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08-18-2017, 05:47 PM | #1 |
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Join Date: Mar 2015
Location: Acworth GA
Posts: 534
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Need a new radiator cap
I need a sealing cap for my radiator, which is a stock configuration 1936. I am running the 3 psi pressure valve on the overflow and the existing cap isn't sealing well. There some dribbles around the cap after any run at street/highway speeds over about 40 mph.
I have one of the high-buck caps with the bail on it, but it fits much worse than the old (brand unknown) cap I have. The old one also leaks a little. Does anyone have a recommendation? Thanks, John
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08-18-2017, 05:49 PM | #2 |
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Join Date: May 2010
Location: new britain,ct 06052
Posts: 9,393
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Re: Need a new radiator cap
New gasket........................
Paul in CT |
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08-18-2017, 06:11 PM | #3 |
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Join Date: May 2015
Posts: 8,435
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Re: Need a new radiator cap
I went to ACE Hardware and purchased some rubber gasket material they sell in their plumbing section and made a new gasket to used on the cap for my '34. Worked like a champ. The material is available in various thickness. > http://www.acehardware.com/product/i...ductId=1272624
or > http://www.acehardware.com/product/i...uctId=22767006
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08-18-2017, 06:22 PM | #4 |
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Join Date: Oct 2012
Location: San Francisco Bay Area
Posts: 428
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Re: Need a new radiator cap
I had the same problem with my 1936 Bail style cap and did the same as petehoovie, but I just used a piece of old inner tube left over from replacing all my tires and tubes a few years ago.
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08-19-2017, 09:26 AM | #5 | |
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Join Date: May 2010
Location: Florida and Penna.
Posts: 4,471
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Re: Need a new radiator cap
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Quote:
valve it says the stock caps don't seal tight enough to hold a few pounds of pressure. You need to drill the rivet out of the cap and make a round washer like seal from the 1/8th inch red rubber gasket material found in hardware stores. Replace the rivet with a slotted SS 1/4-20 screw 3/4" long with a lock washer and 2 nuts so it don't come loose. Make sure you remove and flush the new valve twice a year. G.M.
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