first64riv Posted February 15, 2017 Share Posted February 15, 2017 In my ongoing TH400 leak saga, I am at the home stretch. I find a leak at the fitting so now I need to replace it. I've had it off once but never bothered to measure it. I need to know what the 1964 TH400 casing was tapped with for the cooling lines. I think it's 1/4 NPT into the case and i know it' a 5/8 flare fitting on the line side. Is my 1/4" assumption correct? Chris Link to comment Share on other sites More sharing options...
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