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Old 08-07-2012, 02:28 PM   #1
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Dipstick leak

I discovered a transmission fluid leak at the base of the dipstick/fill tube where it enters the transmission. It's an Allison MD3060.

Is there just an "O" ring at the bottom of the tube? Is it difficult to change?
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Old 08-07-2012, 07:30 PM   #2
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Should not be an O ring. There should be a tight fit with about an inch into the hole. Some thread in and others push snug. Since that is not a pressure situation I would, when the engine block is cool, clean with solvent the bottom area and use automotive silicone around the tube where it fits the block.Should take care of the leak with minimum cost
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Old 08-07-2012, 08:01 PM   #3
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there is an O ring on some coaches. I replaced one on a 94 Foretravel with an Allison
6 speed. I don't know about newer than that call allison they can tell u. I wouldn't use
silicone till I chk with allison gets pretty down there
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Old 08-07-2012, 10:07 PM   #4
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I don't think this one is threaded because it looks like a one piece tube with a sweeping 90 degree bend. There is a clamp around the tube about 2" above the point where it enters into the tranny.

My concern is that the tube might be corroded to the point where it leaks. I know it's not a pressure situation, but it does leak while sitting.

I'll give Allison a call to see what they recommend. Thanks for the input.
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Old 08-07-2012, 10:26 PM   #5
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Clean it and check for a leak at the bend.

I had a leak on mine in about the same spot. It was at the bend. It was over 450 bucks to replace with a like dip stick. The shop (authorized Allison facility) suggested I replace with a regular trk dip stick. (under 40 bucks) About 12" in length. I can check the tranny levels without leaving the drivers seat. And if I need to add fluid I have access to the stick through my one bay door. The other option was to try and weld the thinning bend leak, no guarantee. I did the short stick.
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Old 08-08-2012, 04:27 PM   #6
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The dipstick tube has a seal that is installed in the trans case,it has a metal washer inside at the top that sometimes seperates from the rubber.It is a simple change,pick up a new seal at your local distributer.Pull the dipstick out about three inches,remove the bolt located 2 inches from the seal area,drain about a gallon of fluid(or replace with engine running)pull out the tube,remove the seal and install new one,reinstall tube and bolt.Refill and thats it.
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Old 08-11-2012, 01:04 PM   #7
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I drained about a gallon of fluid and then cleaned up the area around the dipstick. The tube is corroded but not bad enough to leak so I ordered a new rubber seal ($2.10). My problem now is how to get the tube out of the tranny. It makes the gentle 90 degree bend but almost hits the bottom of the coach floor, no room to pull it out 2" or 3".

I've tried a couple of times to attach pictures but I keep getting the message "File is Too Large".

Any ideas on how to make enough room to get the tube out of the tranny?
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Old 01-09-2013, 02:33 PM   #8
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Dipstick leak

They can be a bugger to get especially when the tube is close to the floor. MIght have to take off an clamps that are holding it in place, or brackets that hold it to the bell housing. Once the tube is completely loose, you should be able to wiggle it out and up and replace the seal.
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