blocks have an extra plate that bolts to the back of the block and holds the entire one peice seal, it no longer installs in the main cap. Crank flange is different too. These blocks can only take a 1 peice seal.





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post #5 of 5 (permalink) Old Feb 15th, 08, 07:14 AM
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Re: 1 piece rear seal or 2 piece and why

Quote:
Originally Posted by JimM View Post
Crank flange is different too.
And because of the effect of a smaller flange, a different flywheel/flexplate is needed compared to a 2-piece seal.

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