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8/20/08 4:17pm - Original Message: 'Pump Noise'
82delight
Former Member
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Vette(s):
82 dark red

Joined: 8/9/2005
Posts: 66

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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8/20/08 8:30pm - Reply: 'Pump Noise'
kstyer Lifetime Member
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CUYAHOGA FALLS, OH - USA

Vette(s):
1975 C3 Red, T-Tops, Black Interior. All I need is time and money! Getting there!

Joined: 12/2/2003
Posts: 6410
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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On the "Tail of the Dragon"
(some day, no strike that, October 2008 it turned red, still in progress!)

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8/20/08 9:12pm - Reply: 'Pump Noise'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

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

Joined: 11/8/2003
Posts: 19458
Did ya have this noise before replacing the w/p?

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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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8/20/08 10:33pm - Reply: 'Pump Noise'
BKVETTE
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Calhoun City, MS - USA

Vette(s):
1977 Black T-Top

Joined: 9/24/2005
Posts: 121
check for loose or cracked pully on harmonic balancer

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Kenny P   '77 L82 Black on Black Vette

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8/20/08 10:50pm - Reply: 'Pump Noise'
rraider1
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Woodland, WA - USA

Vette(s):
1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion

Joined: 10/14/2003
Posts: 1152
are sure it is not the AC clutch since you only have the noise with the AC on

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Bob R
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8/21/08 6:33am - Reply: 'Pump Noise'
jbs82vette
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Mint Hill, NC - USA

Vette(s):
1982 White Corvette, dark blue leather interior, 70,000 miles

Joined: 10/25/2007
Posts: 123
How about the smog pumpQuestion

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8/21/08 10:47am - Reply: 'Pump Noise'
aceinthehole Lifetime Member
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Valley Springs, CA - USA

Vette(s):
1978,Metalic Money Green W/Gold emblems,TH350 w/gear splitter,black & grey interior.1978,two tone,Metalic Rootbeer & gold ,Doeskin interior,auto. trans. 1981, Silver w/mirrored T-Tops,4 spd, charcoal interior.

Joined: 11/20/2005
Posts: 3618
Kenny made a good point. The harmonic balancer, when deteriorating, can slip into the timing cover and sound like anything and everything.

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

 
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8/21/08 1:06pm - Reply: 'Pump Noise'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

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

Joined: 11/8/2003
Posts: 19458
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...

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Joel Adams
C3VR Lifetime Member #56    
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             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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8/21/08 9:07pm - Reply: 'Pump Noise'
aceinthehole Lifetime Member
Lifetime Member
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Valley Springs, CA - USA

Vette(s):
1978,Metalic Money Green W/Gold emblems,TH350 w/gear splitter,black & grey interior.1978,two tone,Metalic Rootbeer & gold ,Doeskin interior,auto. trans. 1981, Silver w/mirrored T-Tops,4 spd, charcoal interior.

Joined: 11/20/2005
Posts: 3618

You go Joel !Thumbs%20Up



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

 
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8/21/08 9:16pm - Reply: 'Pump Noise'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

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

Joined: 11/8/2003
Posts: 19458
sssshhhhhh.....I'm goin right now!



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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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