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Old 01-28-2011, 09:39 PM
justanothercummins justanothercummins is offline
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Default cummins rear main seal replacement

So, once the trans is out of the truck, how hard is it to replace the rear main seal on my Cummins?

I have a little bit of a leak that I believe is the rear main and need to get it taken care of once I get the trans out for a rebuild.

Is there anything else on the backside that is really common for leaking oil? headgasket?

I am not leaking a ton of oil by any means, but plan on switching over to synthetic shortly, and don't want a stream of oil coming out from under my truck.

Any help is appreciated!

Last edited by stodg73; 09-15-2012 at 09:49 AM.
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Old 01-28-2011, 10:42 PM
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MnTom MnTom is offline
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From what I have read it is not a real hard job. THIS will give you lots of info along with pictures!
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Old 01-31-2011, 09:17 PM
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heavyd1980 heavyd1980 is offline
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it is very simple to replace the rear main seal. I replaced mine when i had to replace the tone ring! i went to o'rielly auto parts and bought a rear main seal kit and just removed the housing and replaced the gasket and the seal. the seal just taps out with a seal/bushing installer or a simple piece of flat steel and then just tap the new seal into the housing. very simple once you go to re-install the seal and adapter then just use the plastic seal helper to slide it over the crankshaft and voila your done!!!
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Old 01-31-2011, 09:33 PM
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Quote:
Originally Posted by heavyd1980 View Post
it is very simple to replace the rear main seal. I replaced mine when i had to replace the tone ring! i went to o'rielly auto parts and bought a rear main seal kit and just removed the housing and replaced the gasket and the seal. the seal just taps out with a seal/bushing installer or a simple piece of flat steel and then just tap the new seal into the housing. very simple once you go to re-install the seal and adapter then just use the plastic seal helper to slide it over the crankshaft and voila your done!!!
Thank you! Nice to have an experienced person tell us how it is done!
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Duct Tape can't fix stupid, BUT it can muffle the sound
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Old 01-31-2011, 09:40 PM
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heavyd1980 heavyd1980 is offline
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well its one of the few things i have done with these trucks!
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Old 02-24-2011, 11:36 PM
rhagfo rhagfo is offline
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Quote:
Originally Posted by heavyd1980 View Post
it is very simple to replace the rear main seal. I replaced mine when i had to replace the tone ring! i went to o'rielly auto parts and bought a rear main seal kit and just removed the housing and replaced the gasket and the seal. the seal just taps out with a seal/bushing installer or a simple piece of flat steel and then just tap the new seal into the housing. very simple once you go to re-install the seal and adapter then just use the plastic seal helper to slide it over the crankshaft and voila your done!!!
If I need to replace my rear main, I think I would go to the local Cummins dealer and buy a Cummins seal kit, Yes, it is going to be $$ more, but it was designed to last a long time.
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Last edited by stodg73; 09-15-2012 at 09:50 AM.
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