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

front and rear seal leaking..

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Old Nov 24, 2010 | 09:16 PM
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Default front and rear seal leaking..

94, 6spd. I decided not to take the motor out but its just the block sitting in the bay. Is the job of replacing front and rear seals easy? or is it more involved?
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Old Nov 24, 2010 | 09:23 PM
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Its somewhat involved being that you will have to remove either the engine or tranny to get to the rear seal. It goes around the rear of the crank and the flywheel has to be removed to get to it. The only disadvantage of the 1pc rear seal
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Old Nov 25, 2010 | 12:50 AM
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Originally Posted by derekguzz
94, 6spd. I decided not to take the motor out but its just the block sitting in the bay. Is the job of replacing front and rear seals easy? or is it more involved?
It actually might be quicker and less frustrating to pull the block and do the seals with it out of the car. Also, less chance of screwing the job up.
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Old Nov 25, 2010 | 08:58 AM
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Your that far just pull it and replace all the seals on a engine stand, Then you could pressure wash the enging compartment and clean everything properly.
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Old Nov 25, 2010 | 11:46 AM
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good idea. I didn't want to pull it but I am only a couple bolts away
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Old Nov 25, 2010 | 11:47 AM
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I know I have to take the timing cover off to get to the front seal but do I have to take out the crank shaft to do the rear? I am unaware of the location of the rear seal.
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Old Nov 25, 2010 | 12:24 PM
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It will be much easier to replace the crank seals with the block out of the car. If you don't have an engine stand. buy a Harbor Freight stand or rent one. If the crank is still in the block and it still has the balancer on, that has to come off and it will be much easier to do working at a comfortable position.

The rear crankshaft seal sits behind a retainer which has to be removed to replace the seal. There is also a gasket between the retainer and the block.
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Old Nov 25, 2010 | 02:14 PM
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Not sure how many miles is on the motor,but you might check the rod and crank bearings for excessive play. Most times there is a reason for leaking seals. My 94 had 120k and it had bad rod bearings. I know most motors last a lot longer though. Just my twos cents.
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Old Nov 25, 2010 | 02:24 PM
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187k
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Old Nov 26, 2010 | 10:24 AM
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Originally Posted by derekguzz
187k
If you plan on keeping the car, this might be the time to freshen up the engine.
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Old Nov 26, 2010 | 10:35 AM
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Jut pull it out, ditto on what sailorsteve said
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Old Nov 26, 2010 | 10:41 AM
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Originally Posted by derekguzz
I know I have to take the timing cover off to get to the front seal
Not true.
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Old Nov 26, 2010 | 10:48 AM
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Default Rear Seal

Pic courtesy of PeteK.


Last edited by STL94LT1; Nov 26, 2010 at 10:50 AM.
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Old Nov 26, 2010 | 12:31 PM
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Thank you for the pic and the replys
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Old Nov 26, 2010 | 01:57 PM
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Default Water pump and opti seal replacement

The opti seal on your 94 will be about the size of the water pump seal.

http://www.impalasuperstore.com/nais...TOPIC_ID=30984
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Old Nov 26, 2010 | 02:04 PM
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Default Crankshaft seal

Post #11.

http://forums.corvetteforum.com/c4-t...b-removal.html
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