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willysmjeeps.com :: View topic - Rear Pinion Seal Woes
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Rear Pinion Seal Woes

 
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Nic
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Joined: Dec 03, 2009
Posts: 109
Location: United Kingdom

PostPosted: Tue Sep 28, 2021 8:13 am    Post subject: Rear Pinion Seal Woes Reply with quote

All,

I have recently replaced a leaking rear pinion seal with a new one from John at Midwest I included the paper washer and felt seal in the re-build.
I parked it up after a quick run and this evening noticed the ominous drip of oil cascading over the UJ of the prop shaft. I tightened the nut to about 40/Ibs torque

Could someone please confirm that the nut should be torqued down to 220ft/Ilbs and the reason why this should be so high? Am I correct in that its something to do with the pre-load?

Thank You

Nic
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Restoring 1956 M38A1 Nekaf
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wesk
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Joined: Apr 04, 2005
Posts: 15626
Location: Wisconsin

PostPosted: Tue Sep 28, 2021 10:32 am    Post subject: Reply with quote

Your assumptions are correct and your figures are correct.

These differential input shaft leaks are usually caused by the age old wear grooves the seals rubbing against all the dirt leave on the shaft. The two possible solutions for this seal groove problem are the added shaft sleeves that give a new straight rubbing surface for the new seals or a new input shaft. Also the metal shell of the new seals must be RTV'd to the diff housing. Note also that drive shaft splines are also RTV's during assembly.
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

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Nic
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Posts: 109
Location: United Kingdom

PostPosted: Tue Sep 28, 2021 10:52 am    Post subject: Reply with quote

Thank You for the guidance Wes.

Regards

Nic
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jake138
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Joined: Nov 18, 2014
Posts: 81
Location: Connecticut

PostPosted: Sun Oct 03, 2021 7:47 am    Post subject: Reply with quote

Redi Sleeve 99156 is the part number you need, you can search around for local suppliers if you'd like, Amazon is the cheapest I've seen:

https://www.amazon.com/National-Seal-99156-Differential-Pinion/dp/B000C5JNDS

The front pinion and rear pinion yokes, as well as the both front and rear outputs on the transfer case, all use the same sleeve. They've very easy to install, instructions are included, and they are much cheaper than replacing the entire yoke with some offshore junk.
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Jake, Central CT
51 M38 s/n 35627
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