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I would like to ask for help if someone has met this before.
Symptoms: after an engine compartment has warmed up, about 10-15 miles, the whistling will only be clearly audible around 2000 rpm somewhere around the belts / a fan. The intensity of the sound is directly proportional to the engine speed. After the engine has cooled down, it no longer manifests itself, as does by idling. This only occurs when the engine is warm and rpm are around 200.
It’s started to show after replacing a radiator and all belts (before less than 70 miles). We have tried to tighten the belts, but the tension seems to be fine.
I hope, that they are right:
A/C CMPR_____ AC DELCO 17560
GENERATOR___AC DELCO 15541
P/S PUMP_____AC DECLo 15360
AIR PUMP_____Dayco Top Cog Engine Timing Belt 15315 11A0800 11-A-0800
Originally Posted by KenSny
Does the pitch of the whistle change if you loosen a belt?
Today it was the first attempt to solve this issue, we tried to change a tightening of A/C CMPR and GEN belts, used a little suitable oil and the whistle was gone. But after another 15 miles it was back. I guess that the reason whay the whistle missed was cooling engine / pulley, instead of our effort.
Are the belts siting to high or to low in the pulley grove is the next thing I'd check.
Then I would loosen up one belt at a time and see if the whistle stops.
From: Loud, Raw and Dangerous 1968 327 4S in Southern California
Also check the alignment from pulley to pulley on your belts. My alternator pulley was too far forward and causing belt noise until I corrected it. Belt should be straight and not at any angle between the two.
Hearing things like this is why I switched my 1968 427 to a ""Serpentine" belt system. Some of the widths of the original belts have been discontinued and the ones I need for my 1968 Corvette were all among those belts. It got so bad I carried spares in the storage box behind the passenger. The Power Steering hose was my worst offender as it would always start squealing after 500 miles or less.
I have a Marche Serpentine Conversion and I love how clean it makes the front of the engine. I find it much easier to get the right size serpentine than finding the correct belts that would last on the old pulleys.
All the original parts and pulleys are in a box in my garage in case someone wants to re-install the old style belts and pulleys. I don't want to make any permanent changes so the next owner might have some fun making it original again.
C3 1982 - something whistle
