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Engine Accessory Noise - Help !

MK19

By MK19
in 996 TT, 996 TT S, 996 GT2

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MK19 Member

MK19

Posted
Posted

Help,

I'm noticing a Gear Whine like noise from my engine bay.

 

It does not seem the be the screech that you'd get from the power steering pump/reservoir bypass valve - as per the Service Bulletin, it is no affected by temperature or by engaging the clutch.

 

It sounds like gear whine from the transmission or differential, but it occurs when not moving too, and at about 2000 rpm's. The noise is gone above or below that speed, so I believe it to be one of the accessories but can isolate it.

 

It does not seem to be the A/C compressor, as the noise is there with the A/C on or off.

 

Could it be the Power Steering pump itself? Alternator? Or a drive belt idler bearing?

 

Any help is appreciated. Thanks.

MK

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JFP in PA Member

JFP in PA

Posted
  • Moderators
Posted

Help,

I'm noticing a Gear Whine like noise from my engine bay.

 

It does not seem the be the screech that you'd get from the power steering pump/reservoir bypass valve - as per the Service Bulletin, it is no affected by temperature or by engaging the clutch.

 

It sounds like gear whine from the transmission or differential, but it occurs when not moving too, and at about 2000 rpm's. The noise is gone above or below that speed, so I believe it to be one of the accessories but can isolate it.

 

It does not seem to be the A/C compressor, as the noise is there with the A/C on or off.

 

Could it be the Power Steering pump itself? Alternator? Or a drive belt idler bearing?

 

Any help is appreciated. Thanks.

MK

 

Try pulling the serpentine belt and briefly run the car (remember, without the belt, you have no cooling system), and see if the noise goes away.  If it does, shut the car off and start turning each of the driven systems to listen/feel for which one is causing the problem.

MK19 Member

MK19

Posted
  • Author
Posted

THANKS JFP!

Such obvious trouble shooting methodology......that I'm embarrassed to have been so lazy.

I found that the centermost idler bearing is the culprit........must be replaced. Great result that could have been so much more costly.

Thanks again!

MK19

  • Moderators
JFP in PA Member

JFP in PA

Posted
  • Moderators
Posted

THANKS JFP!

Such obvious trouble shooting methodology......that I'm embarrassed to have been so lazy.

I found that the centermost idler bearing is the culprit........must be replaced. Great result that could have been so much more costly.

Thanks again!

MK19

 

Glad to be of help, and that you got it sorted.

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