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Re: How much vibration is acceptable on the tensioner Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Tue, 29 Jun 2004 05:58:35
In Reply to: How much vibration is acceptable on the tensioner, Petre Astrom, Mon, 28 Jun 2004 13:20:24 Members do not see ads below this line. - Help Keep This Site Online - Signup |
I have just replaced idler pulleys and the tensioner, and I compared the vibration before and after.
I see about 1/8 inch of movement at the tensioner pulley bolt. It's normal to see a slight jump when the compressor kicks in or drops out, but the movement should be about the same, AC on or off. The movement I see is pretty slow - about synchronized to one rotation of the belt. I take this to be due to slight belt variations.
Faster vibration would be due to pulley/bearing issues - the vibration would be keyed to the rotation of the pulley, which is faster for smaller pulleys.
If you can physically move the AC compressor, then that's way too loose. Vibration stops not because you're tensioning the belt more - the tensioner does a fine job of that - the vibration is due to misalignment of the pulleys. This causes nibbling of the belt at the edges of the pulleys.
First - secure that compressor! I doubt the water pump bolts need torquing - If the pump were moving enough to show up as belt vibration, it would be leaking coolant to beat the band. Second, see how the belt tracks on the tensioner idler pulley. The belt should run right in the middle of that pulley, with a little bit of pulley face showing on both sides of the belt. The belt shouldn't wander on the pulley.
Theoretically it could be a bad bearing on any accessory - water pump, PS pump, or alternator. You should be able to hear that. My guess is belt misalignment. That can be because the AC compressor is loose. It could be bad idler pulley bearings. Don't ignore the main (crankshaft) pulley, AKA Harmonic Balancer. If the rubber sandwich fails there, the outside of the pulley will drift in relationship to the inside - this will cause misalignment of the belt and vibration.
posted by 192.249....
, Tue, 29 Jun 2004 05:58:35 <-- Viewing This Message, Tue, 29 Jun 2004 10:07:37
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