The Ford Barn - View Single Post - 4-7 psi cap for Griffin radiator?

rotorwrench · 03-30-2021, 07:39 PM

My 1956 850 Ford has a modern radiator. They should be similar to the NAA but I'd have to check the parts book. I know my old tractor can take south Texas heat cruising all day at PTO speed even with a 4 PSI cap. I think a 7 PSI will work on it if needed.

The N series tractors like the 9N & 2N had a non-pressure system originally with the slots for the cap on the inside of the radiator bung but most have likely been replaced with the later type from late 1943 thru 8N pressure system which use replacement caps that are 4 PSI.

03-30-2021, 07:39 PM	#7
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 18,015	Re: 4-7 psi cap for Griffin radiator? My 1956 850 Ford has a modern radiator. They should be similar to the NAA but I'd have to check the parts book. I know my old tractor can take south Texas heat cruising all day at PTO speed even with a 4 PSI cap. I think a 7 PSI will work on it if needed. The N series tractors like the 9N & 2N had a non-pressure system originally with the slots for the cap on the inside of the radiator bung but most have likely been replaced with the later type from late 1943 thru 8N pressure system which use replacement caps that are 4 PSI.