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Author Topic: HT740 problem  (Read 1016 times)
MC8Mike
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« on: February 13, 2013, 04:18:55 PM »

I need some help from the Allison experts. I did a service on my trans today and three small aluminum ears were floating around in the pan. They were all broken the same. Not much other debris, where the heck did they come from? I took a picture of them but can't get it to post for some reason. Thanks for any help

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1973 MC8 in progress but we're going to use it this year!
Fallon, Nevada
Dave5Cs
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1979 MCI MC5Cs 6V-71 HT-740 Allison, Roseville, CA




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« Reply #1 on: February 13, 2013, 04:56:29 PM »

Came from the US mint!... Sorry couldn't resist. Cheesy
wow not good to find pieces of gear teeth which those look like. May be from your tail gears splines, I'm just guessing but is definitely good you have them out. Do you have any problems you have noticed with shifting or noises?.

Dave5Cs
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MC8Mike
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« Reply #2 on: February 13, 2013, 05:19:55 PM »

No, no noises. It functions pretty well but has a bit of a lazy shift between 2-3. That is what prompted me to do a service and see what was in the pan. They are not gear teeth, look to be some kind of a dog off an aluminum part.
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1973 MC8 in progress but we're going to use it this year!
Fallon, Nevada
Utahclaimjumper
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« Reply #3 on: February 13, 2013, 06:06:55 PM »

 They appear to be SAWED off, not broken off.>>>Dan
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Utahclaimjumper 
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Dave5Cs
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1979 MCI MC5Cs 6V-71 HT-740 Allison, Roseville, CA




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« Reply #4 on: February 13, 2013, 06:17:15 PM »

sounds like they may be part of the second gear area
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MC8Mike
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« Reply #5 on: February 14, 2013, 05:11:51 AM »

No they are not sawed off, the piece on the left in the pic shows broken off and all three are the same. The area that looks sawed is a machine finish.
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1973 MC8 in progress but we're going to use it this year!
Fallon, Nevada
Boomer
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« Reply #6 on: February 14, 2013, 05:41:44 AM »

Might try to email the pics to AZ Transmission they can tell you.
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MC8Mike
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« Reply #7 on: February 14, 2013, 07:07:45 AM »

That's a good idea, thanks for the suggestion.
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1973 MC8 in progress but we're going to use it this year!
Fallon, Nevada
Don Fairchild
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« Reply #8 on: February 14, 2013, 07:58:46 AM »

sorry to say but those are out of a clutch pac. Probably the forward clutch,

Don
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Scott Bennett
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« Reply #9 on: February 14, 2013, 08:56:41 AM »

sorry to say but those are out of a clutch pac. Probably the forward clutch,

Don


That's what they look like to me too.  Sad  Here's a shot of what we might be seeing?? Not a tranny expert:

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Scott & Heather
1984 MCI9 6V92-turbo with 9 inch roof raise & conversion in progress.
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« Reply #10 on: February 14, 2013, 11:03:30 AM »

It looks like the drive hub between the forward pack and the fourth gear clutch pack it a cast aluminum with the same look of the plates 
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MC8Mike
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« Reply #11 on: February 14, 2013, 12:27:58 PM »

Looks like I'll be tearing it down sooner than later. Broken pieces floating around in a trans is never good. Thanks for the replies.
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1973 MC8 in progress but we're going to use it this year!
Fallon, Nevada
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