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Old 09-25-2008, 03:51 PM   #1
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DIY? Pinion Seals

Hello Guys!

Well, my Jeep is currently at the shop having basically the entire cooling system overhauled and the belt replaced It isn't going to be cheap, but I need it to be right, so there you have it!! $$$$$ I am just going to have to put off my next mod until I can absorb this chunky shot in the wallet.

With that being said; they found that both of my pinion seals are leaking.. This is the only mechanic I have ever thoroughly trusted EVER, so there must be a problem.. I haven't noticed anything other than grease around the pumpkin, so I am wondering..

How hard is it to replace the pinion seals in the D44 rear and D30 Front?

Thanks for any help you can provide.

Sincerely,

TM

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Old 09-25-2008, 04:31 PM   #2
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It's not that hard if you know how to set gear backlash and have the ability to set the torque at around 250ft/lbs on the pinion nut. Do it wrong and you eat a set of gears. Personally I'd have done the cooling system myself and paid for the pinion seals. Cooling system R&R is easy if you use all new parts.
That said it depends also on how bad they are leaking, if it's just a minor wet spot I'd leave it alone, just check the level every couple weeks till you see if it's loosing any that you can measure with your finger. I've had my HP D30 XJ's front one weeping for the better part of 7 years. I change my gear oil every two years unless I spend time in water. It's almost not measurable.

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Old 09-25-2008, 04:47 PM   #3
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you shouldnt have to adjust your backlash to do the pinion seal, the only thing will be the preload.....
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Old 09-25-2008, 05:02 PM   #4
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its pretty easy you need to mark the nut that holds the yoke on and mark the yuke and housing mark it all in a line and then count the threads so that when you go back together the nut will be in the exact same spot then remove nut remove yoke remove seal you need to clean yoke with fine sandpaper to remove ridges then i put a little rtv around the outside of the seal install seal oil yoke install yoke then put the nut back on in the exact same spot it came from i have had no problems fixing them like this
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Old 09-25-2008, 05:24 PM   #5
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the backlash doesn't change. the preload is already set by the crush sleeve, i'm pretty sure the d44 is the same as the d30 w/ a crush sleeve. i don't trust the 250 ft/lb spec, although that is what a manual will say. you could add more preload to the bearing and burn it up.

replacing the seal is cake. reinstalling the yoke and nut is where you can cause probs. i've done countless, its a good idea to replace the pinion nut, they do say its one time use, and i've seen a couple come back on guys that re used the nut w/ no threadlocker, if i'm forced to reuse the nut, i will use some blue threadlocker. you want to make it nice and tight, but without crushing the sleeve any more.

a strong impact gun works fine, zip it down, and give it a couple raps after its tight and you're done. i've personally done too many to count in this fashion, never had one come back. just my input, take it or leave it.
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Old 09-25-2008, 06:11 PM   #6
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This one will go to the pros...

Quote:
Originally Posted by richp View Post
It's not that hard if you know how to set gear backlash and have the ability to set the torque at around 250ft/lbs on the pinion nut. Do it wrong and you eat a set of gears. Personally I'd have done the cooling system myself and paid for the pinion seals. Cooling system R&R is easy if you use all new parts.
That said it depends also on how bad they are leaking, if it's just a minor wet spot I'd leave it alone, just check the level every couple weeks till you see if it's loosing any that you can measure with your finger. I've had my HP D30 XJ's front one weeping for the better part of 7 years. I change my gear oil every two years unless I spend time in water. It's almost not measurable.
Thanks for the help guys, but I think I am going to have that done by the pros.. DARN IT!

The dealership just looked it over and mentioned it because the pumpkin(s) are showing a little grease spots near the yoke.. It hasn't leaked on the garage floor... YET!!! I had my yukon in there recently which had the same coloring on the pumpkins and they said everything was fine..

I would have done the radiator myself, but the serpentine belt and Thermostat housing were the straw that broke the Camel's back.. I have virtually no time to spend on an all day job at present.. Besides, i am really only into basic maintenance issues, so i think all-in-all, this was out of my league.. I need to figure out how to replace my budget for Air lockers front and back as that is the next project!

Am I done after that?
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Old 09-26-2008, 11:52 AM   #7
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If you are doing air lockers front and back, you could just wait untill then to do the pinion seals. It will come with the rebuild kit needed to install the lockers. Thats how my dana 44 pinion seal was fixed.

Like richp said, if your just weeping oil just check the level every once in awhile and you'll be fine.

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