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Old 12-02-2003, 10:41 AM
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rear main seal in 350

I'm about to tackle a rear main seal in my 350 engine and just wandering what I'm about to encounter. I'm no certified mechanic by no means but like to work and figure out stuff on my own. And since I've got my tranny out (that problem is posted in the transmission forum http://www.hotrodders.com/t29177.html ) I figured I'd better do this while it is out.

So any tips on what I'm going to encounter behind that flexplate?

It's a one piece rear main seal. I got the replacement from Autozone and they had two choices: rubber or teflon. Both the same price so I went with the rubber replacement. What's the difference in the two?

All tips and suggestions are welcome.

Thanks

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Old 12-02-2003, 10:45 AM
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make sure it`s facing the right direction, and lube the hell out of it with vaseline or the like.
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Old 12-02-2003, 11:00 AM
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The rubber one you lube up wth oil and the teflon one is supposed to be installed dry.
On the rubber one the little coil spring holds the seal against the crank surface. The teflon seal gets installed dry as soon as crank starts turning a tiny amount transfers to crank surface and the two teflon surfaces ride against each other with ultra low friction.
Teflon seal is suppose to last longer and not wear a groove in crank after 100000 miles.
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Old 12-02-2003, 11:20 AM
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Nothing is as easy as it seems...

I guess my reason for posting is to ask a couple of questions:

First, how many miles are on the motor?

Second, how bad is it leaking?

One of the reasons a rear main seal could fail is if the motor has a bunch of miles on it and has some play in it. As the main bearings continue to wear from their original clearances, there becomes a little end play on either end of the crank. As the crank moves up and down, it bores out the seals and they begin to leak. If you replace the seal on a motor with a bunch of miles on it, it's just going to start to leak again. I guess the cheapest way you could do it is to drop the crank out, take it to a machine shop and have it checked or polished, but even then you run the risk of over-looking problems on the block journals.

Just my .02

K
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Old 12-02-2003, 12:57 PM
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Well the engine has a little over 184,000 miles on it. But it's not leaking. I'd just rather do a little preventive maintenance while the transmission is already out than have it start leaking on me in a couple months. Just trying to think ahead

Appreciate the input Greg, the guy behind the counter recommended the rubber one for some reason unknown. I guess he just picked and chose about like I would have.

And Doublevision, I may use some Pam cooking spray. So it won't stick or anything instead of Vasoline. Thanks for the idea.
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