Teflon Rear Main Seal - Worth it??

blkcobra50 · Jul 28, 2006

Which rear main seal should I use on my 331. There were 2 that I found with a $25 difference. Teflon ($40) or the $15 replacment both by fel-pro.

tunedin302 · Jul 28, 2006

I went with the teflon upon the recommendation of a reputable engine builder.

89stangWhiz · Jul 28, 2006

where did you find a teflon seal?

R2D2 · Jul 28, 2006

Having built dozens and dozens of small fords over the last decade, I can safely say the run of the mill rear main has stood the test of time for me, in everything from 8 sec cars to 13 sec street rides.

blkcobra50 · Jul 28, 2006

89stangWhiz said:
where did you find a teflon seal?

Fel Pro Teflon RMS

DeVus1 · Jul 28, 2006

Fel Pro gaskets, imho, are the best out there. You really cant go wrong with either one.

HISSIN50 · Jul 28, 2006

AZ used to (and still might) sell the Teflon RMS's.

Darkwriter77 · Jul 29, 2006

Got my Teflon RMS at Autozone when I was doing my clutch swap. Hasn't leaked a drop since. If only I could say the same for the oil pan gasket...

Joey5.0 · Jul 31, 2006

I Accidently scratched the crank when installing my rear main seal, will it leak? And will the balance of the crank be off at all? its a Minor scratch but its pretty good.....

SCHOONER · Jul 11, 2009

A New Two (2) Piece Rear Main Seal Should NOT LEAK

HISSIN50 said:
AZ used to (and still might) sell the Teflon RMS's.

Hi Hissin50

I'm having my 289cid Mustang engine restored. Its been bored-out 000.30ths. My car restorer guy tell me that, " . . . you gota expect a little oil leak with those two new piece rear main seals that we're going to install."

Now if you will please:

Do I have to buy that

And what is a SLEEVE ?

And how if anything would it help a great deal in preventing a rear main seal LEAK

Thanks Guy
GOD BLESS

Schooner

Brian992V · Jul 11, 2009

Joey5.0 said:
I Accidently scratched the crank when installing my rear main seal, will it leak? And will the balance of the crank be off at all? its a Minor scratch but its pretty good.....

Depends on how bad the scratch is and where its located whether it will leak or not. U should be ok. The balance wont be affected.

Gearbanger 101 · Jul 11, 2009

One...interesting choice in font and font size
Two...you're having in bored .030...not 0.30.

5.0ina66 · Jul 11, 2009

SCHOONER said:
Hi Hissin50

I'm having my 289cid Mustang engine restored. Its been bored-out 000.30ths. My car restorer guy tell me that, " . . . you gota expect a little oil leak with those two new piece rear main seals that we're going to install."

Now if you will please:

Do I have to buy that

And what is a SLEEVE ?

And how if anything would it help a great deal in preventing a rear main seal LEAK

Thanks Guy
GOD BLESS

Schooner

You can't use a 1-piece RMS on an early block without doing the machine work to make the block and crank work with the 1-pc seal. Machine shop guy is full of "it" if he thinks that a 2-pc seal is supposed to leak when it's brand-new. Heck, I haven't had too many problems with OLD 2-pc seals.

Mustang5L5 · Jul 11, 2009

Autozone sells the Teflon gasket...and it's the way to go

SCHOONER · Jul 11, 2009

You're Right About The Numbers

Gearbanger 101 said:
One...interesting choice in font and font size
Two...you're having in bored .030...not 0.30.

Hey Gearbanger 101

Sorry about the numbers. I still can't count

But you're right its: .030 ! ! !

Now back to my new two (2) piece rear main seal.

I just can't buy the fact that my restorer guy is telling me that; about having to accept the rear main seal leaking.

I will talk with him (he's a nice guy and the men in his shop are some craftsmen) His engine mechanic seems to think that it will be O.K. and the seal won't leak.

If it does LEAK ~ HE FIXES IT
As far as I concern guys like yourself and the guys on this forum know what the heck they're talk about.

You guys have done the work

Thanks Again 4 your impute

GOD BLESS

Schooner

SCHOONER · Jul 11, 2009

TEFLON GASKET TO SEAL THE 2 PCS. SEAL

Mustang5L5 said:
Autozone sells the Teflon gasket...and it's the way to go

Hey Guy

I'm not an engine builder or mechanic. Just a guy who don't know that much about building engines

However, I've been a weldor for 17yrs. Whatever that's worth

All I want to know is:

Any you guys know 4 sure that a: New 2 piece rear main seal will NOT LEAK after installing it

Have any you guys done this work with the 289 engine and NOT HAVE THE REAR SEAL LEAK YES/NO

THANKS
GOD BLESS

Schooner

7upstang91 · Jul 12, 2009

You may have to order them from Autozone. I got mine from Napa for $25, the cheaper one was $15. Have the teflon in both stangs and no problem. If you are going to do 8 hours of work why not put the better on in?

1987stangman · Jul 12, 2009

Joey5.0 said:
I Accidently scratched the crank when installing my rear main seal, will it leak? And will the balance of the crank be off at all? its a Minor scratch but its pretty good.....

I used a teflon seal when I rebuilt my motor. Damn thing just started leaking a bit about a month ago so it is what it is.

If you have not buttoned up the thing yet use some fine grit emmory cloth to clean up the scratch u put in the crank.

Teflon Rear Main Seal - Worth it??

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