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Designer King
 
Paulporsche's Avatar
 
Join Date: Mar 2004
Location: Toronto, ON Canada
Posts: 5,499
AC Compressor Belt Deflection

I have new Griffith's AC components on my car, including the Kuehl compressor.

Bentley's specs a 5mm deflection for the alternator belt for SC engines but I haven't been able to find a spec anywhere for the compressor belt.

Is 5mm reasonable deflection for the AC belt?

Thanks.

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Paul
Yellow 77 Sunroof Coupe/cork interior; 3.2L SS '80 engine/10.3:1/No O2; Carrera Tensioners; 11 Blade Fan; Turbo tie rods; Bilstein B6; 28 tube Cooler; SSI, Dansk; MSD/Blaster; 16x7" Fuchs/205/50 Firestone Firehawk Indy 500s; PCA/UCR, MID9
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Old 07-19-2022, 07:27 AM
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wrxnofx's Avatar
 
Join Date: Jun 2012
Location: Richfield, MN
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I honestly don't think it's that important of a spec. Make it loose enough that the belt doesn't slip on the pulley when the clutch is engaged. I just push on the middle part of the belt with my finger and if it deflects a certain amount I'm fine with it.
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Old 07-19-2022, 04:06 PM
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Yes just make it reasonably tight. Watch your horizontal deflection as well - lining up the pulleys is important.
Old 07-19-2022, 10:44 PM
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GH85Carrera's Avatar
 
Join Date: Nov 2007
Location: Oklahoma
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Yea, it is hard to define, "tight enough" but not too tight.

It does not need to be cranked tight, and cause bearing wear. Just tight enough to not let the belt slip.

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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
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Old 07-20-2022, 07:49 AM
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