replacing rear main seal
- Thread starter jtb19nh
- Start date
The easiest way I've found to get the old one out is to thread a couple screws into it, and pull the screws with pliers to yank it out. Over time, contamination in the oil can wear the crank down around the seal, so there's always a chance the new seal will leak. I've never used any RTV on a rear main seal.
The RTV would go on the outside of the seal (the metal edge) that slides into the block.
If your old seal vulcanized and cut the crank, you can sleeve the crank. A teflon RMS is a cool way to go too, but they can be a pain to install.
And lastly, if your PCV/crankcase ventillation isnt up to par, that can cause an otherwise healthy RMS to leak. Folks have replaced the RMS to still have issues, which were traced back to the PCV.
You might want to replace the pilot bearing too.
Good luck.
If your old seal vulcanized and cut the crank, you can sleeve the crank. A teflon RMS is a cool way to go too, but they can be a pain to install.
And lastly, if your PCV/crankcase ventillation isnt up to par, that can cause an otherwise healthy RMS to leak. Folks have replaced the RMS to still have issues, which were traced back to the PCV.
You might want to replace the pilot bearing too.
Good luck.
mo_dingo
20+ Year Stangneter 
A friend and I drilled a 1/8 hole in the metal body of the seal, then threaded a sheet-metal screw into the hole. Then attached vise-grips to the screw and used a prybar against the visegrips and engine and it came out like buttah baby!!!
Scott
Scott
NotQuik
Founding Member
parchisi
New Member
As far as putting it back in, just use a seal installer...its a round cup with which you use a hammer to tap it into place evenly.
Along the same lines, my rear main seal leaks, but it only leaks while running and right afterwards, but if it sits for a while, the leak stops. Could this mean a problem with my PCV system or perhaps too much blowby?
Along the same lines, my rear main seal leaks, but it only leaks while running and right afterwards, but if it sits for a while, the leak stops. Could this mean a problem with my PCV system or perhaps too much blowby?
parchisi
New Member
Just adding my two cents to some previous posts ...
Using RTV on a rear main seal is never a good idea. If you need to seal the leak using RTV its time to look into what's causing the leak to begin with.
PCVs aren't (usually) the culprit for rear main leaks, though it never hurts to have a clean PCV in your pony.
Using RTV on a rear main seal is never a good idea. If you need to seal the leak using RTV its time to look into what's causing the leak to begin with.
PCVs aren't (usually) the culprit for rear main leaks, though it never hurts to have a clean PCV in your pony.
NotQuik
Founding Member
just did my rear main and it was quite simple....find out later this week wether it leaks or not....I'll finally have a 5 speed w00t!! 
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