Hi to everyone
I have a friend that his car is leaking oil from the rear main seal. We dropped the pan & switched the seal . After everything went back togther the rear main was still leaking from the seal. I notice that there's a alignment dowel on the block for the one piece to two piece rear main seal adapter . Is it possible that the alignment hole on the adapter is off by a little bit causing the seal to be pulled over to far?The wear on the original seal is on the lower half of the seal. The top of the seal had no wear on it at all (looks brand new) . Any one had this problem before? Were stumped
njdaewoo

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86 Tramaro 90% Trans Am/ 10% IROC/Z (nose, hood,& fenders)
Trans Am Mods as of 1/10/01
3inch
T.E.S/Flowmaster setup,gutted cat,gutted maf,relocated mat,373 gears,upgraded factory chip,255 lph walpro f/pump & throttle body coolant bypass
njdaewoo@excite.com
New mods as of 6/10/01:
383sb engine
Comp Cam Xteme XR264hr-12
smog pump by-pass

 

more than likely, you need to put a wear ring on the rear of the crank. after time, believe it or not, the rubber seal makes a groove in the crank, the wear ring is a thin piece of metal that goes over the rear of the crank, and gives the seal a new smooth surface to seal against, we use them all the time at the shop but normally for the harmonic balancer. hope this helps

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Wide Open Till You See God...Then Brake

 

i re read your post. you have a two to one piece rear adapter? did i read that right?

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Wide Open Till You See God...Then Brake

 

My partner has a 87 350 roller block with a 400 crank. The crank is the older style 2 piece rear main seal type. So when using this crank in the newer style blocks u have to buy the 2 piece adapter seal. When we change the old seal & bolted the two halves of the adapter together on the crank there is a noticable small gap between the crank & the sealing lip of the bottom half seal.The crank shaft does not have a wear line. Are there different sizes in the rear main seal that a person could go to the parts store & ask for?

 

What,
This never happen to anyone? No knoledge on different size rear main seals?? Oversize-----------Undersize-------------seals for undercut cranks???
njdaewoo