Differential Front seal

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JimG
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Differential Front seal

Post by JimG » Thu Mar 28, 2019 6:15 pm

Has anyone replaced the front diff seal in the car? Any tips?
Jim Gosses
86 XR4TI, 165K, IC, RR, PBR Fronts, T-bird Rear Discs
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Power Tryp
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Re: Differential Front seal

Post by Power Tryp » Thu Mar 28, 2019 7:27 pm

Super easy. If you're worried about bearing preload, don't cause there's an inner nut that handles that.

Service manuals: http://forum.merkurclub.net/forum/viewtopic.php?t=32434
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80 924 Turbo

JimG
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Re: Differential Front seal

Post by JimG » Thu Mar 28, 2019 10:41 pm

Was it hard to take apart ie; rusted nut & spline etc?
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Re: Differential Front seal

Post by Power Tryp » Fri Mar 29, 2019 12:42 pm

Not really, A little PB blaster, a breaker bar and a pry bar between two bolts threaded back into the flange.

While you're in there a little PTFE thread sealant on the splines of the pinion will prevent any potential future leaks through the nut which is why I had to do it.

Cheers!
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80 924 Turbo

JimG
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Re: Differential Front seal

Post by JimG » Thu Apr 04, 2019 1:16 pm

Just going in to replace the diff seal, whats the secret to draining the diff fluid? And what is a brand name for the PTFE sealant? Also is the nut reverse threaded?
Jim Gosses
86 XR4TI, 165K, IC, RR, PBR Fronts, T-bird Rear Discs
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DPDISXR4Ti
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Re: Differential Front seal

Post by DPDISXR4Ti » Sun Apr 07, 2019 9:20 am

Since there is no drain plug, the fluid is removed by removing the back cover. To remove the back cover, the rear mount needs to be removed, which is more readily done with the fuel tank cover out of the way. By that point you might just as well remove the whole differential and make life easier. While it's on the bench, drill a 1/8" NPT hole in the right rear bottom corner of the case to facilitate easier drains in the future.

The flange nut requires a 24mm deep socket to remove - standard RH thread - an impact gun makes the job quick and easy.
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JimG
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Re: Differential Front seal

Post by JimG » Tue Apr 09, 2019 4:44 pm

This is definitely a lift job, with the car on ramps I was unable to get enough leverage on a breaker bar to budge it and my air wrench didn't have enough oomph due to a weak compressor! So on Monday its off to a shop I trust! Spent far too much time on this! Thanks for all your help.
Jim Gosses
86 XR4TI, 165K, IC, RR, PBR Fronts, T-bird Rear Discs
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Re: Differential Front seal

Post by JimG » Tue Apr 30, 2019 5:06 pm

Had the seal replaced and new dif fluid - $149 + seal & fluid - well worth it!
Jim Gosses
86 XR4TI, 165K, IC, RR, PBR Fronts, T-bird Rear Discs
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