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| | | Joined: Jul 2010 Posts: 127 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2010 Posts: 127 | '59 235/3200 what is the correct pressure cap for this motor? 3#-4#. Thanks in advance for your time.
Jessica's TruckThe true definition of insanity: To do the same thing the same way repeatedly and expect a different result each time. | | | | | Joined: Nov 2005 Posts: 6,100 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 6,100 | Hy Village_Idiot, I believe they are supposed to use a 7lb. cap, o.e.m. p/n 850795, however the Jim Carter catalog lists a 4lb. cap from 1947 - 59, so your guess is as good as mine. | | | | | Joined: Jul 2010 Posts: 127 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2010 Posts: 127 | Am I to understand correctly that the weak link here is the heater core and if I over-pressurize the system i risk damaging the heater core?
Jessica's TruckThe true definition of insanity: To do the same thing the same way repeatedly and expect a different result each time. | | | | | Joined: Feb 2004 Posts: 29,771 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,771 | The heater core is a concern, but some of the early-style radiators don't work well with higher-pressure caps, also. I'd consider a 7# cap to be a maximum. Every pound of pressure raises the boiling point of the coolant 3 degrees, so going from a 4# to a 7# cap only gives you 9 degrees of extra boil-over protection.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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| | | | | Joined: Jul 2001 Posts: 3,887 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Jul 2001 Posts: 3,887 | the heater core is one of the weak links, as is the rad [especially the tank seams] - the hoses may be the weakest link, depending on how old they are .... a 59 should be able to easily handle a 7# if everything is in good condition and that's what was original
Bill | | | | | Joined: Jul 2010 Posts: 127 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2010 Posts: 127 | Thanks for the reply. I will try a 7#. The rad and hoses are new so no worries there. Just wanted to be sure I wasn't putting unnecessary stress on the system.
Jessica's TruckThe true definition of insanity: To do the same thing the same way repeatedly and expect a different result each time. | | |
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