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[GMCnet] Figured out how to count water pump impeller blades while pump is installed on engine [message #329006] Fri, 09 February 2018 23:54 Go to next message
BobDunahugh is currently offline  BobDunahugh   United States
Messages: 1690
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 12
Senior Member
I'd really like to make sure that my engine water pump is correct. Pulling it out to check isn't on my list of favorite things to do. Was looking at a new water pump. If I pull the 3/4" hose off the top of the water pump housing. My inspection camera can be put down that water port to count the impellers as I rotate the shaft. Bob Dunahugh
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Re: [GMCnet] Figured out how to count water pump impeller blades while pump is installed on engine [message #329008 is a reply to message #329006] Sat, 10 February 2018 06:05 Go to previous messageGo to next message
Ken Henderson is currently offline  Ken Henderson   United States
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Registered: March 2004
Location: Americus, GA
Karma: 41
Senior Member
Bob,

Is your engine running hot? Or is its temperature well controlled at all
ambient temperatures?

I've run 'most every WP configuration at one time or another, including
running them backward with a serpentine belt with both modified and
unmodified housings. The last one I ran on the 455 was an emergency
replacement from AutoZone, caused by on-the-road failure of a reverse-flow
prototype from Leigh Harrison. I never noticed any difference in cooling
with ANY of them, even while monitoring with the digital readouts on the
EFI computer.

There have always been other things I could worry about more effectively, I
guess.

Ken H.


On Sat, Feb 10, 2018 at 12:54 AM, Bob Dunahugh wrote:

> I'd really like to make sure that my engine water pump is correct. Pulling
> it out to check isn't on my list of favorite things to do. Was looking at
> a new water pump. If I pull the 3/4" hose off the top of the water pump
> housing. My inspection camera can be put down that water port to count the
> impellers as I rotate the shaft. Bob Dunahugh
> _______________________________________________
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
Re: [GMCnet] Figured out how to count water pump impeller blades while pump is installed on engine [message #329023 is a reply to message #329006] Sat, 10 February 2018 10:35 Go to previous messageGo to next message
BobDunahugh is currently offline  BobDunahugh   United States
Messages: 1690
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 12
Senior Member
This 78 Royale is running about 10 degrees hotter then our last 78 Royale. I know that this radiator is corroded inside from what I saw with my inspection camera. And since I'm putting the electrically controlled fan clutch on along with a radiator, and new harmonic dampener. Nice time to do anything in that area. Then sometimes I pull a 9,000 lbs trailer with the 403. Might as well check out the water pump. I know the pump isn't my problem. But GM did think the 6 blade pump could help. Bob Dunahugh


________________________________
From: Bob Dunahugh
Sent: Friday, February 9, 2018 11:54 PM
To: gmclist-AT-list-DOT-gmcnet-DOT-org
Subject: Figured out how to count water pump impeller blades while pump is installed on engine


I'd really like to make sure that my engine water pump is correct. Pulling it out to check isn't on my list of favorite things to do. Was looking at a new water pump. If I pull the 3/4" hose off the top of the water pump housing. My inspection camera can be put down that water port to count the impellers as I rotate the shaft. Bob Dunahugh
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Re: [GMCnet] Figured out how to count water pump impeller blades while pump is installed on engine [message #329031 is a reply to message #329023] Sat, 10 February 2018 12:37 Go to previous message
Tom Lins is currently offline  Tom Lins   United States
Messages: 160
Registered: February 2004
Location: Elkton, FL
Karma: 0
Senior Member
BobDunahugh wrote on Sat, 10 February 2018 11:35
This 78 Royale is running about 10 degrees hotter then our last 78 Royale. I know that this radiator is corroded inside from what I saw with my inspection camera. And since I'm putting the electrically controlled fan clutch on along with a radiator, and new harmonic dampener. Nice time to do anything in that area. Then sometimes I pull a 9,000 lbs trailer with the 403. Might as well check out the water pump. I know the pump isn't my problem. But GM did think the 6 blade pump could help. Bob Dunahugh


________________________________
From: Bob Dunahugh
Sent: Friday, February 9, 2018 11:54 PM
To: gmclist-AT-list-DOT-gmcnet-DOT-org
Subject: Figured out how to count water pump impeller blades while pump is installed on engine


I'd really like to make sure that my engine water pump is correct. Pulling it out to check isn't on my list of favorite things to do. Was looking at a new water pump. If I pull the 3/4" hose off the top of the water pump housing. My inspection camera can be put down that water port to count the impellers as I rotate the shaft. Bob Dunahugh
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I have to agree with Ken, The 78 we had with a 403 ran hot until I replaced the radiator with an aluminum radiator. Once that was in the coach the temp would go up to the thermostat temp and sit there, it never went any higher no matter the load. It did not budge going up the 20 mile 6% grade into the Bighorns in Wyoming. The corroded radiator is most likely the issue. JMHO


Tom Lins
Elkton, FL
77 GM Rear Twin, Dry Bath, 455
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