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Unread 08-06-2010, 06:27 PM   #1
rsoby
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Leaking from rear end. What is broken? I have a picture

After wheeling in deep mud and rocks I noticed some oil on the floor of my garage. I checked the level in the rear diff and as soon as I pulled the plastic plug thick oil started to ooze out. Is the level of the read diff supposed to be over the plug on the rear of the pumpkin?

Anyways, Here is a pic and you can clearly see where the oil is leaking from.

What is broken? I'm stumped.

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I have to leave my house in about an hour. Please read my last post. I don't want to ruin my rear. Is it safe to drive?

imag0130.jpg  

Last edited by rsoby; 08-13-2010 at 05:27 AM..
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Unread 08-06-2010, 06:31 PM   #2
jdhallissey
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That would be your pinion seal. Pull the driveshaft put the pinion nut pull the yoke off then pull the seal off. Then put it all back on in the same order then tighten the nut to 175 lbs.
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Unread 08-06-2010, 06:31 PM   #3
Mean Max
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Those weeds chewed up your pinion seal. You'll need a new one.

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No one here knows what they are talking about. You should try Pirate 4x4 they will be happy to help you.

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Unread 08-06-2010, 06:43 PM   #4
BYuen
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Originally Posted by jdhallissey View Post
That would be your pinion seal. Pull the driveshaft put the pinion nut pull the yoke off then pull the seal off. Then put it all back on in the same order then tighten the nut to 175 lbs.
He's got a D35 rear axle though. He'll have to worry about the crush sleeve and tighten it correctly or he'll mess up the pinion bearing/ring and pinion.
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Unread 08-06-2010, 06:48 PM   #5
rsoby
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How do I tighten it correctly?
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Unread 08-06-2010, 06:49 PM   #6
alex_c
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I re-did the seal on my d30 about 20,000 miles ago by counting threads and tightening 1/16th turn past my mark. No issues so far, and PLENTY of offroad abuse. Don't know if this will work with the 35

Also, diff oil will spill out if it's hot. It expands.
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Unread 08-06-2010, 06:49 PM   #7
jdhallissey
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Yea true.I don't know the torque rating for the dana 35. Whatever it is send it to that number. I still do believe it is really close to 175.
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Unread 08-06-2010, 06:53 PM   #8
ratmonkey
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the torque is variable depending upon preload needed.
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Unread 08-06-2010, 06:55 PM   #9
jdhallissey
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^ Correct but there is a "going number" that people use. I am trying to find it now.
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Unread 08-06-2010, 07:04 PM   #10
BYuen
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There are several techniques I've read about. One is doing it the fsm way measuring the pre-load to determine how much you need to torque the pinion nut to. The other involves something like marking the current location of the pinion nut and then just tightening it back to that location after replacing the seal. I don't remember the details. In a few older threads I found before, Jerry B describes how he did it for his TJ D30 or D35 (I can't remember) which both have crush sleeves without measuring the pre-load. I had a D30 pinion seal leak about two years ago. I was going to replace it myself, but went ahead and got it replaced by a shop for 50 bucks and 30 minutes of my time for the peace of mind.

Last edited by BYuen; 08-06-2010 at 07:15 PM..
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Unread 08-06-2010, 07:06 PM   #11
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http://www2.dana.com/pdf/AXSM-0053.PDF

Check this, confirm your serial number. Dana is awesome about providing details, this is just an example, however based on the rear end number.

Mostly on a rear axle, in the heavy truck end, I just replace seal and bump tight with an impact wrench 1/2'' will do.

All you need is a model number and a serial number, then check the OEM websites, generally they will provide service and parts manuals.
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Unread 08-06-2010, 07:09 PM   #12
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I was going to replace it myself, but went ahead and got it replaced by a shop for 50 bucks and 30 minutes of my time for the peace of mind.
This is what I am thinking.
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Unread 08-06-2010, 07:57 PM   #13
Knuckelhead
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The other involves something like marking the current location of the pinion nut and then just tightening it back to that location after replacing the seal.
I've marked the nut and pinion thread with a punch, then used lock tight with the original nut. I was poor then and it worked well...
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Unread 08-12-2010, 08:18 PM   #14
rsoby
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One last question. I found it odd that I was still leaking fluid the following day (about a 1 foot by 1 1/2 foot puddle). I removed the rear drain plug and it starting to ooze oil. I then put the plug back in to stop the loss of diff fluid. I'm guessing that it was overfilled to begin with above the level of the pinion seal and thats where the puddle came from.

Should I be worried about driving it to the shop tomorrow?

Will the level of fluid be ok to make a 10 mile ride?

Ideas?

(please)
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Unread 08-13-2010, 05:26 AM   #15
rsoby
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Bump. Have to leave in an hour.
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Tags
crush sleeve , d 35 , dana 35 , pinion nut , pinion seal

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