How To Change Rear Main Seal On A Chevy 400 Motor

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Rear seal leak chevy 400! Ugghh.

• Thread starter BadAssMonte
• Start date Jul 13, 2010

• #i

• #2

Information technology may be the rear master seal leaking, less likely the pan is leaking. Past take chances were the main bearings caps align-honed? If so was the correct oversize rear main seal put in? This is an event on 400'south, I had to shim my rear main seal to get it to end leaking oil. Well, at least to slow information technology down.

• #three

Once a 400 is line honed, a stock rear main seal volition non work.
Shimming works (sometimes)
Fel pro makes the correct seal

• #iv

The cake was never lined honed, and this is the first fourth dimension I had a trouble with this. The last time I rebuilt this engine I put a new oem rear seal in information technology which worked just fine. I didn't off ready the gaps in the cap this fourth dimension either which could be the trouble. I promise that I can pull the pan without pulling the tranny and engine.

• #5

The cake was never lined honed, and this is the first time I had a problem with this. The last time I rebuilt this engine I put a new oem rear seal in information technology which worked just fine. I didn't off set the gaps in the cap this time either which could be the problem. I hope that I can pull the pan without pulling the tranny and engine.

Well to go the pan off you lot will have to heighten your engine a couple of inches. I accept really changed a a one piece oil pan seal that way. Y'all all the same need to take the hood off the machine to get the engine lift in at that place and raise it up..I used metal car ramps instead of jack stands. You volition finally get to utilise those blue plastic screws to hold up the oil pan gasket..Those ones that in in the box that people go what the hell are these for and throw them away...It volition be a expert three hr process...Be conscientious not to get whatsoever sealant in your pilus..

Jeff C.

• #half-dozen

I'll be working on it very presently here. Thanks guys.

• #7

Did you lot face up the seal in the correct direction? They are designed to pull oil in and if put in backwards push it out.

• #8

Yes I put the seal in correct. Come to observe out the valve cover was leaking out the dorsum all the fashion down to the middle of the crank and oil pan appearing to be the crank seal. Problem solved. Thankyou for all that responded. I jumped the gun because I was pissed to see information technology leaking.

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Source: https://nastyz28.com/threads/rear-seal-leak-chevy-400-ugghh.190223/

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