Noise from Idler bearing...

akhilesh · 6th September 2011, 15:29

Quote:

Originally Posted by abhipuru16

Compressor Clutch maybe?

But the noise should reduce if I switch off the AC but that doesn't happen. Intensity of noise remains same no matter if the AC is ON or OFF. Moreover why the noise subsides when with the new bearing momentarily is what I fail to understand :(

mgh · 6th September 2011, 22:56

idler pulley is used
1. to increase belt contact area
2. to easily adjust belt tension
belt can give noise
if tension is low.
or contact area is less (design problem in Indicas initially)
Usually, belt noise would be heard, when the engine is started first time in the morning, and then go away.
Physical inspection of the belt would tell you whether it needs to be changed. It would also need to be changed (rarely), if it has stretched so much that you cannot get the belt tension needed.
Bearing noise would be more persistent and change with engine speed.

dot · 6th September 2011, 23:00

Quote:

Originally Posted by akhilesh

There's a kat-kat sound which is really annoying and grows louder as the engine gets warmer.

it was found that the noise vanishes when AC belt is removed.

Took it to MASS where it was found that its the bearing again after replacing it noise was gone again but only momentarily.

It could be a belt noise too. Would it be possible to change the belt and check for noise. Does the WagonR come with a hydraulic belt tensioner? That could be another part to look into. Hope this helps.

akhilesh · 7th September 2011, 12:34

Its a new belt and its not a screeching noise which comes due to loose belt. Its a metal kat-kat sound which is typically of a bearing.

Could this be due to alignment which is causing the bearing to go bad ?

akhilesh · 27th September 2011, 16:26

Quote:

Originally Posted by akhilesh

Its a new belt and its not a screeching noise which comes due to loose belt. Its a metal kat-kat sound which is typically of a bearing.

Could this be due to alignment which is causing the bearing to go bad ?

Just for an update so that it can benefit others facing similar issue. The noise is finally gone. I replaced the belt and told my mechanic to keep it a little loose and bingo the noise was no longer there

. So there could be 2 things, either the belt was the culprit or it was simply the tension tha was applied on the belt

Its is surprising that it was such a small fix and MASS was speculating a complete engine rebuild

6th September 2011, 22:56	#17
mgh BHPian Join Date: Jun 2010 Location: Bangalore Posts: 396 Thanked: 40 Times	Re: Noise from Idler bearing... idler pulley is used 1. to increase belt contact area 2. to easily adjust belt tension belt can give noise if tension is low. or contact area is less (design problem in Indicas initially) Usually, belt noise would be heard, when the engine is started first time in the morning, and then go away. Physical inspection of the belt would tell you whether it needs to be changed. It would also need to be changed (rarely), if it has stretched so much that you cannot get the belt tension needed. Bearing noise would be more persistent and change with engine speed.
	() Thanks

7th September 2011, 12:34	#19
akhilesh BANNED Join Date: Mar 2007 Location: New Delhi Posts: 297 Thanked: 340 Times	Re: Noise from Idler bearing... Its a new belt and its not a screeching noise which comes due to loose belt. Its a metal kat-kat sound which is typically of a bearing. Could this be due to alignment which is causing the bearing to go bad ?
	() Thanks