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Old 08-28-2016, 10:54 PM
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Join Date: Apr 2000
Posts: 75
duxthe... It's not that I don't believe you, I'm just not fully convinced! It did the same thing with the OLD and NEW water pumps installed.

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Old 08-29-2016, 07:52 PM
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Join Date: Jan 2012
Posts: 7,489
Originally Posted by 79300D View Post
97 SL320.. Interestingly the water seems to make a difference sometimes, but because of the intermittent nature of the noise, it is hard to tell if it actually doing anything. I actually replaced the only smooth pulleys, the water pump pulley and tensioner...
Adding water ( if you add enough ) would make an instant change as soon as it hits the belt. If it doesn't, the problem isn't the belt / flat pulley.

Another thought, is the fan rubbing the shroud?

I've had good alternators make a whining / whistle magnetic noise that increases with electrical load.

Given you have changed a bunch of stuff and the noise stops when the belt is off, the likely hood of something flying off is low so I'd say drive it and check once in a while. Also please post a final result if you find out what happened.
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Old 08-29-2016, 09:15 PM
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Join Date: Apr 2000
Posts: 75
The fan is clear of the shroud. Even with my stethoscope I still cant pin it down which is what irritates me the most. I really didn't mind replacing the "front of the engine" parts; at least I know they are good, and I believe I saved myself from water pump destruction. DUXTHE may be right, it may be the new water pump seal, but its just too coincidental that it did it before I changed over the pump and I don't like coincidence.

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