Originally Posted by Small Dealer
The fix may be a simple as the balance shaft chain tensioner being reset or replaced. Especially if the noise was not present previously.
Originally Posted by AZDarkSol
I still have the final service repair ticket, here's what they found.
"Whinning noise from front engine area-history concern with water pump.
Noise from front of engine appears to be new water pump. Replaced pump-noise still present-remove belts -test with chassis ears to help isolate -cause still present-test with engine ears listening tool-noise at w/pump area. Remove front cover for access-no visual sign for noise. Inspect balance shaft-no failure-replaced internal pump sprocket for water pump-reassemble and retest- noise gone. Reassembled front cover. Refill cooling system and roadtested 6 miles to verify noise is gone and operation is as designed upon completion of repairs. "
They could not even see the damage to the sprocket, it was that insignificant to the eye, but the damage was there and was generating the noise. They replaced the sprocket and it was quiet again.
To inspect the balance shafts, they probably removed them. This means that the tensioner was removed, and during reinstallation it was reset. So that may have fixed the noise, if it was the cause, while they replaced the sprocket also.
Here is the tensioner. It must be removed before removing the chain, which would be required if going deeper into the engine or replacing something chain driven.
Originally Posted by Swendor
The noise was not present previously. This should be fixed free of charge, correct?
Would definately believe it should be redone by the shop. They may have their policy on "warranty" repairs posted or on your RO.
Originally Posted by AZDarkSOl
There may be a service bulletin out on this by now. This was all done well over a year ago with no problems or noise since.
No service bulletin, but service information about this possibility has been around since 2005, of course at that point the Solstice would not have been listed, but other EcoTecs could have been, although may have been just a Saturn message. Something that could be overlooked, even though the service manual should have had warnings about requiring the tool usage.
The 2005 service information has been very recently updated, that is why it was top of mind and the original hijack post was made.
The GM essential tool has a $230+ list cost. Here is a picture of a version of the tool: