whine under the hood

gtowner1265 · 07-30-2008

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.

opelwasp · 07-30-2008

Originally Posted by gtowner1265

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.

BMWonly · 07-30-2008

Originally Posted by gtowner1265

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

tekenaar · 07-31-2008

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.

Aardvaark · 07-31-2008

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.

07-30-2008	#1 (permalink)
gtowner1265 Opeler Join Date: Feb 2005 Location: Riverside, CA Posts: 9	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.

07-31-2008	#4 (permalink)
tekenaar Cunning Linguist Join Date: Mar 2002 Location: Plano, TX 75074 Posts: 4,441 Real Name: Otto Provided Answers: 13	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. __________________ 1960: ♥ '61 Rekord PII 1.7 3S 3.9 ♥ '69 Kadett LS 'sprint' 1.9 3A 3.18 1970: ♥ '70 GT 1.9 4S 3.44 ♥ '72 GT 2.2SSD 5S 3.44 ♥ '72 GT 2.4FI 5S 3.44P ♥ '73 GT 1.9FI 4S 3.44 ♥ '75 1900 1.9FI 4S 3.44 1980: ♥ '85 Bitter SC 3.9FI 5S 3.44P 2000: ♥ '09 Solstice GXP Coupe 2.0 SIDI VVT Turbo 5S 3.73P

07-31-2008	#5 (permalink)
Aardvaark UFO pel abductee. Join Date: Aug 2007 Location: Des Moines, Iowa Posts: 2,242 Real Name: Mark Paar (not Parr) Provided Answers: 5	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. __________________ -Mark '75 Manta Direct link to my album of Opel related parts catalogs and magazine articles for reference: http://www.opelgt.com/photopost/show...ser/23031/sl/a Last edited by tekenaar; 07-31-2008 at 11:55 AM. Reason: your

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