Allison 5sp: Issues after rebuild

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Evan@InglewoodTrans

Evan@InglewoodTrans

yerp
Vendor/Sponsor
Aug 5, 2010
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Western MA
Weisguy said:
I agree with you on torque specs. I have built motors before and the mains and head bolts are all that really need torqued. That's why my torque wrench is sized for those. I did torque the bellhousing bolts but 8 ft lbs sounds like a joke. That's about hand tight and I have trust issues with that. Lol. But can't argue with everyone saying I can't do more. I'm expecting to replace c1 and c5 most likely.
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Where did you get 8ftlbs is the torque spec for the bell housing?
 
joshd472

joshd472

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Oct 10, 2016
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Weisguy said:
Are they any different than mine? Thank you. I'll let you know
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I think they are the same. Someone correct me if I'm wrong.

It was working when I took it out of the truck. I only took it out because of bad advice. I thought it was the problem, but it turned out it was not the problem I wasn't dropping the pan again to put it back in.
 
J

JRein

Aircraft Mechanic's Hero
Sep 26, 2015
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LRAFB, Arkansas
Weisguy said:
I agree with you on torque specs. I have built motors before and the mains and head bolts are all that really need torqued. That's why my torque wrench is sized for those. I did torque the bellhousing bolts but 8 ft lbs sounds like a joke. That's about hand tight and I have trust issues with that. Lol. But can't argue with everyone saying I can't do more. I'm expecting to replace c1 and c5 most likely.
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You need to understand thermal expansion and how it relates to dissimilar metals better. From 0*C to 100*C, steel and cast iron expands similarly around 0.10%- 0.12%. Aluminum on the other hand expands 0.23%. This may or may not seem like a lot but I would consider cranking them down with German torque and thinking 8 ft #s was a joke is comparable to doing brain surgery with a steak knife.

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Weisguy

New member
Sep 16, 2017
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Cincinnati ohio
JRein said:
You need to understand thermal expansion and how it relates to dissimilar metals better. From 0*C to 100*C, steel and cast iron expands similarly around 0.10%- 0.12%. Aluminum on the other hand expands 0.23%. This may or may not seem like a lot but I would consider cranking them down with German torque and thinking 8 ft #s was a joke is comparable to doing brain surgery with a steak knife.

Sent from my SAMSUNG-SGH-I747 using Tapatalk
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Ok. I see what you're saying. Once it warms up, the bolts won't expand as much as the valve body which makes it tighter. If it's too tight then it will damage the soft aluminum body. Well good news there is I never ran it enough for it to get hot so that may have saved it from warping permanently. It never got much over 100 degrees at the trans temp sensor.
 
Ne-max

Ne-max

I like turtles
Nov 15, 2011
3,361
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Lincoln, Ne
Weisguy said:
Ok. I see what you're saying. Once it warms up, the bolts won't expand as much as the valve body which makes it tighter. If it's too tight then it will damage the soft aluminum body. Well good news there is I never ran it enough for it to get hot so that may have saved it from warping permanently. It never got much over 100 degrees at the trans temp sensor.
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How did you do a relearn? Most scanners require trans temp to be 110.
 
Awenta

Awenta

Active member
Sep 28, 2014
4,090
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CT
Weisguy said:
1. You don't have to have a scanner.

2. The cts has a relearn function that doesn't say anything about Temps.

3. I never got that far.
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Cts relearn is as much of a joke as its ability to read tcm codes.

Don't need a scanner to relearn??

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Ne-max

Ne-max

I like turtles
Nov 15, 2011
3,361
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48
Lincoln, Ne
Weisguy said:
1. You don't have to have a scanner.
2. The cts has a relearn function that doesn't say anything about Temps.
3. I never got that far.
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Sorry. I am new to this. Lol. Sorry for asking such a stupid question. I still think it's your c6 clutches.
 
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