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Old 07-14-2017, 04:26 PM   #1
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MD3060 Allison Transmission Leak

My Allison MD3060 has a leak. It is from what looks to be an expansion plug that plugs a hole that is used for a dipstick in some applications. I found that info from looking at diagrams. I tried to tighten it up but the nut just goes round and round. If I loosen it, lots of transmission fluid leaks out. I assume I need to replace it. I don't know how to get it out other than loosening it the most I can and prying it out. Or where to get a replacement plug. Any advice appreciated.
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Old 07-14-2017, 05:17 PM   #2
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Drain the fluid, drop the pan, and see if there is a nut on the bottom side. If there is, re-tighten the bolt while holding the nut. Reinstall the pan and then fill the trans back up and check for leaks.
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Old 07-14-2017, 05:46 PM   #3
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Originally Posted by Booyah45828 View Post
Drain the fluid, drop the pan, and see if there is a nut on the bottom side. If there is, re-tighten the bolt while holding the nut. Reinstall the pan and then fill the trans back up and check for leaks.
That is a lot of work on that trans if it isn't due for service. Many bolts, new gasket, etc.

My advice is to call a few Allison shops- make sure they are rated for 3000 series as some are not setup for heavy trans. Explain and maybe it is externally repairable plug.
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Old 07-14-2017, 05:48 PM   #4
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Originally Posted by Booyah45828 View Post
Drain the fluid, drop the pan, and see if there is a nut on the bottom side. If there is, re-tighten the bolt while holding the nut. Reinstall the pan and then fill the trans back up and check for leaks.
That is a lot of work on that trans if it isn't due for service. Many bolts, new gasket, etc.

My advice is to call a few Allison shops- make sure they are rated for 3000 series as some are not setup for heavy trans. Explain and maybe it is externally repairable plug.

Else pull plug and fish nut out with magnet. maybe rubber plug is just shot.
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Old 07-14-2017, 11:54 PM   #5
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Thanks, what kind of fluid does this take?
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Old 07-15-2017, 04:55 AM   #6
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tes 295,etc.. fluid
look up your tranny on the allison website.
if you change your fluid, you are good many yrs of normal skoolie convrsion driving
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Old 07-15-2017, 10:10 AM   #7
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I have been googling to try and find you the dipstick plug and cant find the part number.,. my allison trans was built to use a dipstick on either side.. left or right... it has a standard dispstick seal and then a plastic snap-in plug that fits inside of said seal... you move the plug to the side opposite where you wsnt your dipstick..

im thinking an allison rebuilder probably has these things laying around as any rebuild would need one.. you may be able to just pull that seal out{pull straight up} (yes your fluid will come out) and use a new dipstick seal with the same plug? hard to tell without a pic.

-Christopher
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Old 07-15-2017, 11:20 AM   #8
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I will do a drain and refill and see if there is a nut that is spinning on the other side. But it will be a couple weeks before I can do this as it is more of a big job than I thought. I will keep you all posted. Thanks
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Old 07-15-2017, 11:54 AM   #9
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you should pull the plug just to see whats there. if it spins freely, it ought to be loose enough to pop out.

i have a similar dipstick plug with my new trans, and its better than the old one so i was seeing if i could modify it.

anyway, the piece i have has slotted threads on the lower portion of the bolt, this seems to keep the nut from coming loose.

mine is different in that it has the T top dipstick handle, but maybe you have some threads that saved the nut.

if you want a picture of my plug i can easily oblige
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Old 07-15-2017, 01:33 PM   #10
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turf, you dont have the deep pan? where the dipstick oges into the side of the pan?
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Old 07-15-2017, 06:49 PM   #11
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this dipstick was just sitting in one of the big mounting holes on top.

the rubber is nicer than my dipstick so i was looking at swapping them, but this one is much fatter and doesn't fit the tube.

the vertical cuts through the threads keep me from easily undoing dipstick part. perhaps allison specs their plugs the same way.
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Old 07-17-2017, 09:58 AM   #12
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I've never had trouble reusing the gaskets, so unless you tear them upon removal, you should be ok. I also don't think that any of the covers can be removed for access either. You can try removing the plug without dropping the pan and see what that gets you, but be prepared to drop the pan if you have to.
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