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vettenuts · 07-22-2019, 06:35 AM

Has anyone replaced the grommet that seals the filler/dipstick tube of their Allison transmission? I am hoping to change mine next month when I do my fluid change but am fearful of it breaking apart and going inside the transmission.

LETMGROW · 07-22-2019, 12:33 PM

Quote:

Originally Posted by vettenuts

Has anyone replaced the grommet that seals the filler/dipstick tube of their Allison transmission? I am hoping to change mine next month when I do my fluid change but am fearful of it breaking apart and going inside the transmission.

Honestly I wouldn't worry about it. When I change transmission fluid I always drop the pan and clean it out anyway and change the internal filter. Change the grommet at the same time and you won't have a problem.
Lynn

Arch Hoagland · 07-22-2019, 10:31 PM

I don't recall there being one on my transmission tube and I've changed the fluid many times. Are you using Transynd?

LETMEGROW....is your an Allison 1000 transmission? Allison recommends never changing the internal filter unless the transmission is being overhauled. Only yhe external spin-on filter should be changed.

vettenuts · 07-23-2019, 04:10 AM

Yes, this will be the second change with Transynd.

harleyjt · 08-01-2019, 10:29 PM

Quote:

Originally Posted by vettenuts

Has anyone replaced the grommet that seals the filler/dipstick tube of their Allison transmission? I am hoping to change mine next month when I do my fluid change but am fearful of it breaking apart and going inside the transmission.

Why bother with it unless you see the fluid contaminated with water when you do your fluid change? You would probably be better off leaving it alone.

jt

vettenuts · 08-02-2019, 06:15 AM

Quote:

Originally Posted by harleyjt

Why bother with it unless you see the fluid contaminated with water when you do your fluid change? You would probably be better off leaving it alone.

jt

It’s leaking

harleyjt · 08-02-2019, 10:23 PM

Quote:

Originally Posted by vettenuts

It’s leaking

Good reason to screw with it!

jt

vettenuts · 08-03-2019, 07:11 AM

I plan to carefully clean the area and then try to remove. If it looks like it might turn into a disaster I might leave it alone.

harleyjt · 08-03-2019, 05:52 PM

Quote:

Originally Posted by vettenuts

I plan to carefully clean the area and then try to remove. If it looks like it might turn into a disaster I might leave it alone.

I wouldn't think it would be too hard to change. You just need to be sure and remove all the attaching hardware so the tube is free to move upward.
jt

vettenuts · 08-04-2019, 06:17 AM

Looks like one really big bolt on the dipstick tube, but haven’t thoroughly scoped it out yet. Hope to get to this in a couple of weeks.

Arch Hoagland · 08-04-2019, 10:47 AM

I checked my Allison 1000 filler tube and dipstick. There in no grommet of any sort on the tube.

However on the dipstick up inside it there is a rubber gasket that acts as a seal.

vettenuts · 08-04-2019, 01:19 PM

Quote:

Originally Posted by Arch Hoagland

I checked my Allison 1000 filler tube and dipstick. There in no grommet of any sort on the tube.

However on the dipstick up inside it there is a rubber gasket that acts as a seal.

On mine, the tube goes into the top of the pan mount. The grommet goes into the transmission and then the tube goes into the grommet. Looks like this.

harleyjt · 08-04-2019, 07:56 PM

Quote:

Originally Posted by vettenuts

On mine, the tube goes into the top of the pan mount. The grommet goes into the transmission and then the tube goes into the grommet. Looks like this.

Quote:

Originally Posted by Arch Hoagland

I checked my Allison 1000 filler tube and dipstick. There in no grommet of any sort on the tube.

However on the dipstick up inside it there is a rubber gasket that acts as a seal.

The transmission in question is a 2100 series, not a 1000. Have no idea if that makes any difference or not. I really don't see how the tube wouldn't leak at the transmission if there is no o-ring or gasket of some type to effect a positive seal.
jt