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Tank above radiator?
#1363006 Mon Jun 01 2020 11:13 AM
Joined: Oct 2012
Posts: 119
M
MFW Offline OP
'Bolter
1954 GMC470 has the tank above the radiator. Not exactly sure what the purpose is. When I started it up it was steaming out of the bottom opening because the plastic acorn was cracked. Do I replace the cap or bypass the tank?

Thanks
Matt

Attached Files
Re: Tank above radiator?
MFW #1363008 Mon Jun 01 2020 11:16 AM
Joined: Oct 2012
Posts: 119
M
MFW Offline OP
'Bolter
I have more pictures but I can only attach one. But this is the tank in the old fire truck. It’s not leaking from the valves just the spot where the plastic acorn came off. I was wondering if I can just find a cap to screw on and be done.

Matt

Re: Tank above radiator?
MFW #1363013 Mon Jun 01 2020 11:58 AM
Joined: Nov 1995
Posts: 5,278
J
Unrepentant VW Lover
Matt -- Your truck is a fire truck? In the picture, the tank is off the truck ... Do/did the lines from this tank attach to *anything?* Like the pump, perhaps?


John

'49 Chevrolet 3804




Re: Tank above radiator?
MFW #1363020 Mon Jun 01 2020 12:44 PM
Joined: Oct 2012
Posts: 119
M
MFW Offline OP
'Bolter
Yes, the water pump goes into the bottom of the tank and the top of the tank goes in to the radiator.

Re: Tank above radiator?
MFW #1363021 Mon Jun 01 2020 12:44 PM
Joined: Oct 2012
Posts: 119
M
MFW Offline OP
'Bolter
Yes fire truck. The tank can be removed and a regular radiator hose from pump to radiator would fit. Not sure what it’s for just don’t want to mess anything up. I figured it there for a purpose and I like to keep my trucks the way they were.

Matt

Attached Files
Last edited by MFW; Mon Jun 01 2020 01:09 PM.
Re: Tank above radiator?
MFW #1363031 Mon Jun 01 2020 02:43 PM
Joined: Nov 1995
Posts: 5,278
J
Unrepentant VW Lover
Did it have any lines running anywhere else? To the pump, for example? It could be a heat exchanger to help keep the coolant cooler during stationary pumping in hot weather, and to keep the pump from freezing in cold weather.

Hopefully one of the more knowledgeable fire truck guys will chime in here.

On your images, you should be able to attach 5 to each post. You have to select each image individually to attach it. And then hit "Done"


John

'49 Chevrolet 3804




Re: Tank above radiator?
MFW #1363039 Mon Jun 01 2020 03:14 PM
Joined: May 2017
Posts: 349
S
'Bolter
Yes, it almost certainly is a heat exchanger as John said. Engine coolant would flow through one set of connections without going anywhere else. The other pair of connections would be plumbed to the fire pump with heater size hoses to cool the engine. It is useless on a truck without a pump and generally a trouble spot for leaks.

If you do not have a fire pump, get rid of it. If you do have a fire pump, get rid of it. It will be a constant source of leaks and of no operational value unless you pump for a long time at a big fire. I am gonna guess that is unlikely.


Mac :{)

1962 K10 short step side, much modified for rally
1969 T50 fire truck, almost nos, needs a few things
Re: Tank above radiator?
MFW #1363072 Mon Jun 01 2020 07:54 PM
Joined: Oct 2012
Posts: 119
M
MFW Offline OP
'Bolter
It’s a grain truck now with all the left overs remaining. I want to go through an eliminate the miles and miles of wire and the dual battery setup. But, we have it running and stopping today. I think the brakes are grabbing a bit without pushing the pedal.


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