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rear main seal on 235
#1376485 Wed Sep 09 2020 01:46 PM
Joined: Aug 2016
Posts: 80
B
Shop Shark
When replacing the rear main seal is it better to go with the original rope style or the newer neoprene (rubber) style on a 235 engine? Can anyone recommend a specific product?

Re: rear main seal on 235
bucktruck #1376528 Wed Sep 09 2020 07:27 PM
Joined: Mar 2011
Posts: 102
S
Shop Shark
I used the newer rubber on my 59 235 no leaks. Good luck.

Re: rear main seal on 235
bucktruck #1376535 Wed Sep 09 2020 08:10 PM
Joined: Feb 2004
Posts: 21,049
H
Boltergeist
"Best Gasket" makes a rope seal that's the only one worth considering, and I believe they have recently introduced a lip seal that fits the 235/261 engines also.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: rear main seal on 235
bucktruck #1376565 Thu Sep 10 2020 12:41 AM
Joined: Sep 2001
Posts: 30,478
ace skiver


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engines are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
Re: rear main seal on 235
bucktruck #1376567 Thu Sep 10 2020 12:47 AM
Joined: Mar 2010
Posts: 9,446
5
Master Gabster
If the main bearings are of the shimmed variety, you need to use a rope seal. Its a little muddy as to when shims were no longer used in 235s. Somewhere beginning around '54-'55.

Re: rear main seal on 235
bucktruck #1376569 Thu Sep 10 2020 12:52 AM
Joined: Sep 2001
Posts: 30,478
ace skiver
If that is correct, probably/maybe 55-2nd and later?


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engines are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
Re: rear main seal on 235
bucktruck #1376571 Thu Sep 10 2020 01:27 AM
Joined: Dec 2017
Posts: 810
D
Shop Shark
The neoprene seal was introduced in 56. So 55 and earlier used a rope seal. You can use a rope seal in a 56 and up motor, but you cannot retrofit a neoprene seal to a 55 and earlier motor. The rear main cap is machined differently, deeper really, and the neoprene sinks into the cap on the earlier motors.


Mike
Re: rear main seal on 235
bucktruck #1376583 Thu Sep 10 2020 02:14 AM
Joined: Aug 2017
Posts: 484
S
Shop Shark
What Jerry said!
Best Gasket. Came with easy directions.
Did my 58' 235. Still NO leaks from almost 2 years ago.

Attached Files
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Re: rear main seal on 235
bucktruck #1376589 Thu Sep 10 2020 04:41 AM
Joined: Feb 2004
Posts: 21,049
H
Boltergeist
For as really permanent fix, have the block and rear main cap bored to fit a Chicago Rawhide #38647 full circle lip seal. That requires stripping the engine down to a bare block and setting it up in a Bridgeport mill, or using a fixture like I designed a couple of years ago that adapts a cylinder boring machine to the back of the engine block. Setup on the Bridgeport takes several hours, and is very expensive. With my fixture in place, I can be making cast iron chips in 30-45 minutes, and the whole process takes a bit over one hour to complete.

https://www.zoro.com/skf-shaft-seal-3-78x4-34x38-crwa1-nbr-38647/i/G9397674/

Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: rear main seal on 235
52Carl #1376593 Thu Sep 10 2020 10:45 AM
Joined: Aug 2016
Posts: 80
B
Shop Shark
Thanks, 235 in my truck is a 1959 model.


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