Water pump replacement. - ZR-1 Net Registry Forums

rhipsher · 04-17-2011

I finally got some time to pull the water pump off and get ready to put the new one on before the Texas weather turns brutally hot. If any of you have to do this I highly highly recommend that you when you receive your new water pump that you take the gasket that comes with it and make a template out of cardboard and place each bolt you take out in it one at a time so you know where they go when you put them back in. Half of them are all different lengths.

Also don?t forget about the one bolt that goes throught the A/C compressor through to the water pump which means removing the alternator which requires moving the plenum out of the way. Which blows booty hole for just one bolt. But it is what it is. Now im just waiting for my blue Samco radiator hose kit to arrive and finish it up.

ittlfly · 04-17-2011

Just a little confused here. I didn't quite follow as to why you had to pull the plenum. I R&R'ed my alternator last month without pulling the plenum.....just the air horn and TB.

rhipsher · 04-17-2011

This bolt is why.

I could get a 10mm open end wrench on it from the front but could not break it loose. And there's no room to get a socket or ratchet on it unless you do it from the top. You still have to remove the alternator to get a socket on it. That's why. Sure you can remove the air horn and tb but I chose to just move the plenum aside.

ittlfly · 04-17-2011

Thanks for the picture. I wonder just how much they paid their GM enginering wizard to put that bolt in the worst possible location.

A26B · 04-17-2011

Rick,
You can save yourself a little trouble by putting the bolts in the proper hole in the new water pump on the bench, as you remove them from the old pump on the engine. Then, after the old pump is off, put it on the bench beside the new one & transfer the bolts over to the old pump & reinstall the new pump accordingly.

Jerry :-)

rhipsher · 04-17-2011

Quote:

Originally Posted by A26B

Rick,
You can save yourself a little trouble by putting the bolts in the proper hole in the new water pump on the bench, as you remove them from the old pump on the engine. Then, after the old pump is off, put it on the bench beside the new one & transfer the bolts over to the old pump & reinstall the new pump accordingly.

Jerry :-)

True that. But see now my daughters think daddy's an awesome free hand artist. The couldn't believe how perfect I drew that gasket sketch.

USAFPILOT · 04-17-2011

you also risk the chance your kids come along and play with the bolts

rhipsher · 04-17-2011

They are old enough now that they know better.

bdw18_123 · 04-18-2011

Thanks for posting those two pics of the waterpump bolts, rhipsher! The previous owner of course just mixed them all up on mine. So those pics along with Jerry's bolt info will help me get them sorted out.

A26B · 04-18-2011

This may help a bit more than the list. I added the quantity & length values.

04-17-2011	#1
rhipsher Join Date: Aug 2008 Location: Houston 90 Red ZR-1 Posts: 2,320	Water pump replacement. I finally got some time to pull the water pump off and get ready to put the new one on before the Texas weather turns brutally hot. If any of you have to do this I highly highly recommend that you when you receive your new water pump that you take the gasket that comes with it and make a template out of cardboard and place each bolt you take out in it one at a time so you know where they go when you put them back in. Half of them are all different lengths. Also don?t forget about the one bolt that goes throught the A/C compressor through to the water pump which means removing the alternator which requires moving the plenum out of the way. Which blows booty hole for just one bolt. But it is what it is. Now im just waiting for my blue Samco radiator hose kit to arrive and finish it up. Last edited by rhipsher; 04-17-2011 at 06:34 PM.

04-17-2011	#2
ittlfly Join Date: Jul 2009 Location: Redding Calif Posts: 223	Re: Water pump replacement. Just a little confused here. I didn't quite follow as to why you had to pull the plenum. I R&R'ed my alternator last month without pulling the plenum.....just the air horn and TB. __________________ 1994 ZR-1 # 0102...SOLD

04-17-2011	#3
rhipsher Join Date: Aug 2008 Location: Houston 90 Red ZR-1 Posts: 2,320	Re: Water pump replacement. This bolt is why. I could get a 10mm open end wrench on it from the front but could not break it loose. And there's no room to get a socket or ratchet on it unless you do it from the top. You still have to remove the alternator to get a socket on it. That's why. Sure you can remove the air horn and tb but I chose to just move the plenum aside. Last edited by rhipsher; 04-17-2011 at 07:35 PM.

04-17-2011	#4
ittlfly Join Date: Jul 2009 Location: Redding Calif Posts: 223	Re: Water pump replacement. Thanks for the picture. I wonder just how much they paid their GM enginering wizard to put that bolt in the worst possible location. __________________ 1994 ZR-1 # 0102...SOLD

04-17-2011	#5
A26B Join Date: Dec 2003 Location: Arcadia,OK Posts: 3,372	Re: Water pump replacement. Rick, You can save yourself a little trouble by putting the bolts in the proper hole in the new water pump on the bench, as you remove them from the old pump on the engine. Then, after the old pump is off, put it on the bench beside the new one & transfer the bolts over to the old pump & reinstall the new pump accordingly. 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.

04-17-2011	#7
USAFPILOT Join Date: Aug 2007 Location: Spring TX Posts: 1,347	Re: Water pump replacement. you also risk the chance your kids come along and play with the bolts

04-17-2011	#8
rhipsher Join Date: Aug 2008 Location: Houston 90 Red ZR-1 Posts: 2,320	Re: Water pump replacement. They are old enough now that they know better.

04-18-2011	#9
bdw18_123 Join Date: Apr 2009 Location: Prather, CA Posts: 809	Re: Water pump replacement. Thanks for posting those two pics of the waterpump bolts, rhipsher! The previous owner of course just mixed them all up on mine. So those pics along with Jerry's bolt info will help me get them sorted out. __________________ [IMG]http://i13.photobucket.com/albums/a292/bdw18_123/_zr1netforumsigphoto.jpg[/IMG][B] 1990 Corvette ZR-1 [/B][I] White/Flame Red, #2299, mostly stock, 144K miles.[/I] -Cams timed to the '93-'95 405HP LT5 stock timing. -IAT sensor relocated to below front bumper. -Haibeck hoops installed in airduct. -OBX cat-back exhaust. [COLOR=DarkRed][B](SOLD - December 2012 [/B][/COLOR][COLOR=DarkRed][B]:hello:)[/B][/COLOR] 1993 Corvette Coupe Black/Black, 6-speed (SOLD - October 2009 :hello:)

04-18-2011	#10
A26B Join Date: Dec 2003 Location: Arcadia,OK Posts: 3,372	Re: Water pump replacement. This may help a bit more than the list. I added the quantity & length values. __________________ 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; 03-15-2020 at 10:52 AM.*