Who currently makes a presure relief valve for a original radiator? Looking for a part number or company that sells My radiator works and holds presure but I don't have a presure relief valve for it. Mine is original with relief valve where overflow comes out
Isn't that a "zero-pressure" radiator? That honeycomb design core will start springing leaks if more than about 4 PSI is applied to it. The vent canister can be disassembled and cleaned by rolling the crimp back on the top and soldering it back together after a cleanup, assuming you can find a radiator repairman who still remembers how to solder. Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt! There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway Love your enemies and drive 'em nuts!
It's a spring clip holding that cap on but the presure relief valve that goes inside is missing. Since this picture was taken had a small crack repaird and had it tested and passed but had to find a way to plug this hole to test
Put a rubber disc over the hole, backed by a VERY light weight spring. Sort of a one-way check valve. Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt! There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway Love your enemies and drive 'em nuts!
James: You didn't mention the year or model number of your truck. Some trucks came with (or had dealer installed) HD radiators that had the radiator pressure valve shown on the left side of the top tank in your picture. In that case the radiator cap would have a gasket that would not allow overflow at the radiator fill tube. The petcock on the right side of the top tank is to check coolant level. Listing below is for the pressure relief valve. GMC Maintenance Manual says the valve is set for 4 psi. There are a few paragraphs about the pressure valve in the Maintenance Manual, but it isn't rocket science. Let me know if you'd like me to scan and post them.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12 '52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
James Price Haven't seen one of those in a long time,that big radiator is really a powerful cooler my big chevy never offers to overheat with the same thing,except just the cap. Good luck with your fix . You know with that tall ( above the coolant) neck if it is pressure cap friendly couldn't you protect it there ?? Might need to install (sweat-in) an overflow tube with hose. Just a thought.
I bought an electronic copy ( .pdf file ) of the 39-53 GMC Light Duty Truck Master Parts Book from forum member SlimSix. Contact him via private message or maybe he will see this message and respond with current price info. Below is the 1st page.
Hey Andy, do I get a sales commission?
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12 '52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12 '52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
~ Dan 1951 Chevy 3 window 3100 Follow this story in the DITY Gallery "My Grandpa Carl's Truck and How it Became Mine" 1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)
Because GM parts wiki only has two books for GMC, 1951 and 1955-1965. When you are looking for a GMC only part you need the parts books. The 51 book shows the part (pressure relief valve) in Group 6.0180 as 2233181 The 55-65 book shows the part in Group 6.0180 and 6.2065 as 580500 Two different part numbers with no link to eachother. So you would probably look for the part using P/N 2233181. But if you had the Master Part Book 39-54 or a more current 54 book, in Group 6.0180 580500 replaces 2233181now you have the link and two numbers to search for. Then go back to the 55-65 book and in Group 6.2065, 580500 replaces 580476. Now you have three 2233181,580500 and 580476. Chevy did not use this part.
