Rusty O'Toole Posted July 28, 2012 Report Share Posted July 28, 2012 When did Chrysler products first use a pressurized cooling system? I have a 49 Chrysler, 51 DeSoto and have seen an original low mile 52 Chrysler that all came with non pressure caps. At first I thought they had the wrong caps, I thought they used a 4 pound cap (which fits). Now I am not so sure, does anyone know the answer? I think they used 4 pound first, then changed to 7 pound around 1960, then a 12, a 14, and now they use a 16 since about 1990? Quote Link to comment Share on other sites More sharing options...
oldodge41 Posted July 28, 2012 Report Share Posted July 28, 2012 Found this online awhile back. Radiator Cap.pdf Quote Link to comment Share on other sites More sharing options...
Plymouthy Adams Posted July 28, 2012 Report Share Posted July 28, 2012 Rusty..not sure of the examples given but as I do own Plymouths and have the Plymouth shop manual here; it states that the pressure cooling system was intoduced in middle of 1950 for Plymouth cars. Identification of pressure system: All pressure systems then had their overflow tubes configured to the radiator fill neck. Unfortunately both the shop book and owners manual fail to mention the pressure of the cap..well, at least it seems to elude me.. Quote Link to comment Share on other sites More sharing options...
T120 Posted July 28, 2012 Report Share Posted July 28, 2012 4lb radiator cap on ebay.correct part no. kinda pricey.. http://www.ebay.com/itm/49-50-51-52-NOS-MoPar-4-Radiator-CAP-Chrysler-Plymouth-/140559400741 Quote Link to comment Share on other sites More sharing options...
48mirage Posted July 28, 2012 Report Share Posted July 28, 2012 I was looking into this the other day. I figured out the Stant # was 10208, I'm sure NAPA has an equivalent but I can't seem to find the Balkamp #. Quote Link to comment Share on other sites More sharing options...
TodFitch Posted July 28, 2012 Report Share Posted July 28, 2012 I was looking into this the other day. I figured out the Stant # was 10208, I'm sure NAPA has an equivalent but I can't seem to find the Balkamp #. This one? http://www.napaonline.com/Catalog/CatalogItemDetail.aspx?R=BK_7031412_0361173880 Quote Link to comment Share on other sites More sharing options...
52concord Posted July 28, 2012 Report Share Posted July 28, 2012 so for a 52 plymouth concord, they should be using a 4lb instead of a 7lb? Quote Link to comment Share on other sites More sharing options...
oldodge41 Posted July 28, 2012 Report Share Posted July 28, 2012 Also Allpar lists this as one of Chrysler's innovations. "Pressure vent radiator cap (1949)" Quote Link to comment Share on other sites More sharing options...
55 Fargo Posted July 29, 2012 Report Share Posted July 29, 2012 From the 1954 MoPar parts list book.1st column is Plymouth. Hi Shel, so on my 1955 Fargo, with L6 251, should I use a 4lb or 7 lb cap, I have both. They are available at NAPA for one. I bought mine locally at a local Chain, Piston Ring.... Quote Link to comment Share on other sites More sharing options...
JerseyHarold Posted July 30, 2012 Report Share Posted July 30, 2012 ......it lists both 4 and 7 pound for 1951 Plym without any notes about which model should use which. Maybe the 7 pound cap was for higher elevations to raise the boiling point of the coolant more. Quote Link to comment Share on other sites More sharing options...
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