12-22-2009 | #1 |
Join Date: Jul 2005
Location: Atlanta, GA
Posts: 81
|
Thickness of water pump gasket??
Ok, so I put the new water pump on and torque the bolts down. Go to spin the pulley and it won't budge at all!
So, I take it all back apart and put the old and new side by side on the bench. The impeller is within 1/32" but the gasket thickness between what was on there and what was included with the new pump is 1/16" thinner on the new one! I pulled a spare gasket down and it's just a bit thicker than the new one but still thinner than the original. Anyone know what the original ACDelco gasket's thickness is?
__________________
1991 Chevrolet Corvette ZR-1 |
12-23-2009 | #2 |
Join Date: Jul 2005
Location: Atlanta, GA
Posts: 81
|
Re: Thickness of water pump gasket??
Are those ACDelco gaskets?
It looks like the one on there is 3/32" (compressed). .09" is twice the thickness of yours.
__________________
1991 Chevrolet Corvette ZR-1 |
12-23-2009 | #3 |
Join Date: Feb 2009
Location: Alexandria, Virginia
Posts: 1,467
|
Re: Thickness of water pump gasket??
I'm getting ready to do the water pump on mine. When I get home tonight I will have to measure the gasket that came in the box.
Rich
__________________
1990 Bright Red Coupe #608 380 Stroker, Ported Heads/Intake/Housings/TB Haibeck Secondary Delete Chip / Pete's Cams George Braml Intake / FIC Injectors Coated SW Headers / Corsa Bill Boudreau B/B ZF6 / Viper 4.10 gears Ron Davis Radiator Pioneer AVIC-Z140BH NAV Fikse FM5's 285 / 335 / C6 Brakes WAZOO Member |
12-23-2009 | #4 |
Join Date: Jul 2005
Location: Atlanta, GA
Posts: 81
|
Re: Thickness of water pump gasket??
Scrrem, is your pump an AC Delco also?
__________________
1991 Chevrolet Corvette ZR-1 |
12-23-2009 | #5 |
Join Date: Feb 2009
Location: Alexandria, Virginia
Posts: 1,467
|
Re: Thickness of water pump gasket??
Not sure. It's a rebuilt unit, is there a way to distinguish an AC Delco unit?
Rich
__________________
1990 Bright Red Coupe #608 380 Stroker, Ported Heads/Intake/Housings/TB Haibeck Secondary Delete Chip / Pete's Cams George Braml Intake / FIC Injectors Coated SW Headers / Corsa Bill Boudreau B/B ZF6 / Viper 4.10 gears Ron Davis Radiator Pioneer AVIC-Z140BH NAV Fikse FM5's 285 / 335 / C6 Brakes WAZOO Member |
12-23-2009 | #6 | |
Join Date: Dec 2003
Location: Arcadia,OK
Posts: 3,394
|
Re: Thickness of water pump gasket??
Quote:
Here are dimensions taken from a used, OEM pump. Measure yours & maybe we can locate the problem. With rebuilt pumps, there are an array of possibilities that could cause the pump to bind on installation. Once rebuilt, it no longer matters if it says AC Delco on the pump. A. diameter of the impeller : 3.857" B. height from pump flange to back of the impeller : 0.175" D. height of impeller hub from back of impeller : 0.160" E. used oem pump gasket : 0.044" current thickness (note, new gaskets will compress when installed and have some "rebound" when removed) est uncompressed thickness, 0.049". Compression & rebound depends on the composition of the gasket material. Jerry
__________________
Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 ZR-1, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed. Last edited by A26B; 12-23-2009 at 11:45 AM. |
|
12-23-2009 | #7 | |
Join Date: Dec 2003
Location: Arcadia,OK
Posts: 3,394
|
Re: Thickness of water pump gasket??
Quote:
I think the problem is going to be in the rebuilt pump.
__________________
Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 ZR-1, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed. |
|
12-23-2009 | #8 |
Join Date: Jul 2005
Location: Atlanta, GA
Posts: 81
|
Re: Thickness of water pump gasket??
My .093" is as close as I could measure because it's still stuck to the old pump. I can't mic it. I can't remove the gasket because it just deteriorates in my hand.
I'll get more accurate measurements tonight when I get back home. I appreciate all the help guys! I just want to isolate where the problem is. By the sounds of Dynomite's dry fit of his pump, it is looking like mine is way out of tolerance.
__________________
1991 Chevrolet Corvette ZR-1 |
12-23-2009 | #9 |
Join Date: Jul 2004
Location: Kalamazoo MI
Posts: 1,754
|
Re: Thickness of water pump gasket??
does your pump spin freely in your hand?
Im sure it does but when you installed it the propeller is binding against the front engine cover so thats a problem, perhaps it wasnt pressed all the way on and is sticking out jut enough. Its a tight fit in there anyway.
__________________
JOHNNY P Currently own 90 ZR-1 #845 DRM 500 engine package 90 #226 Parts car Hit me up if you need anything. |
12-23-2009 | #10 |
Join Date: Jul 2005
Location: Atlanta, GA
Posts: 81
|
Re: Thickness of water pump gasket??
It does spin in my hand, just when it's torqued to the engine, it seizes up. If I loosen the bolts and spin it, it scrapes against the block. Something ain't right with it!
__________________
1991 Chevrolet Corvette ZR-1 |
Thread Tools | |
Display Modes | |
|
|