rebuilding water pump ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

kenn · 03-12-2021, 05:40 PM

Hello, Does the shaft push out the front or the back of the casting?
I took the flange off to push it thru and out the back but I'm not sure that's the way it comes out.
Thanks. K.E.N.

kenn · 03-12-2021, 05:43 PM

sorry about that, its for a stock 72 pump.
K.E.N.

**truckdude239** · 03-12-2021, 07:08 PM

I dont want to come across as a smart head but why rebuild a water pump? They are cheap and you don't worry about it failing later cause every part is new

kipps · 03-13-2021, 08:32 AM

I also wouldn't bother rebuilding a water pump from one of these trucks. They're cheap and readily available. I priced out a water pump for a Deere 420, a 30-hp 1950's tractor, and was shocked at the $400 price. I bought a generic seal and shaft assembly for $50 and made it fit. I absolutely don't fault you though for wanting to attempt to disassemble it to see if you can. That's the best way to learn how stuff works. Sorry I'm no help on which way it comes out.

**AussieinNC** · 03-13-2021, 05:49 PM

Remove the rear steel plate from the back of the pump. Clean the maunting surface to remove any residual gasket.

Press off the mount that the fan pulley attaches to...

NOTE !

Before doing so, lay the pump on its back on a bench and measure the height of the pulley mount from the surface...write it down for future reference.

Place the back pump on the press plates with the opening in the press plates sufficient to allow the impeller to pass thru...

Press the old bearing and seal and impeller assembly out from front to back....

Clean up the bore of the housing and check well for corrosion and cracks....if you find any, junk the pump....

The new bearing is pressed in from the back then the seal is installed and finally the impeller is pressed on but not deep enough to lock against the housing...usually leave about 45 thou clearance.

Place a support on the back of the impeller shaft to stop the bearing being forced out backwards during the next step.

Place pump back down on press plate and install pulley flange to same height as originally measured...

Have fun...

kenn · 03-14-2021, 04:00 PM

Thank you Aussie that is what I wanted.
K.E.N.

03-12-2021, 05:40 PM	#1
kenn Registered User Join Date: Oct 2013 Location: CT. Posts: 260	rebuilding water pump ? Hello, Does the shaft push out the front or the back of the casting? I took the flange off to push it thru and out the back but I'm not sure that's the way it comes out. Thanks. K.E.N.

03-12-2021, 05:43 PM	#2
kenn Registered User Join Date: Oct 2013 Location: CT. Posts: 260	Re: rebuilding water pump ? sorry about that, its for a stock 72 pump. K.E.N.

03-12-2021, 07:08 PM	#3
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,217	Re: rebuilding water pump ? I dont want to come across as a smart head but why rebuild a water pump? They are cheap and you don't worry about it failing later cause every part is new __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

03-13-2021, 08:32 AM	#4
kipps Registered User Join Date: Jul 2014 Location: North-central Virginia Posts: 1,099	Re: rebuilding water pump ? I also wouldn't bother rebuilding a water pump from one of these trucks. They're cheap and readily available. I priced out a water pump for a Deere 420, a 30-hp 1950's tractor, and was shocked at the $400 price. I bought a generic seal and shaft assembly for $50 and made it fit. I absolutely don't fault you though for wanting to attempt to disassemble it to see if you can. That's the best way to learn how stuff works. Sorry I'm no help on which way it comes out. __________________ 1987 C6P V20 truck, 2010 LMG 5.3, AFM delete, 2010 Camaro exhaust manifolds, 1997 nv4500, 1991 np241c, hydroboost, 2005 14bff axle & driveshaft, drop-n-lock gooseneck, 4.10 gears, stock suspension, rims, and tires. Still a work in progress. Any questions or suggestions are welcome!

03-13-2021, 05:49 PM	#5
AussieinNC Moderator Join Date: Jun 2017 Location: Cherryville, NC Posts: 2,155	Re: rebuilding water pump ? Remove the rear steel plate from the back of the pump. Clean the maunting surface to remove any residual gasket. Press off the mount that the fan pulley attaches to... NOTE ! Before doing so, lay the pump on its back on a bench and measure the height of the pulley mount from the surface...write it down for future reference. Place the back pump on the press plates with the opening in the press plates sufficient to allow the impeller to pass thru... Press the old bearing and seal and impeller assembly out from front to back.... Clean up the bore of the housing and check well for corrosion and cracks....if you find any, junk the pump.... The new bearing is pressed in from the back then the seal is installed and finally the impeller is pressed on but not deep enough to lock against the housing...usually leave about 45 thou clearance. Place a support on the back of the impeller shaft to stop the bearing being forced out backwards during the next step. Place pump back down on press plate and install pulley flange to same height as originally measured... Have fun... __________________ Family and country before all others... 2006 Chevy Silverado (Daily Driver) 2012 Chevy Equinox

03-14-2021, 04:00 PM	#6
kenn Registered User Join Date: Oct 2013 Location: CT. Posts: 260	Re: rebuilding water pump ? Thank you Aussie that is what I wanted. K.E.N.



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