Riddle me this..

Mike L.

Got Sheep?
Staff member
Vendor/Sponsor
Aug 12, 2006
15,681
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Any thoughts as to why it would happen?? Lack of lube?

My Allison engineer told me it was a common problem and Allison had a lot of warranty issues due to the improper bonding of the C3/C4 pistons. This can happen at any time on a stock piston. I've seen many C3 pistons do this but this is the first time I saw a C4 piston do it. It doesn't surprise me since they are identical but C3 is under more stress than C4.
I have yet to see an Alto piston do this.
 

05_LLY

Out-A-Time
Aug 7, 2006
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Norvelt, PA
I have seen c3s tear like that, i have also heard from mike and an allison guy that the oe pistons had this issue.

I seem to be having a stupid moment here, can some one please explain to me how tuning can tear a apply piston?
 

Mike L.

Got Sheep?
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Vendor/Sponsor
Aug 12, 2006
15,681
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Fullerton CA
I have seen c3s tear like that, i have also heard from mike and an allison guy that the oe pistons had this issue.

I seem to be having a stupid moment here, can some one please explain to me how tuning can tear a apply piston?

Tuning cannot tear a piston. It is a bonding issue. Only the bottom lip touches the case surface. These pistons tear above the lip on the side wall and that part of the piston doesn't touch anything.
 

THEFERMANATOR

LEGALLY INSANE
Feb 16, 2009
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ZEPHYRHILLS, FL
My Allison engineer told me it was a common problem and Allison had a lot of warranty issues due to the improper bonding of the C3/C4 pistons. This can happen at any time on a stock piston. I've seen many C3 pistons do this but this is the first time I saw a C4 piston do it. It doesn't surprise me since they are identical but C3 is under more stress than C4.
I have yet to see an Alto piston do this.

I feel better now as I have ALTO pistons in it this time around.
 

05_LLY

Out-A-Time
Aug 7, 2006
1,756
1
36
43
Norvelt, PA
Tuning cannot tear a piston. It is a bonding issue. Only the bottom lip touches the case surface. These pistons tear above the lip on the side wall and that part of the piston doesn't touch anything.

I knew tuning didnt cause it, but i seen the lets blame the tuning talk starting so i wanted them to explain how it caused it!! Basiacly i was stiring the pot!!!
 

JoshH

Daggum farm truck
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Feb 14, 2007
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It's all Steve's fault!!!! :poke:

If he could figure out how to use the C4 apply piston table.......
 

SSchmi5519

LLY Cult Leader
Oct 19, 2008
3,387
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Arizona
I saw C4 and all i could think of was

tumblr_m43sq8UI2j1r9khx4o1_1280.jpg


I scared
 

hondarider552

Getting faster
May 28, 2008
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Tuning cannot tear a piston. It is a bonding issue. Only the bottom lip touches the case surface. These pistons tear above the lip on the side wall and that part of the piston doesn't touch anything.
I knew tuning didnt cause it, but i seen the lets blame the tuning talk starting so i wanted them to explain how it caused it!! Basiacly i was stiring the pot!!!
I was wrong. I knew what I wanted to say, but my brain sometimes lags behind. It was not tuning as Mike said, and as you know, but I dont think the tuning it had in it before I bought it helped any. It scared me.


if they made :banana: for texting, i think id have close to 1,000 by now :roflmao:

I have wasted 3/4 tank of fuel driving around. It's doin alright.. :D:hug:
It's all Steve's fault!!!! :poke:

If he could figure out how to use the C4 apply piston table.......
Thought that was a "X not reported" in the MIL? No...??? :rofl:

Think maybe he used the C4 apply chair instead.:roflmao:

Face meet palm :roflmao: