Correct AC belt
March 23rd, 2023, 10:22 AM
#1
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Join Date: Dec 2013
Posts: 163
Correct AC belt
My 70 442 AC belt is squeaking. Looked up a Gates replacement at Oreillys today - guy says it is supposed to be about 58" long but mine measures almost 64". What is the correct length belt? Who knows I might have the wrong pulleys...
March 24th, 2023, 08:13 AM
#3
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Posts: 163
What's odd is the existing belt (not broken and works fine) measures exactly 63- 5/8" outside. No way a belt 3" shorter is going to fit.
could it be I have an incorrect pulley on crank?
could it be I have an incorrect pulley on crank?
Last edited by PaulWinn; March 24th, 2023 at 08:20 AM.
March 24th, 2023, 01:08 PM
#5
Old(s) Fart
Join Date: Mar 2007
Location: Northern VA
Posts: 47,668
Correct. The outer circumference is not the published measurement. Depending on the cross section of the belt, you subtract 2"-3" from the outer circumference to get the rated length. 63 5/8 - 3 = just about exactly the 60.5 the factory says it is. Keep in mind that there is more than 1" of travel in the adjusting slots, and a 1" longer belt amounts to only about 1/2" extra travel in the adjusting slot.
March 25th, 2023, 09:12 AM
#10
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Location: elkhart indiana
Posts: 498
Gates lists 7603 as the correct number if you look it up by make and model but if you look it up the cross reference to the gm number 401475 it comes up 7612.
per gates web site 7603 has an effective length of 60 inches , the 7612 has an effective length of 61 inches.
how much to short is the 7603?
per gates web site 7603 has an effective length of 60 inches , the 7612 has an effective length of 61 inches.
how much to short is the 7603?
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