What's That Sound-Belt-Idler? (1 Viewer)

[lcjockey]

Any ideas what this sound might be coming from? Seems to be coming from the belt area more left side by oil dipstick, not the fan. I'm thinking its something with the belt, tensioner, idler. May be hard to hear in video but overall sounds like a rough spinning sound. Original belt 130K miles. Appreciate your input! Thanks

 

[bloc]

You need to get a mechanic's stethoscope in there to narrow it down. It could be any of the following: idler, tensioner, fan bearing bracket, water pump, AC compressor pulley, PS pump, alternator

As it is with 130k I'd strongly consider doing idler, tensioner, belt, and maybe bearing bracket as PM anyway.

 

[lcjockey]

You need to get a mechanic's stethoscope in there to narrow it down. It could be any of the following: idler, tensioner, fan bearing bracket, water pump, AC compressor pulley, PS pump, alternator

As it is with 130k I'd strongly consider doing idler, tensioner, belt, and maybe bearing bracket as PM anyway.

Thank you! Just for curiosity sake if AC compressor would I hear when AC off? I don’t hear any groaning when wheels are turned full lock. Trying to be somewhat educated going into this. Thanks again!

 

[bloc]

Thank you! Just for curiosity sake if AC compressor would I hear when AC off? I don’t hear any groaning when wheels are turned full lock. Trying to be somewhat educated going into this. Thanks again!

Yeah, if it's the AC pulley it can make noise even with it off.

The pulley itself spins any time the belt is being rotated, and that pulley rides on a bearing mounted on the nose of the compressor. There is also an electrically activated clutch that actually transmits power into the compressor when desired.. that is the part that you'll see stopped if the AC is off. That is mounted on a shaft that goes through the center of the nose and pulley bearing, to the compressor internals.

But the main pulley bearing is being stressed whether the AC clutch is engaged or not.

 

[lcjockey]

Yeah, if it's the AC pulley it can make noise even with it off.

The pulley itself spins any time the belt is being rotated, and that pulley rides on a bearing mounted on the nose of the compressor. There is also an electrically activated clutch that actually transmits power into the compressor when desired.. that is the part that you'll see stopped if the AC is off. That is mounted on a shaft that goes through the center of the nose and pulley bearing, to the compressor internals.

But the main pulley bearing is being stressed whether the AC clutch is engaged or not.

Makes perfect sense. I forgot it's all on the same belt. I'll have it looked at and do the belt, tensioner, and idler as PM. Thanks for your help!