Hamish Posted May 2, 2021 Report Share Posted May 2, 2021 (edited) I have an idea brewing about a water / oil cooler heat exchanger. has anyone tapped these orifices if so what size ? to fit this barbed type fitting ? H Peter, did I read somewhere that you and your brother had threaded these in years gone by ? Edited May 2, 2021 by Hamish Quote Link to post Share on other sites
Ralph Whitaker Posted May 2, 2021 Report Share Posted May 2, 2021 Good to see that there is someone else who has not gone away for the weekend. It has been very quiet on here lately. Can you utilise the already tapped fitting for the heater circuit ?, although I am not sure of the direction of water circulation there. I have been outside with the TR on the 2 post lift changing the exhaust downpipe gasket that was blowing, and re-sealing the exhaust joints. Dodging rain showers. Ralph Quote Link to post Share on other sites
BlueTR3A-5EKT Posted May 2, 2021 Report Share Posted May 2, 2021 (edited) 3 hours ago, Hamish said: I have an idea brewing about a water / oil cooler heat exchanger. has anyone tapped these orifices if so what size ? to fit this barbed type fitting ? H Peter, did I read somewhere that you and your brother had threaded these in years gone by ? No never done that. Someone told me the hole accepted a 1/4 BSP thread, the tapping hole for which is 11.8mm. You’d have to measure. I would expect the heater return pipe would provide easy water flow and return for a Modine oil cooler setup. Peter W Edited May 2, 2021 by BlueTR3A-5EKT Quote Link to post Share on other sites
BlueTR3A-5EKT Posted May 2, 2021 Report Share Posted May 2, 2021 2 minutes ago, BlueTR3A-5EKT said: No never done that. Someone told me the hole accepted a 1/4 BSP thread, the tapping hole for which is 11.8mm. You’d have to measure. I would expect the heater return pipe would provide easy water flow and return for a Modine oil cooler setup. Peter W Quote Link to post Share on other sites
Hamish Posted May 6, 2021 Author Report Share Posted May 6, 2021 Hi me again please can someone tell me the thread sizes arrowed on the pic of the heater return. i want to buy screw in barbed hose fittings Like above for it my heat exchanger idea has taken a step forward as it has arrived are they 3/8bsp ? Quote Link to post Share on other sites
NCS_TR3A Posted May 6, 2021 Report Share Posted May 6, 2021 Hi Hamish, On mine, TR3A the thread on the arrow furthest right is 3/4" 16 tpi. Not sure on the other, possibly the same but never had it out. Neil Quote Link to post Share on other sites
Z320 Posted May 6, 2021 Report Share Posted May 6, 2021 (edited) The threads in the pump housing and in the fitting have different diameter and tpi - in the housing tapered 18 tpi, perhaps 3/8-18 NPT, no fit with 3/8-19 BSP - in the fitting 16 tpi x di = about 17.1 mm, perhaps 3/4"-16 UNF, as Niel points out, but this is di = 17.5 mm Dimensions picked up on 2 housings with wide bypass (TR3-4), on 2 fittings but without any nut for the fittings, sadly I have no bolt 3/4-16 UNF to test for you Edited May 6, 2021 by Z320 Quote Link to post Share on other sites
Hamish Posted May 7, 2021 Author Report Share Posted May 7, 2021 Thanks for your help. I have ordered a selection of fittings to experiment with. Quote Link to post Share on other sites
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