tanman722001
Not A Chevy Man
How big of a pain is it to change a rear main seal in a 400?Whats all involved?I know you have to drop the oil pan.But what else?I need to repalce mine badly.Thanks Tony
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Rear main seal
- Thread startertanman722001
- Start date
- Moderator
- #2
Not really that bad of a job you may have to loosen the motor mounts and raise the engine to get the pan to come off.
tanman722001
Not A Chevy Man
Even on a 4X4
- Moderator
- #4
Yep, I think I would be inclined to change the pan gasket as well at the same time for what it costs.
tanman722001
Not A Chevy Man
Do I need any special tool to put the rear main seal in?What do I need to take off after the pan?I was planning to replace the pan gasket while im at it.
LEB Ben
Arrogant A-hole At-Large
Post #3 from Randy:
http://www.fordtruckfanatics.com/forum/showthread.php?t=19040&highlight=rear+main
I use it as a reference for any I've ever done. As for the pan, I've never lifted the engine, but you have to worm it out just right. The dip stick tube likes to cause problems and the starter can get in the way.
http://www.fordtruckfanatics.com/forum/showthread.php?t=19040&highlight=rear+main
I use it as a reference for any I've ever done. As for the pan, I've never lifted the engine, but you have to worm it out just right. The dip stick tube likes to cause problems and the starter can get in the way.
- Moderator
- #7
I know on the 75 I had, the frame was such that the pan would come out without having to life the motor. If the frame is clear under the motor, then you can get it wiggled out for the mot part, at worst just lift the motor a little. You will need to take the rear main bearing cap off, as it holds half of the seal, the other half will have to be spun out of the block.
tanman722001
Not A Chevy Man
Any one know the torque spec for the main Cap?
LEB Ben
Arrogant A-hole At-Large
95-105lb IIRC...
tanman722001
Not A Chevy Man
in 3 stages
tanman722001
Not A Chevy Man
Should I replace the oil pump while I have the pan off?If so should I put a reg of high volumn pump?
LEB Ben
Arrogant A-hole At-Large
Oil pumps are one of those things that they're cheap enough to do while you're in there, so if it's getting up there in age...go for it. There are alot of misconceptions about oil pumps going bad and replacing one will be a miracle fix. The oil pump is the most highly lubricated item on the whole vehicle, chances are if it goes bad, something is wrong up or down stream. If you have oiling problems with a stock engine, an HV oil pump will only be a band aid that will be a short term fix for bearing failure elsewhere.
tanman722001
Not A Chevy Man
So a reg oil pump will be fine?
LEB Ben
Arrogant A-hole At-Large
Yessir.........
Agreed . HV pump may run itself dry on older engines if the drain ports that channel the oil back to the pan are partially clogged.
tanman722001
Not A Chevy Man
ok thanks guys
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