Having trouble pushing out the rear main oil seal from the block - Hot Rod Forum : Hotrodders Bulletin Board
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Old 04-16-2019, 10:08 AM
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Having trouble pushing out the rear main oil seal from the block

Folks, I am having problems removing the portion of the 2-piece real main seal that goes into the block. I have used a brass punch to try and loosen up and punch the seal out but the seal just lifted off the edge and would not push the remaing portion of the seal out the other side.
Any advice? Special tools, etc.?TIA

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Old 04-16-2019, 10:36 AM
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If you are trying to do this with the engine still in the vehicle chassis, you need to loosen all the main cap bolts and allow the entire crank to be pried down slightly away from seated in the block, to take any friction and pressure off the seal.
Once you've got it out and the new seal half in place, carefully snug up the bolts evenly for the #4 main cap to pull the crank back up into place, then reinstall the rear cap with the other new seal half and then re-torque the bolts on all five main caps.
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Old 04-16-2019, 10:48 AM
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so are you trying to rotate the seal out of the block while it is in the car with crank in or is the engine out with the crank removed ?
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Old 04-16-2019, 01:53 PM
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The engine is still in the vehicle.
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Old 04-16-2019, 01:58 PM
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Should have said that the engine- with crank installed -is still in the vehicle.
(Planned to loosen the crank bolts this evening to see if that helps in this particular case.)
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Old 04-16-2019, 03:42 PM
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What engine?
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Old 04-16-2019, 04:00 PM
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The engine is a 327/300HP from a 1967 Impala.
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Old 04-17-2019, 09:48 AM
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The last one of these I did was a 427 on a 69 Corvette. The rubber had bonded to the block material and it was not moving. I took an old dipstick and pushed it between the metal section of the seal and the block. I clamped vise grips on it and tapped it in, when I saw it start to poke out the other side I pulled it back and the seal came with it.

You have to keep the metal between the block and the metal portion of the seal so that you do not harm the crank.

Good luck.
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Old 04-18-2019, 10:48 AM
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Silver74vette, I owe you a couple of beers!
My seal had also bonded to the block material. Trying to use a brass punch just resulted in mashing up the end of the seal with no movement of the seal itself.
Did not have an old dipstick but took a brass 0.064 X 1/4" strip and filed down the width to match the width of the opening under the seal. Then filed a rough chisel point on the strip to help the seal separate from the block and tapped it in. The strip was about 4" long and strong enough to take the tapping without having to use the vice grips as a hold/ "hammer point".
Worked the strip in alternately from both sides and the seal came out while withdrawing the brass strip on the second pass.
As you suggested, it is necessary to keep the brass strip between the metal of the block and the seal so as not to damage the crank.
Thanks so much to you and the rest of the responders for all the help.
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Old 04-18-2019, 06:36 PM
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Great news! If you ever find yourself in coastal NC let me know. I'll always buy the first round.
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