Reproduction Parts for 1916-1964 Chevrolet Passenger Cars & 1918-1987 Chevrolet & GMC Trucks
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1941 216 Chevy Master Deluxe.
Over the winter my sons and I replaced the rear main seal, oil pan gasket, clutch etc. Saturday fired it up for the first time since last October. In under 30 seconds it fired with 1/2 choke just like always, sounded smooth, smiles everywhere, and then it gushed oil from between the crank and the flywheel. Oil was coming out fast. Ran it for less than 30 seconds and shut it all down. Started it a second time to verify where it was coming from and it is from the rear of the motor.
Our gut feeling is we did not install the rear main seal correctly, are there any other possibilities? We have not yet opened anything up as we needed to walk away for a bit due to disappointment. What would your next steps be? We are hoping there is a way to avoid removing the transmission and everything again.
Hilton, New York
1941 Chevrolet Master Deluxe
1987 Monte Carlo LS
2001 Chrysler Sebring Convertible
Tim, If it’s not the pan gasket, which I doubt, I’d try the method described in the attached discussion from the old forum. Notice the recommendation to repack/compress the upper half of the existing seal further into the block and then fill the voids with pieces from the bottom half. A new seal is then used in the main cap. Also note how critical the main bearing clearance is. You should be able to accomplish both by removing the oil pan. Be careful not to score any metal surfaces. Hope it works for you and the boys
The forum thread also mentions cutting oil reliefs in the lower bearing insert which I have never done.
https://vccachat.org/ubbthreads.php/topics/314748/1948-rear-main-seal.html
See my other post on a possible plug of the crankcase vent by a critter. Pressure in the crankcase will quickly push oil out even if the seal is installed correctly. Stuck or collapsed rings are a possible source of high gas blow-by to quickly generate the pressure.
How sweet the roar of a Chevy four
Participant on Chatter since 11/22/2001
19758 posts on the former Chatter site
See my other post on a possible plug of the crankcase vent by a critter. Pressure in the crankcase will quickly push oil out even if the seal is installed correctly. Stuck or collapsed rings are a possible source of high gas blow-by to quickly generate the pressure.
Other than the overdraft tube and the two slits in the valve cover where are the other vents on a 216? Sounds like a quick thing to check. Sorry if this sounds like a dumb question, The crank case ventilation system I normally worked on was the type with a PCV valve similar to the one on my 87 Monte Carlo.
Hilton, New York
1941 Chevrolet Master Deluxe
1987 Monte Carlo LS
2001 Chrysler Sebring Convertible
Thanks for that re-packing method. I think if there is nothing blocking a link that is the way we will go. Sunday we ordered all the seals so it is something to try when they get here.
Hilton, New York
1941 Chevrolet Master Deluxe
1987 Monte Carlo LS
2001 Chrysler Sebring Convertible
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