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Larger crank pulley, smaller water pump pulley. What belt?

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Old 06-20-2022, 12:24 AM
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2004 Crossfire (w/M113K), 2006 E55 AMG
Larger crank pulley, smaller water pump pulley. What belt?
I just installed a UPR 180mm crank pulley, and it comes with a smaller water pump pulley. When I went to put the stock K060970 serpentine belt back on, I found it is just a little bit too long. What serpentine belt is everyone going with when installing these?
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Old 06-20-2022, 11:51 AM
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2004 Crossfire (w/M113K), 2006 E55 AMG
Additional info: My engine is from a 2003 CL55 AMG, which specifies a K060970 belt. I noticed that later E55's use a K060966 belt. Perhaps this is where my problem comes from?
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Old 06-20-2022, 09:56 PM
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2004 Crossfire (w/M113K), 2006 E55 AMG
FWIW, I went and picked up 5 different belt lengths, and the winner was a K060960. It fit perfectly.
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