Hi all,

This problem has been driving me nuts for the last 3 months or so. Only started happening around November last year. Car drives absolutely fine otherwise, plenty of power, shifts fine, everything is working as expected.

The issue is a whine noise as the engine is revving, especially noticeable from 1500-3000rpm.

So far I have changed both idler pulleys, the tensioner, power steering pump and the noise is still there. I don't think its the alternator or waterpump but I'm getting close to taking it into a local indy to diagnose.

Video here:


Any idea what the noise might be?

 

You can poke around with a dowl rod or mechanic's stethoscope to better pinpoint the source of the noise.

 

I did try that which is why I thought its the powering steering. But will give it another go

 

Still winning...

• new/rebuilt steering pump
• new serp idlers
• new serp tensioner

what gives??

-- double check pulley alignement ... MB uses a "walking pulley" on the water pump.

-- Any foaming by steering pump (inlet seal leak)

-- Do replace CONTINENTAL belt !!

-- Check accessories for freeplay

-- flush steering system oil for all fresh.
Last get a better quality steering pump.

 

I think it is the water pump.




Water pump pulley is getting the smooth side of the serpentine belt, not the ribbed part ( V groove ) which has better friction.

Also make sure your serpentine belt is good one if not genuine.
I read somewhere, some belts are not good when loaded on the smooth side, must be loaded at the ribs or V groove.

Take a peek at the water pump pulley, see any sign of abrasion from extra friction ?
Shake2 water pump pulley too.

 

did you ever figure out the issue? I have the same thing

 

Yeah I made a video about fixing it actually, its the air con compressor pulley

 

thanks - I actually have the m272 engine but I thinks it’s the same replacement procedure

 

Next time when you find the problem, update your post before anyone need to ask.
That is the minimum courtesy you should provide the post/topic.

Anyway good finding