Belts slip at high RPM? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 05-01-2008, 06:26 PM   #1
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Default Belts slip at high RPM?

i noticed that when the motor would reach a high rpm under hard acceleration the belts would slip for a second or two until the rpms came back down, i also noticed some kind of oil on the back of the A/C compressor, maybe that oil is spraying out at high rpm and getting on the belts causing them to slip? i dont realy know so if anyone has this similar problem let me know, thanx.
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Old 05-02-2008, 02:40 AM   #2
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Yes the oil can make th belts slip, could be super charger oil....have a look at your front snout seal on the sc.......any seepage near the bottom?

Also it could be an older belt that needs replacing, you might also want to consider an oversize belt tensioner, it helps with pulley wrap and prevents slippage.
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Old 05-02-2008, 11:38 AM   #3
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could it just be pulley wrap if there is no oil coming from the sc. i still cant find were the oil on the back of the a/c compressor is coming from, i guess ill have to do some more searching.
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Old 05-02-2008, 07:11 PM   #4
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cleaning the engine real good will help you find leaks.

Are you running a 715 belt with your 3.5" pulley?
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Old 05-02-2008, 10:41 PM   #5
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yes i am
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Old 05-03-2008, 02:31 AM   #6
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Almost forgot the obvious here, hows the belt tensioner?
Mine was bad and I got a good used one from Haro a while back.
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Old 05-03-2008, 09:53 AM   #7
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The A/C compressor front seal may be failing. There is oil in the A/C system to keep the compressor lubricated. Oil seen around A/C fittings is usually indicative of a leak. The higher rpm could aggravate the bad seal creating a momentary spray of freon/oil onto the belt causing the slip. Your initial analysis is a good one, imo.
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