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Water pump pressure to the water heater [message #290613]

Fri, 20 November 2015 00:36

The Dr

Messages: 75
Registered: July 2014
Location: Toledo, OR

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Wondering what the water pressure would be from the engine back to water heater in the preheat hoses. Haven't been able to find it in the documentation. If someone knows where, please point me to it.

Thanks,

Mike Sauer Toledo, OR 1975 26' Avion 1-ton front end, SullyBilt AirBag System, 3.21 tranny

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Re: [GMCnet] Water pump pressure to the water heater [message #290614 is a reply to message #290613]

Fri, 20 November 2015 00:39

James Hupy

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Registered: May 2010

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Senior Member

Should be what the radiator cap is, minus a bit for hose restriction.
Jim Hupy
On Nov 19, 2015 10:37 PM, "Mike Sauer" wrote:

> Wondering what the water pressure would be from the engine back to water
> heater in the preheat hoses. Haven't been able to find it in the
> documentation. If someone knows where, please point me to it.
>
> Thanks,
>
> --
> Mike Sauer
> Toledo, OR
> 1975 26' Avion
> 1-ton front end, SullyBilt AirBag System, 3.21 tranny
>
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Re: Water pump pressure to the water heater [message #290615 is a reply to message #290613]

Fri, 20 November 2015 00:53

Ken Burton

Messages: 10030
Registered: January 2004
Location: Hebron, Indiana

Karma: 10

Senior Member

The water pressure caused by pumping is almost ZERO. It takes next to no difference in pressure to move coolant through the closed (recirculating) cooling system. That said, the entire cooling system is pressurized by the expansion caused engine heating the coolant. The entire system pressure is regulated by the radiator cap. In the GMC the normal pressure is around 9 PSI. For any pressure higher than that, the pressure will be relieved by the radiator cap with the excess coolant being sent to the coolant overflow bottle.

Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana

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Re: Water pump pressure to the water heater [message #290669 is a reply to message #290615]

Sat, 21 November 2015 09:39

Bullitthead

Messages: 1411
Registered: November 2013

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What Ken said...exactly.

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

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Re: Water pump pressure to the water heater [message #290686 is a reply to message #290613]

Sat, 21 November 2015 19:48

Bob de Kruyff

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

Karma: 1

Senior Member

The Dr wrote on Thu, 19 November 2015 23:36

Wondering what the water pressure would be from the engine back to water heater in the preheat hoses. Haven't been able to find it in the documentation. If someone knows where, please point me to it.

Thanks,

The replies you got regarding cooling system pressure has no effect on what you are asking about. You want the differential pressure which is created by the inlet vs outlet water pump pressure.

Bob de Kruyff
78 Eleganza
Chandler, AZ

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Re: [GMCnet] Water pump pressure to the water heater [message #290692 is a reply to message #290686]

Sat, 21 November 2015 21:44

USAussie

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

Karma: 6

Senior Member

Bob,

I think that you would have to connect a PSID gage to the fitting in the intake manifold that feeds the dash heater and water
heater:

http://www.gmcmhphotos.com/photos/engine-cooling-photos/p47661-dash-house-heater-connection.html

And the fitting that this hose connects to:

http://www.gmcmhphotos.com/photos/aa-miscellaneous-photos/p59583-engine-water-pump.html

Unfortunately I don't know which is the high side (supply to dash heater and house water heater) or low side (return to engine).

Regards,
Rob M.
The Pedantic Mechanic

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

The replies you got regarding cooling system pressure has no effect on what you are asking about. You want the differential pressure
which is created by the inlet vs outlet water pump pressure.
--
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: [GMCnet] Water pump pressure to the water heater [message #290694 is a reply to message #290692]

Sat, 21 November 2015 22:26

The Dr

Messages: 75
Registered: July 2014
Location: Toledo, OR

Karma: 0

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Well, I thought someone might have gone before, where I am trying to go. Smile

Nine psi was what I guessed without any experience to back it up. With Jim's and Ken's experience I think I am satisfied.

Thanks again, everyone.

Mike Sauer Toledo, OR 1975 26' Avion 1-ton front end, SullyBilt AirBag System, 3.21 tranny

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