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Bought a water pump, 5" impeller, any thoughts ? [message #266873]

Fri, 28 November 2014 10:29

Loffen

Messages: 1087
Registered: August 2013
Location: Norway

Karma: 1

Senior Member

Theother day I did find a NOS water pump dirt cheap GM/Delco 231886 it is just over 5 1/2" and has a large 5" impeller.
From what I found out so is this for the old Olds 350 diesel but should fit my -73 455.

As the 350 diesel has a lower rpm band just as we have in the GMC with a larger impeller this could be (In my head ) a perfect fit or am I on the wrong track here ?

1973 23' # 1848 Sky Blue Glacier called Baby Blue and a 1973 26'-3 # 1460 Parrot green Seqouia Known as the Big Green, And sold my 1973 26'-2 # 581 White Canyon lands under the name Dobbelt trøbbel in Norway

[Updated on: Fri, 28 November 2014 15:40]

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Re: [GMCnet] Bought a water pump, 5" impeller, any thoughts ? [message #266874 is a reply to message #266873]

Fri, 28 November 2014 11:25

Mr ERFisher

Messages: 7117
Registered: August 2005

Karma: 2

Senior Member

Just this
http://gmcmotorhome.info/watpump.html
Erf

On Friday, November 28, 2014, Espen Heitmann wrote:

> Theother day I did find a NOS water pump dirt cheap GM/Delco 231886 it is
> just over 5 1/2" and has a large 5" impeller.
> From what I founf out so is this for the old Olds 350 diesel but should
> fit my -73 455.
>
> As the 350 diesel has a lower rpm band just as we have in the GMC with a
> larger impeller this could be (In my head ) a perfect fit or am I on the
> wrong track here ?
> --
> 1973 26'-3 # 1460 Parrot green Seqouia Known as the Big Mean Green Machine,
> And just sold my 1973 26'-2 # 581 White Canyon lands under the name
> Dobbelt trøbbel
> in Norway
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>

--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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Re: Bought a water pump, 5" impeller, any thoughts ? [message #266876 is a reply to message #266873]

Fri, 28 November 2014 11:59

Jp Benson

Messages: 649
Registered: October 2011
Location: Fla

Karma: 2

Senior Member

The doc in this link specifically recommends against using the 231886.

http://www.bdub.net/publications/GMC_Motorhome_Maintenance_and_Information_Notes.pdf

JP

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Re: [GMCnet] Bought a water pump, 5" impeller, any thoughts ? [message #266877 is a reply to message #266873]

Fri, 28 November 2014 12:42

powerjon

Messages: 2446
Registered: January 2004

Karma: 5

Senior Member

Unknown if it would fit as the stock pump is a 4 1/4” diameter impeller. Here is some info on the pumps and possible reverse rotation pumps for those that want to use the serpentine belt setups.

http://www.gmcmhphotos.com/photos/olds-water-pumps/p33910-olds-455-standard-rotation-pump.html
http://www.gmcmhphotos.com/photos/olds-water-pumps/p33909-monte-carlo-reverse-rotation-pump.html
http://www.gmcmhphotos.com/photos/olds-water-pumps/p32921-130-1360.html
http://www.gmcmhphotos.com/photos/olds-water-pumps/p32920-130-1240.html

JR Wright
78 Buskirk Stretch
75 Avion
Michigan

> On Nov 28, 2014, at 11:29 AM, Espen Heitmann wrote:
>
> Theother day I did find a NOS water pump dirt cheap GM/Delco 231886 it is just over 5 1/2" and has a large 5" impeller.
> From what I founf out so is this for the old Olds 350 diesel but should fit my -73 455.
>
> As the 350 diesel has a lower rpm band just as we have in the GMC with a larger impeller this could be (In my head ) a perfect fit or am I on the
> wrong track here ?
> --
> 1973 26'-3 # 1460 Parrot green Seqouia Known as the Big Mean Green Machine,
> And just sold my 1973 26'-2 # 581 White Canyon lands under the name Dobbelt trøbbel
> in Norway
>
> __
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan

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Re: [GMCnet] Bought a water pump, 5" impeller, any thoughts ? [message #266878 is a reply to message #266873]

Fri, 28 November 2014 13:19

USAussie

Messages: 15912
Registered: July 2007
Location: Sydney, Australia

Karma: 6

Senior Member

Espen,

I would suggest purchasing a gasket for a 455 water pump and see if fits the pump you have found.

Regards,
Rob M.
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426

-----Original Message-----
From: Espen Heitmann

The other day I did find a NOS water pump dirt cheap GM/Delco 231886 it is just over 5 1/2" and has a large 5" impeller.
From what I founf out so is this for the old Olds 350 diesel but should fit my -73 455.

As the 350 diesel has a lower rpm band just as we have in the GMC with a larger impeller this could be (In my head ) a perfect fit
or am I on the wrong track here ?

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Regards, Rob M. (USAussie) The Pedantic Mechanic Sydney, Australia '75 Avion - AUS - The Blue Streak TZE365V100428 '75 Avion - USA - Double Trouble TZE365V100426

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Re: Bought a water pump, 5" impeller, any thoughts ? [message #266879 is a reply to message #266873]

Fri, 28 November 2014 14:29

Jp Benson

Messages: 649
Registered: October 2011
Location: Fla

Karma: 2

Senior Member

It appears that the 231886 was used on vehicles without A/C.
The table below shows one application for the Olds 455.

http://www.oldsmobility.com/oldsmo/viewtopic.php?f=6&t=391

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Re: Bought a water pump, 5" impeller, any thoughts ? [message #266883 is a reply to message #266873]

Fri, 28 November 2014 20:00

Bob de Kruyff

Messages: 4260
Registered: January 2004
Location: Chandler, AZ

Karma: 1

Senior Member

Loffen wrote on Fri, 28 November 2014 09:29

Theother day I did find a NOS water pump dirt cheap GM/Delco 231886 it is just over 5 1/2" and has a large 5" impeller.
From what I found out so is this for the old Olds 350 diesel but should fit my -73 455.

As the 350 diesel has a lower rpm band just as we have in the GMC with a larger impeller this could be (In my head ) a perfect fit or am I on the wrong track here ?

What's wrong with the standard pump? Spinning a low speed pump faster is not something you want to do.

Bob de Kruyff
78 Eleganza
Chandler, AZ

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Re: [GMCnet] Bought a water pump, 5" impeller, any thoughts ? [message #266884 is a reply to message #266883]

Fri, 28 November 2014 20:12

USAussie

Messages: 15912
Registered: July 2007
Location: Sydney, Australia

Karma: 6

Senior Member

C'mon Bob.

EVERYBODY knows that BIGGER is better! ;-)

Regards,
Rob M.
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426

-----Original Message-----
From: Bob de Kruyff

What's wrong with the standard pump? Spinning a low speed pump faster is not something you want to do.
--
Bob

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Regards, Rob M. (USAussie) The Pedantic Mechanic Sydney, Australia '75 Avion - AUS - The Blue Streak TZE365V100428 '75 Avion - USA - Double Trouble TZE365V100426

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Re: Bought a water pump, 5" impeller, any thoughts ? [message #266885 is a reply to message #266873]

Fri, 28 November 2014 20:35

Bullitthead

Messages: 1411
Registered: November 2013

Karma: 5

Senior Member

Going to look at mine and compare it to this one tomorrow:
http://www.autozone.com/external-engine/water-pump/valucraft-reman-water-pump/198358_0_0/
Would like to carry a spare with me that I already know fits since there seem to be so many variations, and auto parts stores that can't look up parts for a GMC without jumping to the truck chassis.

Terry Kelpien ASE Master Technician 73 Glacier 260 Smithfield, Va.

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Re: [GMCnet] Bought a water pump, 5" impeller, any thoughts ? [message #266935 is a reply to message #266885]

Sun, 30 November 2014 09:04

Mr ERFisher

Messages: 7117
Registered: August 2005

Karma: 2

Senior Member

Read here
http://gmcws.org/Tech/Engine_Cooling_System_Basics_-_Steve_Ferguson.pdf

On Friday, November 28, 2014, Terry wrote:

> Going to look at mine and compare it to this one tomorrow:
>
> http://www.autozone.com/external-engine/water-pump/valucraft-reman-water-pump/198358_0_0/
> Would like to carry a spare with me that I already know fits since there
> seem to be so many variations, and auto parts stores that can't look up
> parts
> for a GMC without jumping to the truck chassis.
> --
> Terry Kelpien
> ASE Master Technician
> 73 Glacier 260
> Smithfield, Va.
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>

--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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Re: [GMCnet] Bought a water pump, 5" impeller, any thoughts ? [message #266941 is a reply to message #266935]

Sun, 30 November 2014 11:15

Dave Mumert

Messages: 272
Registered: February 2004
Location: Olds, AB, Canada

Karma: 0

Senior Member

Hi All

According to Rockauto there are two different pumps for the 455.
The Airtex part for a motor with A/C is AW1120, it is 5.95" mounting face to pulley face.
The Airtex part for a motor without A/C is AW 1100 it is 5.57" mounting face to pulley face.

I looked up the Delco 231886 it appears to cross to the AW 1100, if that is true the pump is about 3/8" too short..

Dave Mumert

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