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Old 03-15-2010, 12:17 AM   #1 (permalink)
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Rear mounted radiator?

I will be working on my truck soon now that the weather is in my favor, and due to my design, there is no room for a radiator under the hood. My main question is how does the extra 'load' on the water pump effect it? Will the length of hose from front of engine to rear of cab, and the raised radiator put too much strain on a stock water pump? Engine is a 400 w/ stock water pump...
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Old 03-15-2010, 12:23 AM   #2 (permalink)
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stock water pump will work fine.
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Old 03-15-2010, 08:11 AM   #3 (permalink)
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Agreed...have done several crawlers now with the radiator in the back. Have yet to have an issue with water pumps...but bleeding the air out of it when you first fire it up sometimes sucks.
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Old 03-15-2010, 12:58 PM   #4 (permalink)
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Drilling a 1/16'' hole in the Tstat helps the filling and burping.
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Old 03-15-2010, 01:43 PM   #5 (permalink)
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I tried that, and without a T-stat at all....best way I found to do it was weld a nut to the highest point in the return tube in the engine compartment, screw in a petcock and force it out that way.
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Old 03-15-2010, 02:40 PM   #6 (permalink)
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My water pump has been fine for 5+ years running a rear radiator, like said the only biznatch is burping the system.
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Old 03-15-2010, 06:35 PM   #7 (permalink)
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stock pump is more than fine, if you're going to be seeing constant high rpm i do suggest slowing everything down with a smaller crank pulley, the factory pumps tend to move to much volume at the high rpms and as such the rad won't remove enough heat, and the result is a slow overheating condition. I did this on my race preped 400 and the thing doesn't get a hair over 180 when ticklin the 7k redline in the mud bogs.
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Old 03-16-2010, 02:48 AM   #8 (permalink)
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I tried that, and without a T-stat at all....best way I found to do it was weld a nut to the highest point in the return tube in the engine compartment, screw in a petcock and force it out that way.
Can you explain this a little further? I'm not quite sure I understand what you are describing. Any pics handy?
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Old 03-16-2010, 10:47 AM   #9 (permalink)
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I can take some pics today.....basically your gonna have some sort of tube attaching to the water neck and turning around to go back to the radiator right? All I did was make that tube bend up higher than the engine before it turned down and went under the body and back to the radiator. At the crown of the bend you drill a hole on the top side of it. Then get a petcock ( I used one for an air compressor), a nut that it will screw into, and some good pipe dope. Weld the nut over the hole, screw in the petcock and your done. Then open it up all the way, stick a garden hose in the radiator and force the water through the system with the engine running...as soon as you see water pissing out of the petcock hole, your almost done. Close it off and run it for awhile, every once in awhile open it up and let the steam out.
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Old 03-17-2010, 03:15 AM   #10 (permalink)
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Thanks a lot! I've got a pretty clear picture in my head now!
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