Guest rbjt Posted June 9, 2012 Share Posted June 9, 2012 Hello,Work on my Austalian 1927 Tourer is progressing. I have a question about the original radiator cap thread size. I have come across two radiators that seem to be originals however their cap thread diameters are about 43mm (1.70 inches). The problem is the radiator caps I have seen have thread diameters of about 55mm (2.17 inches). I don't have the originals of either from my car so am not sure which is correct? I'm hoping someone will be able to confirm. Thank you,Ryan Link to comment Share on other sites More sharing options...
Guest rbjt Posted June 12, 2012 Share Posted June 12, 2012 Does anyone own one of the first model Pontiacs with original radiator specs and is able to meaure the size of the cap thread? Look forward to hearing from you. Cheers, Ryan Link to comment Share on other sites More sharing options...
nzcarnerd Posted June 12, 2012 Share Posted June 12, 2012 I have one. I will check later today and get back with the dimensions. Link to comment Share on other sites More sharing options...
Guest rbjt Posted June 13, 2012 Share Posted June 13, 2012 Great, thanks! I look forward to seeing what you find Link to comment Share on other sites More sharing options...
nzcarnerd Posted June 13, 2012 Share Posted June 13, 2012 Whoops, 10pm and another day gone by and forgot to do it. Will check in the morning. Link to comment Share on other sites More sharing options...
Guest rbjt Posted June 13, 2012 Share Posted June 13, 2012 No worries, I'll keep an eye out for your reply Link to comment Share on other sites More sharing options...
nzcarnerd Posted June 14, 2012 Share Posted June 14, 2012 That figure of 2.17" you quoted for the outside diameter of the thread is correct. I measured one of mine today - the top tank is dated June 1926. I don't have a radiator cap for mine and as you will see from these pics - What is it? Car Quiz #316 - PreWarCar - I don't have a lot of other parts for it either, but it does run. Link to comment Share on other sites More sharing options...
Guest rbjt Posted June 14, 2012 Share Posted June 14, 2012 Thanks very much for that! Cheers, Ryan Link to comment Share on other sites More sharing options...
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