rear main seal
10-07-2011, 09:46 AM
#1
rear main seal
I have a new clutch to install in my truck, so with 200k on it, I figure I should replace the rear main seal. I checked the service manual, and it says to put it in dry........is this correct? I've always put a little oil on seals when replacing them, although I've never done one in a Cummins.
As an aside, I've read in the past about a cooling system mod that installs on the back of the head. If it's going to be done, it seems it would be a good time to do it while the trans is out. Is that mod actually beneficial?
As an aside, I've read in the past about a cooling system mod that installs on the back of the head. If it's going to be done, it seems it would be a good time to do it while the trans is out. Is that mod actually beneficial?
10-07-2011, 06:14 PM
#2
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Follow the FSM directions. Make sure its clean in dry if you change it. Personally, if its not leaking, I'd leave it alone. It could go a long way without leaking. You may look into putting a speedi-sleeve in if your crank has a groove worn into it.
10-13-2011, 12:56 PM
#3
Thanks Tate.....just seemed odd not to lube it for the install, but I'll go with it. It is seeping a bit, and since I'll be in there anyway it seems like replacement is a good idea. FSM says if it's grooved, the seal can go in another 1/8", but if it's bad I'll sleeve it.
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