lapaul
NAXJA Forum User
- Location
- los angeles
My idler pulley for the serpentine belt on my 90 xj self destructed yesterday.
First smoke and screeching noise. I pulled over and by the time I opened the hood the smoke was gone, and I couldn't tell where it had come from.
A knocking noise continued and when I pulled to my driveway the thing went crazy with a metal against metal noise.
When I got to look the idler pulley was no longer centered on the bolt
instead there was a large space between the interior of the pulley and the outside.
When I got a new one I could see that the interior bushings with I assume some ball bearings had disintergrated, and disappeared.
I was wondering what could have caused this self destruction.
My best guess is that the rubber bushings had gotten old and cracked, that this created a small off center wobble that heated up and burned the bushings, creating more of a wobble and more heat, until the whole internal bushings peeled away.
The reason I think this is what happened, is because seizing up of the bushing wouldhave had no adverse effect since it ordinarily doesn't move and the interior metal bearing around the bolt was fine.
Any thoughts.
First smoke and screeching noise. I pulled over and by the time I opened the hood the smoke was gone, and I couldn't tell where it had come from.
A knocking noise continued and when I pulled to my driveway the thing went crazy with a metal against metal noise.
When I got to look the idler pulley was no longer centered on the bolt
instead there was a large space between the interior of the pulley and the outside.
When I got a new one I could see that the interior bushings with I assume some ball bearings had disintergrated, and disappeared.
I was wondering what could have caused this self destruction.
My best guess is that the rubber bushings had gotten old and cracked, that this created a small off center wobble that heated up and burned the bushings, creating more of a wobble and more heat, until the whole internal bushings peeled away.
The reason I think this is what happened, is because seizing up of the bushing wouldhave had no adverse effect since it ordinarily doesn't move and the interior metal bearing around the bolt was fine.
Any thoughts.