BobT-47P15 Posted September 4, 2015 Report Share Posted September 4, 2015 The old Mopars originally had no pressure radiator systems. Sometimes it's hard to find a correct radiator cap. Sometime back, I found one available at NAPA stores..............they may have to order it in from the warehouse........but last I knew they had them. Cost was only 3 or 4 dollars. It was a Balkamp brand. Here is a picture of the box with part number.............. Just thought this information might be helpful to someone. Quote Link to comment Share on other sites More sharing options...
mopar_earl Posted September 4, 2015 Report Share Posted September 4, 2015 Depending on the year some do use pressure caps. My 52 came factory equipped with a 4 psi cap, which I replaced with a new Napa 4 psi cap. Earl Quote Link to comment Share on other sites More sharing options...
mopardude Posted September 4, 2015 Report Share Posted September 4, 2015 I think that pre 1949 were all non-pressurized caps, though. '49 and up were pressurized I do believe. Quote Link to comment Share on other sites More sharing options...
Plymouthy Adams Posted September 4, 2015 Report Share Posted September 4, 2015 this is the P15/D24 website...often the main membership still refers to these cars in their posting.. Quote Link to comment Share on other sites More sharing options...
greg g Posted September 4, 2015 Report Share Posted September 4, 2015 In the systems in the 46 through early 49 years the cap is of no significance, since the overflow dome is above the cap and vents directly to the atmosphere. So even if you put a 20 lb cap on the system will still not pressurize. Later models may have the vent hose on the filler but it that hose is below where the gasket of the cap seals the cap again does nothing to allow pressure to build, Quote Link to comment Share on other sites More sharing options...
BobT-47P15 Posted September 4, 2015 Author Report Share Posted September 4, 2015 Yes........I was only speaking of the P15 actually since I have a 47. Have not owned (for any length of time) as later 1950s model. So, there is a little difference in various models. Quote Link to comment Share on other sites More sharing options...
mopar_earl Posted September 4, 2015 Report Share Posted September 4, 2015 this is the P15/D24 website...often the main membership still refers to these cars in their posting.. I see all years on here. Was only being helpful. Just wanted to make sure ppl know some cars do have pressure caps. You want pressure caps if the car ia suppose to have one. Sorry if I offended anyone by trying to be helpful. I will never get my in the click badge at the rate I'm going lol Earl 3 Quote Link to comment Share on other sites More sharing options...
Plymouthy Adams Posted September 4, 2015 Report Share Posted September 4, 2015 was not slamming you on the post inasmuch as I was just making it known lot of members still post info based solely on P15-D24 with no allowances for other models is all..many answers here are given to questions asked when a person makes a general inquiry with no facts known of year and model..95% of the time the first answer will be based on the P15/D24 models Quote Link to comment Share on other sites More sharing options...
DonaldSmith Posted September 4, 2015 Report Share Posted September 4, 2015 (edited) Does my '47 radiator care if there is a pressure cap? Isn't there an overflow that is open to the atmosphere? Edited September 4, 2015 by DonaldSmith Quote Link to comment Share on other sites More sharing options...
Plymouthy Adams Posted September 4, 2015 Report Share Posted September 4, 2015 Donald...look at your very own posted pictures...that alone will explain things better than the so called 1000 words... Quote Link to comment Share on other sites More sharing options...
Don Coatney Posted September 4, 2015 Report Share Posted September 4, 2015 Does my '47 radiator care if there is a pressure cap? Isn't there an overflow that is open to the atmosphere? hose, upper.jpg I cannot open your photo for some unknown reason. But if your radiator has this button at the top of the upper tank this is the vent to the atmosphere. 1 Quote Link to comment Share on other sites More sharing options...
mopar_earl Posted September 4, 2015 Report Share Posted September 4, 2015 Does my '47 radiator care if there is a pressure cap? Isn't there an overflow that is open to the atmosphere? hose, upper.jpg Nope, that's why it didn't come from the line with one on it. Lol you could probably convert it to a pressure system but I don't know if all the components would handle pressure. I wouldn't risk it myself. Earl Quote Link to comment Share on other sites More sharing options...
Plymouthy Adams Posted September 4, 2015 Report Share Posted September 4, 2015 (edited) if in reading the manual there is no specification on the radiator cap. (for the year Don is inquiring) There is never a mentioning to its service in any regard...therefore it has no effect on the cooling system except to keep slosh over in check to some degree and other foreign matter out of the system..and in case of boil over..direct the pressure and fluid loss through the vent cap and attached metal tube to a safe point below the car... Edited September 4, 2015 by Plymouthy Adams Quote Link to comment Share on other sites More sharing options...
mopar_earl Posted September 4, 2015 Report Share Posted September 4, 2015 was not slamming you on the post inasmuch as I was just making it known lot of members still post info based solely on P15-D24 with no allowances for other models is all..many answers here are given to questions asked when a person makes a general inquiry with no facts known of year and model..95% of the time the first answer will be based on the P15/D24 models Ok good enough man. But not all of us see it as a certain year forum. I myself consider it a pre 1960 forum though I believe I've seen newer years than that posted. If I recall I believe this was the only forum I could find to cover my 52. The AACA forums for mopars didn't blow my hair back. So I came here. For the most part I enjoy it. There are one or two ppl that are a bit hard core but you will have that anywhere. Earl Quote Link to comment Share on other sites More sharing options...
DonaldSmith Posted September 4, 2015 Report Share Posted September 4, 2015 The photo makes the point of my rhetorical questions. There may be a physical difference between a non-pressurized cap and the pressurized ones, a difference that would keep them from fitting my car; otherwise my car doesn't care Quote Link to comment Share on other sites More sharing options...
BobT-47P15 Posted September 4, 2015 Author Report Share Posted September 4, 2015 Well..........the name of the forum is the P15-D24 forum.................with the P15 identifying Plymouths from 1946 to the "early 1949" models. And the D24 indicating Dodges of the same years. However, I think some place in the moderator's description, it mentions other older Mopars as being included. Which is great, as I think they are much the same animal in their overall makeup. And certain parts will interchange in those models. So..........don't anybody go away............. Stick around and have fun. Sometimes some of us may sound grouchy.........but we are really not. (Our wives may give a different opinion........lol) 1 Quote Link to comment Share on other sites More sharing options...
DonaldSmith Posted September 4, 2015 Report Share Posted September 4, 2015 Sometimes the written word can be misconscrewed. 1 Quote Link to comment Share on other sites More sharing options...
Merle Coggins Posted September 4, 2015 Report Share Posted September 4, 2015 (edited) ... misconscrewed. What an awesome word. It would seem that if someone got misconscrewed (I think you meant misconstrued) than they would also become discombobulated fairly easily too. Edited September 4, 2015 by Merle Coggins Quote Link to comment Share on other sites More sharing options...
wdoland Posted September 4, 2015 Report Share Posted September 4, 2015 I have a Chrysler. Does this mean I'm miscon"screwed"? Quote Link to comment Share on other sites More sharing options...
Don Coatney Posted September 4, 2015 Report Share Posted September 4, 2015 I have a Chrysler. Does this mean I'm miscon"screwed"? No, just means you have a Crashler. Quote Link to comment Share on other sites More sharing options...
RobertKB Posted September 4, 2015 Report Share Posted September 4, 2015 Misconscrewed. I love it! A new word has been coined. Quote Link to comment Share on other sites More sharing options...
Plymouthy Adams Posted September 4, 2015 Report Share Posted September 4, 2015 for the word to have just been coined, the internet is very full of the slang applications of the word....as the old saying goes, kicked the slats out of my cradle when I first heard this one... Quote Link to comment Share on other sites More sharing options...
DonaldSmith Posted September 4, 2015 Report Share Posted September 4, 2015 I resemble that remark! Misconscrewed is my attempt at humor. Humor is not always sensed in the written word. Then again, sometimes my humor takes some getting used to. So, if you feel putdown or insulted by something someone posted, maybe the guy is just kidding. 1 Quote Link to comment Share on other sites More sharing options...
RobertKB Posted September 4, 2015 Report Share Posted September 4, 2015 (edited) Anyway, new to me. It will quickly become part of my entrenched vocabulary. Sorry to have misconscrewed the coining of the word. Edited September 4, 2015 by RobertKB Quote Link to comment Share on other sites More sharing options...
DonaldSmith Posted September 4, 2015 Report Share Posted September 4, 2015 My sediments exactly. Quote Link to comment Share on other sites More sharing options...
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