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Rear Main Seal: Pre-Lubricate or install dry? #5247079 10/22/19 12:38 PM
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WondrousBread Offline OP
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Finally got a new rear main seal for my Celica, since I originally was shipped the wrong part and had to replace. Ended up getting a Fel-Pro seal.

Just wondering, since I can't seem to find it anywhere in the service manual, should the rear main seal be pre-lubricated before installing?

Re: Rear Main Seal: Pre-Lubricate or install dry? [Re: WondrousBread] #5247103 10/22/19 12:59 PM
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Silverado12 Offline
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I always grease the seals before I install them. Works for me.


12 Chevy Silverado ext. cab LS, 2WD 4.3 auto
18 Mustang GT 5.0 auto
07 Harley Dyna Street Bob 96 c.i. 6 sp.
00 Mustang GT auto
Re: Rear Main Seal: Pre-Lubricate or install dry? [Re: WondrousBread] #5247110 10/22/19 01:06 PM
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kschachn Offline
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Yes, the new one I got from Honda for my Accord already had grease in the groove.


1994 BMW 530i, 250K
1996 Honda Accord, 280K
1999 Toyota Sienna, 425K
2000 Toyota ECHO, 284K
Re: Rear Main Seal: Pre-Lubricate or install dry? [Re: WondrousBread] #5247114 10/22/19 01:12 PM
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NoNameJoe Offline
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Read the manual that comes with the part. The service manual cannot give you guidance on this.

There are some rear main seals that are not meant to be lubricated (the PTFE ones for example), lubricating those will result in early failure, you do not want to repeat this job.

https://webcache.googleusercontent.com/search?q=cache:Cka0FzgFOTEJ:https://www.fmmotorparts.com/garage-gurus/tech-tips/ptfe-rear-main-seal-installation-tip.html+&cd=17&hl=en&ct=clnk&gl=us

Also here's a PDF from VR that has a bunch of steps for their PTFE seals (that are usually the same steps for all PTFE). Note that you don't lubricate and you remove them from their tube/holder only before installation.
https://www.victorreinz.com/functio...ebe7443f55a7e3a00e1002a4a10797e0cc4d0099

Quote
Damaged PTFE Sealing Lip

The most frequent cause for failure is damage to the PTFE sealing lip during assembly. If the seal is installed without the help of a sleeve or special tool, and is shifted or even turned inside out, reliable sealing will hardly be possible.

Similarly, the use of oil or grease – as with classical oil sealing rings – will result in total failure of the PTFE oil seal immediately after installation.



2015 Civic LX Coupe
Re: Rear Main Seal: Pre-Lubricate or install dry? [Re: WondrousBread] #5247212 10/22/19 02:37 PM
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Miller88 Offline
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When I did the one on my Jeep 4.0 , it said specifically to NOT oil the seal and to use dishsoap.


18 Forester 2.5I 6M
00 Jeep XJ
01 F-350 4x4 5M
Re: Rear Main Seal: Pre-Lubricate or install dry? [Re: WondrousBread] #5247252 10/22/19 03:23 PM
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WondrousBread Offline OP
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So I installed it with some motor oil to help it slip in, seemed okay.

Fel-Pro didn't provide any instructions at all. What I can say is it definitely looks like Viton or similar, not PTFE

Re: Rear Main Seal: Pre-Lubricate or install dry? [Re: WondrousBread] #5247265 10/22/19 03:33 PM
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spasm3 Offline
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I always lube them. My assembly lube for rings, cylinder walls and seals like this is a mix of motor oil sometimes hedo and 50% sheaffers #132.


13 elantra 78k 5w30 synpwr
03 chevy avalanche 83k synpwr 5w30
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Re: Rear Main Seal: Pre-Lubricate or install dry? [Re: WondrousBread] #5247310 10/22/19 04:17 PM
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DGXR Offline
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I never install dry seals. They always get grease, oil, silicone (for o-rings), or some other kind of lubricant.


1995 Corvette coupe LT1 6-speed
2006 Tacoma 2.7 Base SR5 AC
1999 Yamaha YZ400FL
2003 Honda XR400R
Re: Rear Main Seal: Pre-Lubricate or install dry? [Re: WondrousBread] #5247331 10/22/19 04:36 PM
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Chris142 Online Content
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If its an old school rubber type of seal those normally get oil. The Teflon ones go on dry.


02 Wrangler Napa high milage 10w40
87 F250 Valvoline 15w40
07 fjcruiser Car lube plus 10w30
Z400 castrol T 10w40
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Re: Rear Main Seal: Pre-Lubricate or install dry? [Re: WondrousBread] #5247352 10/22/19 04:59 PM
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nobb Offline
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Old school rubber looking (Viton/EPDM) seals are designed to lose a very small amount of oil over time. It definitely helps to add some lube to these when installing.

PTFE seals should only be installed dry. When in operation, these seals self lubricate and wear themselves in to accommodate the minor imperfections of the associated sealing surface.

Re: Rear Main Seal: Pre-Lubricate or install dry? [Re: WondrousBread] #5247359 10/22/19 05:03 PM
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nthach Offline
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Read the service manual and any literature that comes with the part. I never installed a rear main, but Toyota does say use multi-purpose grease on the lip of the seal before installing. Some of the Fel-Pro ones are to be installed dry and not to be removed from the packaging sleeve which doubles as the sleeve to install the seal. You remove it once the seal is on the crankshaft.

Last edited by nthach; 10/22/19 05:07 PM.
Re: Rear Main Seal: Pre-Lubricate or install dry? [Re: WondrousBread] #5247633 10/22/19 10:28 PM
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clinebarger Offline
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As others have stated.....PTFE goes on dry!!

I've seen many misdiagnosed rear main seals, If it has any kind of adaptor/seal carrier.....Reseal it as well!!


2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/U341E
2000 Toyota Avalon 1MZ-FE/A541E
Re: Rear Main Seal: Pre-Lubricate or install dry? [Re: WondrousBread] #5247675 10/23/19 12:42 AM
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mehullica Offline
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Lube the side that touches the crank only

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