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FE Power Forums => Non-FE Discussion Forum => Topic started by: TJ on August 08, 2019, 08:57:50 AM

Title: Rear main seal material
Post by: TJ on August 08, 2019, 08:57:50 AM

Replacing the rear main seal in my 3.8L mustang.  I have a choice of rubber, viton, or teflon.  Anyone prefer one of these over the other?  Is the preference for ease of install, longevity, etc?  Thanks 

BTW, it's a once piece seal that rides the crank flange. 

Title: Re: Rear main seal material
Post by: blykins on August 08, 2019, 09:13:06 AM

Any will work. 

Viton seals are nice. 

Teflon seals go on dry.  They burnish themselves into the crankshaft to seal. 

Title: Re: Rear main seal material
Post by: Bolted to Floor on August 08, 2019, 12:38:47 PM

From dealing in the oil and gas industry, the Viton should hold up better to the oil.

Title: Re: Rear main seal material
Post by: RustyCrankshaft on August 08, 2019, 05:57:00 PM

Viton. Lasts longer than rubber, more durable than teflon in a lip seal configuration.

Title: Re: Rear main seal material
Post by: TJ on August 09, 2019, 08:10:06 AM

Thanks to all for the info.  I'll try a viton.

I read somewhere about Teflon needing to be installed dry on a dry shaft.  I might try that someday on a seal that doesn't take so much effort to inspect.