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Pump Noise

Forum: C3 HVAC, Fuel, Emissions, and Exhaust

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Pump Noise

Posted: 8/20/08 2:17pmMessage 1 of 10
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82delight
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Joined: 8/9/2005
Posts: 66
Vette(s): 82 dark red

I installed a new water pump, but it sounds like bad bearings when I turn on the AC. I replaced the pump, and the noise is the same. I noticed the AC drive belt vibrating too much at idle, so I tightened it more, but I think it is too tight.  It stopped some of the noise, but not all.  I tightened the alternator, too, but I don't want to add any more belt tension.  I am ruling out water pump bearings.  Thoughts?

 

 

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Pump Noise

Posted: 8/20/08 6:30pmMessage 2 of 10
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kstyer
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CUYAHOGA FALLS, OH - USA
Joined: 12/2/2003
Posts: 6424
Vette(s): 1975 C3 Red, T-Tops, Black Interior. All I need is time and money! Getting there!
Use a dowl rod, such as a long wooden stick.  Touch the rod to the alt, pump, etc, one at a time, and place  your ear on the side of the rod.  The noise will transfer up the you can hear the source when touching different things.    DON'T stick the end of the rod in your ear, just in case something bounces and shoves it into your ear.   If you can't pinpoint the noise, spray some water or WD40 on the belt and see if it goes away for a moment.    WD40 last longer than the water will, but still goes away fairly quickly.    Do not use belt dressing or any oil.
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Pump Noise

Posted: 8/20/08 7:12pmMessage 3 of 10
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Adams' Apple
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 22715
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas
Did ya have this noise before replacing the w/p?

Joel Adams
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

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Pump Noise

Posted: 8/20/08 8:33pmMessage 4 of 10
B
BKVETTE
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Calhoun City, MS - USA
Joined: 9/24/2005
Posts: 121
Vette(s): 1977 Black T-Top
check for loose or cracked pully on harmonic balancer
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Pump Noise

Posted: 8/20/08 8:50pmMessage 5 of 10
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rraider1
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Woodland, WA - USA
Joined: 10/14/2003
Posts: 1171
Vette(s): 1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion
are sure it is not the AC clutch since you only have the noise with the AC on
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Pump Noise

Posted: 8/21/08 4:33amMessage 6 of 10
j
jbs82vette
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Mint Hill, NC - USA
Joined: 10/25/2007
Posts: 123
Vette(s): 1982 White Corvette, dark blue leather interior, 70,000 miles
How about the smog pumpQuestion
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Pump Noise

Posted: 8/21/08 8:47amMessage 7 of 10
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aceinthehole
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Manteca, CA - USA
Joined: 11/20/2005
Posts: 3623
Vette(s): 1978,two tone,Metalic Rootbeer & gold 1975 L48 4 speed
Kenny made a good point. The harmonic balancer, when deteriorating, can slip into the timing cover and sound like anything and everything.

Jimmy B.
Just can't wait to get on the road again.

 
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Pump Noise

Posted: 8/21/08 11:06amMessage 8 of 10
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Adams' Apple
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Duncanville, TX - USA
Joined: 11/8/2003
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Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas
All the more reason to determine when the noise started.
The way I originally read it, the noise started after the WP install...but...what if the WP was replaced because of the noise, but the noise is still there?
More info is needed...

Joel Adams
C3VR Lifetime Member #56    
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(click for Texas-sized view!)             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

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Pump Noise

Posted: 8/21/08 7:07pmMessage 9 of 10
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aceinthehole
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Manteca, CA - USA
Joined: 11/20/2005
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Vette(s): 1978,two tone,Metalic Rootbeer & gold 1975 L48 4 speed

You go Joel !Thumbs%20Up

Jimmy B.
Just can't wait to get on the road again.

 
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Pump Noise

Posted: 8/21/08 7:16pmMessage 10 of 10
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Adams' Apple
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 22715
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas
sssshhhhhh.....I'm goin right now!

Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

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