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Old 08-27-2009, 04:08 PM   #1
figgskzoo
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Default oil leak in differential case at lift arm connection - help!

Has anyone seen an oil leak in an 8N diff case where the lift arm attachment stud inserts into the diff case. By the looks of things, my lift arm attachment stud is somehow sliding outward and causing this leak. Anyone have any idea how to fix this? I've tried tapping on the attachement bolt head with a hammer - no go.
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Old 08-27-2009, 04:57 PM   #2
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Default Re: oil leak in differential case at lift arm connection - help!

..

To fix the lift pins, you need to take the left trumpet off..

Go in from the left side to reach the right castle nut, also fix the left side while you have the trumpet off..



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Originally Posted by figgskzoo View Post
Has anyone seen an oil leak in an 8N diff case where the lift arm attachment stud inserts into the diff case. By the looks of things, my lift arm attachment stud is somehow sliding outward and causing this leak. Anyone have any idea how to fix this? I've tried tapping on the attachement bolt head with a hammer - no go.

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Old 08-27-2009, 05:07 PM   #3
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Default Re: oil leak in differential case at lift arm connection - help!

More info..
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Old 08-27-2009, 05:19 PM   #4
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Default Re: oil leak in differential case at lift arm connection - help!

Ken I believe you have done this before.
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Old 08-27-2009, 05:54 PM   #5
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Default Re: oil leak in differential case at lift arm connection - help!

so, by the looks of things, left wheel, left trumpet, and diff carrier all need to be removed to get at this one, simple castle nut, eh? What a collosal PITA!

Do the trumpets hold the carrier case's outer bearing races, and assembly of the trumpets to the diff case 'squeezes' and mounts the carrier?

Ken = Da Man

Thx for great info, Ken!
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Old 08-27-2009, 06:27 PM   #6
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Default Re: oil leak in differential case at lift arm connection - help!

Wow, I'm glad mine are tight!
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Old 08-27-2009, 06:36 PM   #7
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Default Re: oil leak in differential case at lift arm connection - help!

[quote=figgskzoo;795019 Do the trumpets hold the carrier case's outer bearing races, and assembly of the trumpets to the diff case 'squeezes' and mounts the carrier?[/quote]

Yes the carrier races are in the trumpets.
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Old 08-27-2009, 08:14 PM   #8
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Default Re: oil leak in differential case at lift arm connection - help!

What type / weight of oil do y'all recommend I use to refill the diff case?
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Old 08-27-2009, 11:17 PM   #9
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Default Re: oil leak in differential case at lift arm connection - help!

you can go back in with 90w gl1/3 the original spec.. or an 80w90 gl4/5 that is yellow metal safe.. or a utf fluid that mees the ford spec M2C134D.. remember.. it's your trans and hyd fluid too... about 5g worth..

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Old 08-28-2009, 09:25 AM   #10
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Default Re: oil leak in differential case at lift arm connection - help!

Also, DO NOT over fill the system, less is better than more here. Best way to get your oil level correct is to remove the bottom bolt of your side cover and fill till the oil just runs out of it.
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Old 08-28-2009, 09:32 AM   #11
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Default Re: oil leak in differential case at lift arm connection - help!

I'm a noob here - as my post numbers show. Nevertheless, in my short time here I've received some of the friendliest, most informative help I've ever had on any forum of any kind. Please accept a huge "Thank You"! Take a bow, guys!
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Old 08-28-2009, 12:07 PM   #12
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Default Re: oil leak in differential case at lift arm connection - help!

I had same problem. Had a guy do exactly as presented here. It worked and have had no problem since. So some good news for the future-after the fix.
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Old 09-01-2009, 09:07 AM   #13
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Default Re: oil leak in differential case at lift arm connection - help!

Well, I receive my 'trumpet to diff case' gaskets today and am planning on tackling this project. I have three (more) questions? First, does the fact that I'm having this problem necessarily mean that I need to replace the studs with new ones? Second, are there any tips or tricks for this process that might make my job a bit easier? Third, should I put some RTV into the tapered 'sealing surfaces' in the trumpets and on the studs to assure a good seal?

Thanks for all the help, guys!
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Old 09-01-2009, 09:55 AM   #14
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Default Re: oil leak in differential case at lift arm connection - help!

Quick follow-up: I called my local equipment supply shop to see if they had new lift mount studs in stock. They also have sort of a tractor salvage yard. The fellow that answered tried to sell me used 'take offs' for $20 each. I explained to him that the tapered surface is a precisely machined area and that I was concerned with them sealing correctly. "You've gotta be kidding me!" was his response. "No, I'm not kidding you." was my reply. I won't be calling there again for *anything*. Basically, I already *have* used ones that aren't sealing...jeez.

Last edited by figgskzoo; 09-01-2009 at 10:39 AM. Reason: better explanation of call
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Old 09-01-2009, 10:17 AM   #15
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Default Re: oil leak in differential case at lift arm connection - help!

As long as the hole is not wallowed or misshaped I would not use any thing on it, just torque it to 150# and forget about it. Now if it is egged any then if I were not going to replace the trumpet THEN I would use some #2 Permatex, I have had better luck sealing things of this nature with Permatex than RTV. What I guess I am saying is it depends on what the hole looks like.
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