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PTFE rear main seal installed NOT dry #4734755 04/21/18 08:22 PM
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eyeofthetiger Offline OP
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I just put a new clutch in my '86 Ranger, because look at the old one:



It needed a new flywheel, and I replaced the rear main seal while I was at it. As usual, I discarded all of the instructions and installed the seal like normal, with a light film of grease so it doesn't get torn up while driving it in.

After I got the transmission bolted back up, I found a little piece of paper on the floor from FelPro. It said something like, "PTFE seal, do not lubricate, must be installed dry, I'm a FelPro seal, look at how special I am, PTFE 4LYFE, blah blah blah, etc."


This is the first time I've seen an oil seal that wants to be installed dry. So, how long will my greased seal last before it shreds into a million pieces and starts spraying oil everywhere?

Oh btw, I will be filling it with Maxlife 10W-40 and servicing the PCV valve, etc.

Last edited by eyeofthetiger; 04/21/18 08:24 PM.
Re: PTFE rear main seal installed NOT dry [Re: eyeofthetiger] #4734757 04/21/18 08:24 PM
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Imp4 Offline
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Seems like the difference between acting like an adult and, well, otherwise...


2001 Mitsubishi Galant 2.4 - 165k+
Grandma's creampuff...
Re: PTFE rear main seal installed NOT dry [Re: Imp4] #4734760 04/21/18 08:26 PM
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eyeofthetiger Offline OP
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Originally Posted By: Imp4
Seems like the difference between acting like an adult and, well, otherwise...


You lost me

Re: PTFE rear main seal installed NOT dry [Re: eyeofthetiger] #4734767 04/21/18 08:33 PM
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Kool1 Offline
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You would have got 1,000,000 miles leak free from the rear main seal. Because you greased the rear main seal, you will now only get 999,999 miles with no leaks from the rear main seal.

Re: PTFE rear main seal installed NOT dry [Re: Kool1] #4734774 04/21/18 08:37 PM
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eyeofthetiger Offline OP
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Originally Posted By: Kool1
You would have got 1,000,000 miles leak free from the rear main seal. Because you greased the rear main seal, you will now only get 999,999 miles with no leaks from the rear main seal.


My life is over. I am no longer a mechanic. I will be rolling my toolboxes out to the curb on trash day.

Re: PTFE rear main seal installed NOT dry [Re: eyeofthetiger] #4734775 04/21/18 08:38 PM
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Linctex Offline
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Originally Posted By: eyeofthetiger
After I got the transmission bolted back up, I found a little piece of paper on the floor from FelPro. It said something like, "PTFE seal, do not lubricate, must be installed dry, I'm a FelPro seal, look at how special I am, PTFE 4LYFE, blah blah blah, etc."

So, how long will my greased seal last before it shreds into a million pieces and starts spraying oil everywhere?


It will leak, though probably not too bad.

You can't remove it, clean it and reinstall it... it's already ruined, so just drive the beast.

Since you have a PCV, you might be OK.

Cummins diesel engines are the same, but no crankcase vacuum of any kind.
It's REALLY hard to get them installed right and not leak.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: PTFE rear main seal installed NOT dry [Re: eyeofthetiger] #4734784 04/21/18 08:50 PM
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andyd Offline
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hmmn, is the PTFE seal the standard for older Rangers? Which engine? Transmission? Freaken Ford and their weirdness. The RMS for the Rat's 4.0 is an lip seal of something but it wasnt PTFE. I go to the Ranger Station forum and after a few yrs of helping out mostly kids. I can get a fairly rapid response from a few genuinely knowledgeable Ford mechanics. grin2


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2
Re: PTFE rear main seal installed NOT dry [Re: eyeofthetiger] #4734785 04/21/18 08:50 PM
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oldhp Offline
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I've used white lithium grease on every rear main, trans out put, pinion seal etc, etc. Never had one leak yet.


"None of us are getting out here alive.....drink that beer.....eat that pizza......drive that Hot Rod"
"When others cut you down, remember where they came from."
"I don't run...........I just wait"
Re: PTFE rear main seal installed NOT dry [Re: andyd] #4734793 04/21/18 09:04 PM
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eyeofthetiger Offline OP
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Originally Posted By: andyd
hmmn, is the PTFE seal the standard for older Rangers? Which engine? Transmission? Freaken Ford and their weirdness. The RMS for the Rat's 4.0 is an lip seal of something but it wasnt PTFE. I go to the Ranger Station forum and after a few yrs of helping out mostly kids. I can get a fairly rapid response from a few genuinely knowledgeable Ford mechanics. grin2


I think the seal material is whatever the seal maker wants. I have probably put in PTFE seals in customer cars and greased them without knowing they were PTFE, but I never heard a complaint. Who ever reads that little piece of scrap paper that comes in the box? I guess I will find out how important a dry install is, because I'm not taking it apart anytime soon!

This Ranger is a 2.0L Lima with a single barrel carburetor and a Toyo Kogyo 5-speed transmission. Nothing fancy. It needs a few more things, and then it should be driving down the road by the end of next week.

Re: PTFE rear main seal installed NOT dry [Re: eyeofthetiger] #4734804 04/21/18 09:18 PM
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Ducked Offline
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Guessing that the layer of grease MAY provide a leak path and/or prevent the seal mating...er...intimately, with the surfaces, and that a PTFE seal isn't supposed to need lubrication because its, like, made of PTFE.

Thats my theory, which is mine.

Last edited by Ducked; 04/21/18 09:19 PM.
Re: PTFE rear main seal installed NOT dry [Re: eyeofthetiger] #4734819 04/21/18 09:31 PM
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dlundblad Offline
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I would have added oil to OP, don't feel bad.

Unless you want to redo the job, the only thing you can do is keep an eye on it. I doubt it'll blow out as your driving is that's your concern.


03 Jeep WJ 4.0 202k Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 195k M1 0w40 Mahle OX149D
97 Chvy Blazer 4.3 158k M1 EP 10w30 Supertech ST3980

Re: PTFE rear main seal installed NOT dry [Re: eyeofthetiger] #4734829 04/21/18 09:46 PM
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Ducked Offline
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How come this is in "off topic"?

Re: PTFE rear main seal installed NOT dry [Re: Ducked] #4734853 04/21/18 10:15 PM
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eyeofthetiger Offline OP
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Originally Posted By: Ducked
How come this is in "off topic"?



Because beer

Re: PTFE rear main seal installed NOT dry [Re: eyeofthetiger] #4734877 04/21/18 10:56 PM
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Ducked Offline
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Originally Posted By: eyeofthetiger
Originally Posted By: Ducked
How come this is in "off topic"?



Because beer


Beer should never be off topic

Re: PTFE rear main seal installed NOT dry [Re: eyeofthetiger] #4734885 04/21/18 11:14 PM
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NoNameJoe Offline
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Was it the outer lip or the inner sealing lip? It sounds like you did the outside, the inside is I think what they mean when they stay install dry.

If you did the inner sealing lip, sorry hate to break it to you but it's likely to fail. PTFE seals are special because the sealing lip has PTFE that sort of melts or transfers a little PTFE on to what it's sealing against. This makes the sealing surfaces slide on each other smoothly.

Greasing the sealing lip prevents this from happening. There are peculiarities with PTFE seals vs other materials like neoprene or nitrile. For example PTFE seals usually come stretched with a ring you are only supposed to remove when installing (some of them say to use the ring to guide the seal into position). Then you're supposed to wait a few hours for the inner sealing lip to shrink a little. Then you start the engine and it transfers the PTFE over.


2015 Civic LX Coupe
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