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That 0 to 1 mm upper preload could only be measured with dial indicator as far as I know. I've always guesstimated it after tensioning the belt. I never paid attention to what people said unless it was it the FSM anyway. It doesn't take much preload at all to make the BS belt whirr. I usually get a very slight BS whirr that dissipates in about 50 miles.
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86 - 951 - Garrett dbb T3/T4R/Tial/Maxtronic -SOLD
91 - BMW 325 iX AWD, 5-spd Coupe, Lazur Blau Metallic-SOLD
86 - 951-K26/8, daily driver-SOLD
87 - 944S - Another daily driver-SOLD
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