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yup Posted by JimBlake [Email]  (#141)  [Profile/Gallery]
(more from JimBlake) on Wed, 29 May 2002 08:46:57
In Reply to: Re: torque?, Mr. Science, Tue, 28 May 2002 21:42:11 Members do not see ads below this line. - Help Keep This Site Online - Signup |
OK... first, the theoretical stuff.
I think you got it right, each belt & pulley only knows about how much load is carried by that belt itself, and its RPM. In order to DUPLICATE the condition, you need to duplicate both. To duplicate mechanical load on the belt, you have to duplicate the electrical load on the alternator. To duplicate RPM vs. time without actually launching the car up a hill, you need to control the gas pedal differently, not just mash it & zing the tach. Now, this is all theoretical BS, but since you mentioned your engineering education, I thought you might be interested. If its a slipping belt, it should slip even more if you just mash the pedal & zing it, since the rate of change of RPM is greater.
Now then, what to do...
You've tightened some belts, now you can't duplicate the noise just by revving the engine. If you feel like eliminating all possibilities, loosen all the belts way loose or take them off. Check for sloppyness in each pulley, by grabbing & trying to rattle it. Alternator, waterpump, AC clutch, AC idler, PS pump, & crank pulley... None of them should 'rattle' sideways or axially, including loose brackets as well as bearings. They should all be parallel to each other, otherwise something is bent. Each one should turn smoothly, except the crank, which shouldn't turn at all (unless you actually turn the crankshaft). Re-tighten the belts. While you're down there, put a chalk mark across the crank pulley to check that.
I'd still like to see you locate the sound, clutch vs. belts. Maybe somebody can stand next to the car while you actually pull away. If you still can't make the noise, maybe its actually fixed...
If its up in the clutch, think about this... I once had a noisy throw-out bearing that sounded a bit like a belt squeal, but quieter. It was more of a rattling noise when the clutch was engaged, more squeaky when I just began to load it by pressing the clutch pedal. It got quiet when it was carrying its full thrust load, when the clutch pedal was down all the way. Just an example to say that a T/O bearing can make funny noises under different conditions.
BTW, I agree with Eric & Randy; since you need the clutch to make the noise, its probably related to the clutch.
posted by 131.184.14...
, Tue, 28 May 2002 14:33:45, Tue, 28 May 2002 17:14:38, Wed, 29 May 2002 08:46:57 <-- Viewing This Message
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