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
Figured out how to count water pump impeller blades while pump is installed on engine
- Thread starter Bob Dunahugh
- Start date
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.
> 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
> _______________________________________________
>
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.
> 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
> _______________________________________________
>
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
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
________________________________
From: Bob Dunahugh
Sent: Friday, February 9, 2018 11:54 PM
To: gmclist
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
> 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
> 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
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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
> 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
> 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
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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
