Water pump replacement...what else? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BugzC10 · 04-30-2016, 03:54 PM

I'm going to replace my water pump...it started sqeaking and I see a drizzle from the weep hole. Anything else I should consider checking and or replacing since I will have it apart? Lower radiator hose..yes. ...Upper is new....Radiator is new. Pulleys all new. Thermal fan clutch is new. Thermostat is new..180 deg. Heater hoses are new. Harmonic balancer is new.
It's original 307 and I don't know the mileage or how well it was maintained before I got it. Runs great, no smoke. Mild cam with roller tip rockers, fresh rebuilt stock heads.

davepl · 04-30-2016, 04:33 PM

Belts!

BugzC10 · 04-30-2016, 06:26 PM

yes...Forgot to mention...belts are all new.

pwdcougar · 04-30-2016, 06:36 PM

If you dig a little deeper you can do the timing chain!

Paul

BugzC10 · 04-30-2016, 06:55 PM

I did think of timing chain, but didn't want to say it out loud.

I don't drive it that much, but when I do, I put my foot in it. (307 style) it would be my luck, I would finish the water pump then the timing chain would fail.
Can I get away with lowering the oil pan enough to r&r the timing chain cover without replacing a fairly new one piece oil pan gasket?

Shady Rascal · 05-01-2016, 09:22 AM

Don't automatically condemn the timing chain.

Remove your distributor cap and using a socket on the harmonic balancer, turn the engine forward and back to see how much rotation your can turn the crank before the distributor rotor will move. That gives you an idea of how much slack is in the timing chain and gears.

BugzC10 · 05-01-2016, 12:34 PM

Thanks for the tip...great idea!

Chknlyps2 · 05-01-2016, 03:03 PM

When you pull off your old pump you can look in the water jacket openings to see how much crud build up there is and decide if you need to flush your system. I have heard good and bad about using vinegar to flush with. If you think you might need to flush the system you may want to do it before you take the old pump off that way you are not circulating crap through the new pump.

BugzC10 · 05-01-2016, 05:52 PM

Thanks for the suggestion...I did a flush before I replaced my radiator last year.

04-30-2016, 03:54 PM	#1
BugzC10 Registered User Join Date: Oct 2012 Location: Green Valley Arizona Posts: 1,351	Water pump replacement...what else? I'm going to replace my water pump...it started sqeaking and I see a drizzle from the weep hole. Anything else I should consider checking and or replacing since I will have it apart? Lower radiator hose..yes. ...Upper is new....Radiator is new. Pulleys all new. Thermal fan clutch is new. Thermostat is new..180 deg. Heater hoses are new. Harmonic balancer is new. It's original 307 and I don't know the mileage or how well it was maintained before I got it. Runs great, no smoke. Mild cam with roller tip rockers, fresh rebuilt stock heads. __________________ 1970 C10 Short Stepper with 71/72 front clip. Last edited by BugzC10; 04-30-2016 at 06:27 PM.

04-30-2016, 04:33 PM	#2
davepl Registered User Join Date: Aug 2006 Location: Redmond, WA Posts: 6,332	Re: Water pump replacement...what else? Belts! __________________ 1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible

04-30-2016, 06:26 PM	#3
BugzC10 Registered User Join Date: Oct 2012 Location: Green Valley Arizona Posts: 1,351	Re: Water pump replacement...what else? yes...Forgot to mention...belts are all new. __________________ 1970 C10 Short Stepper with 71/72 front clip.

04-30-2016, 06:36 PM	#4
pwdcougar Registered User Join Date: Oct 2013 Location: New Jersey Posts: 1,302	Re: Water pump replacement...what else? If you dig a little deeper you can do the timing chain! Paul __________________ "You know that little thing in your head that keeps you from saying things you shouldn't? Yeah well, I don't have one of those" 1969 Mercury Cougar Standard 4 speed 1969 Mercury Cougar XR7 convertible 1970 4WD Chevrolet Suburban 1997 4WD Chevrolet Silverado Extended Cab Short Bed (purchased new January 1997)

04-30-2016, 06:55 PM	#5
BugzC10 Registered User Join Date: Oct 2012 Location: Green Valley Arizona Posts: 1,351	Re: Water pump replacement...what else? I did think of timing chain, but didn't want to say it out loud. I don't drive it that much, but when I do, I put my foot in it. (307 style) it would be my luck, I would finish the water pump then the timing chain would fail. Can I get away with lowering the oil pan enough to r&r the timing chain cover without replacing a fairly new one piece oil pan gasket? __________________ 1970 C10 Short Stepper with 71/72 front clip.

05-01-2016, 09:22 AM	#6
Shady Rascal Registered User Join Date: Feb 2016 Location: Weatherford Texas Posts: 306	Re: Water pump replacement...what else? Don't automatically condemn the timing chain. Remove your distributor cap and using a socket on the harmonic balancer, turn the engine forward and back to see how much rotation your can turn the crank before the distributor rotor will move. That gives you an idea of how much slack is in the timing chain and gears.

05-01-2016, 12:34 PM	#7
BugzC10 Registered User Join Date: Oct 2012 Location: Green Valley Arizona Posts: 1,351	Re: Water pump replacement...what else? Thanks for the tip...great idea! __________________ 1970 C10 Short Stepper with 71/72 front clip.

05-01-2016, 03:03 PM	#8
Chknlyps2 Registered User Join Date: Feb 2016 Location: Anza, CA Posts: 160	Re: Water pump replacement...what else? When you pull off your old pump you can look in the water jacket openings to see how much crud build up there is and decide if you need to flush your system. I have heard good and bad about using vinegar to flush with. If you think you might need to flush the system you may want to do it before you take the old pump off that way you are not circulating crap through the new pump.

05-01-2016, 05:52 PM	#9
BugzC10 Registered User Join Date: Oct 2012 Location: Green Valley Arizona Posts: 1,351	Re: Water pump replacement...what else? Thanks for the suggestion...I did a flush before I replaced my radiator last year. __________________ 1970 C10 Short Stepper with 71/72 front clip.



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