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Re: Replaced serp belt & idler pulley - still have problems Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Wed, 4 Aug 2004 07:56:20
In Reply to: Replaced serp belt & idler pulley - still have problems, Cory, Tue, 3 Aug 2004 19:32:23 Members do not see ads below this line. - Help Keep This Site Online - Signup |
As others have mentioned, there are two idler pulleys - one is part of the tensioner, the other is just an idler. When you replaced the idler, how did the pulley bearings feel? If they were wobbly, then they were shot.
I had a similar problem with burning rubber smell. The serpentine belt is five basic components - the belt, the idler pulley, the tensioner pulley, the tensioner damper, and the main pulley (aka Harmonic Balancer). A problem with one affects all. Look at how the belt rides on the tensioner pulley. It should be right in the center. If it's riding off to one side, then suspect the main pulley. The main pulley (crankshaft or Harmonic Balancer) is actually two pulleys, one inside the other, with a rubber piece sandwiched inside. This provides vibration damping. After time, that sandwich can fail. I haven't heard of this on the 9-3, but the design is pretty much the same since the 900. If this rubber fails, the outer pulley will spin under load. This causes a burning rubber smell. Also, the outer portion (which carried the belt) will move inward or outward from the engine slightly, causing the belt to be misalgined. The belt can then rub on parts. To be sure, draw a chalk mark across the face of the main pulley. Start and run the engine, then shut it down. If the line is no longer straight, then the harmonic balancer needs replacment.
Lastly, there is a piston that tensions the belt and provides damping. That's the piston on the tensioner. With the engine running, look at the movement of the tensioner pulley. It's normal for it to wiggle a little (less thatn 1/8 inch). Watch as the A/C compressor kicks in and out. It may jump a little. If it jumps a lot, then the tensioner piston may be shot. Unlikely for a car of your vintage, but, there it is.
posted by 192.249....
, Wed, 4 Aug 2004 07:56:20 <-- Viewing This Message
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