My 51 two ton dump has a 7 pound cap. It might not be correct for it, though. I
have a 235 in my 50 and had to cut the water pump shaft some and the new pump
had
a diiferent bolt pattern for the fan, so I am not running a fan, now. When it
warms up around here, I will need it, I know. The only pulley I could find in my
junk pile was a Ford pulley and the diameter is not quite twice of the original.
It runs cooler with a slower turning pump and who knows maybe a milage increase,
as well.
New Mexico Jim
"dph55@pdq.net" wrote:
> Original equipment on AD trucks were not high pressure radiator caps and did
> not operate at todays boiling temperatures. I think that up to a point they
> were non pressure caps and ran at 180 degrees or less as the norm. I'm not
> sure when the pressure thing started but something tells me that the first
> ones were around 2.5 to 3 psi. The old ones ran a lot farther from the edge of
> boiling when everything was right. If one of the oldies boils in just a short
> time of running at any speed I would be flushing engine, radiator and checking
> thermostat in a pan of water with an accurate thermometer. The cooling system
> in my 51 is certainly not as marginal as the one in my 1997 model. I don't
> think the water pumps were built to handle pressures like we see today either.
>
> Dave Handley
> 51 GMC 5 window
>
> oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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