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Old 07-30-2008   #1 (permalink)
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Unanswered: whine under the hood

hi, i have a stock 73 opel gt with an automatic tranny. As the engine turns past 4600 RPM's, a loud whine develops under the hood. Anyone know what this could be?? It happens all the time while driving. I've only tried it once while on neutral and it made the noise. I was scared to try more that way cause i think i read somewhere that revving the engine too high without load is bad.
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Old 07-30-2008   #2 (permalink)
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Originally Posted by gtowner1265 View Post
hi, i have a stock 73 opel gt with an automatic tranny. As the engine turns past 4600 RPM's, a loud whine develops under the hood. Anyone know what this could be?? It happens all the time while driving. I've only tried it once while on neutral and it made the noise. I was scared to try more that way cause i think i read somewhere that revving the engine too high without load is bad.
Your water pump may be going bad. Revving the engine too high anytime can be bad, but I wouldn't worry about 4800 RPM's.
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Old 07-30-2008   #3 (permalink)
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Originally Posted by gtowner1265 View Post
hi, i have a stock 73 opel gt with an automatic tranny. As the engine turns past 4600 RPM's, a loud whine develops under the hood. Anyone know what this could be?? It happens all the time while driving. I've only tried it once while on neutral and it made the noise. I was scared to try more that way cause i think i read somewhere that revving the engine too high without load is bad.
Sounds like a slipping alternator belt. Try tightening the belt a little - not too much since that's bad for the alternator and water pump bearings.
I had that too above 3000 RPM a while ago, and that fixed it.

Dieter
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Old 07-31-2008   #4 (permalink)
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Question 5- or 7-bladed fan?

Try things already mentioned . . . another thought, 5- or 7-bladed WP fan? 7-bladed fans are particularly noisy, high pitched whine, at higher RPMs! . . . nature of the beast, I'm afraid.
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Old 07-31-2008   #5 (permalink)
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Provided Answers: 1
Try isolating the noise using a 2 or 3 ft length of hose as a stethoscope
holding one end to an ear and searching for the source. Have someone rev the engine
while you're doing it. This might be kind of scary.

Last edited by tekenaar; 07-31-2008 at 11:55 AM. Reason: your
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