Replaced Old Belts
Melting Slicks
Joined: Oct 2006
Posts: 2,417
Likes: 336
From: Texas
they make belts that are a little wider so they grab the pulley better, also check your pulleys, slipping belts tend to wear them down in the groove, so the belt has a harder time gripping as it rides further down in the groove..
Le Mans Master
Joined: Jan 2006
Posts: 6,506
Likes: 139
From: Butler Pa
There's a couple reasons why the belts would slip.
They're too loose.
They're the wrong size (too narrow) and riding on the flat surface at the bottom of the pulley groove.
Either the alternator or PS pump is siezing up creating too much drag.
They're too loose.
They're the wrong size (too narrow) and riding on the flat surface at the bottom of the pulley groove.
Either the alternator or PS pump is siezing up creating too much drag.
Melting Slicks
Joined: Jun 2009
Posts: 2,709
Likes: 3
From: Savannah GA
Look at the pulleys themselves. The groove should have smooth sides ending in a sharp edged flat at the bottom. If there's a step, or the sides are wavy, or the bottom is not flat and "blends" into the side, the pulleys are worn out and will need replacement. A new belt in an unworn pulley should ride very near flush with the pulley edge.
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Brett Foote
Race Director
Joined: Dec 1999
Posts: 11,096
Likes: 990
From: Sierra Foothills CA
Look at the pulleys themselves. The groove should have smooth sides ending in a sharp edged flat at the bottom. If there's a step, or the sides are wavy, or the bottom is not flat and "blends" into the side, the pulleys are worn out and will need replacement. A new belt in an unworn pulley should ride very near flush with the pulley edge.
I just cured a squealing problem I fought off and on for years by getting a Goodyear Gatorback belt for my 69 Vette. The width is bigger than those belts you find at most parts stores and the belt rides even with the top of the pulley now. It's a #15xxx series belt- the 15 pertains to the width, which is 7/16". The last 3 numbers pertain to the length. They're a bit more expensive but are well worth it. 