iggy Posted May 6, 2014 Share Posted May 6, 2014 hi what size and type thread does the water pump housing have in it where the heater flow pipe attaches thanks thinking of screwing a tee piece in for my fan switch Quote Link to comment Share on other sites More sharing options...
nang Posted May 7, 2014 Share Posted May 7, 2014 Normally 3/8" NPT I think.Tony. Quote Link to comment Share on other sites More sharing options...
DJB_Harvey Posted May 7, 2014 Share Posted May 7, 2014 I think it's UNF that's why the union / blank there has a fibre washer to seal it . Quote Link to comment Share on other sites More sharing options...
piman Posted May 7, 2014 Share Posted May 7, 2014 Hello Iggy, it is a pipe thread, I don't know if NPT and BSP share common diameters and thread pitch, but as far as I can tell it matches BSP at 19 tpi and 0.650" ish diameter. It can't be UNF at that diameter and mine does not have a fibre washer, it seals purely on the taper. DJB, I think someone has been using a belts and braces approach (No washer shown in the parts book either).Alec Quote Link to comment Share on other sites More sharing options...
nang Posted May 7, 2014 Share Posted May 7, 2014 Alec,BSP and NPT are almost the same. BSP 19 tpi, NPT 18 tpi. with diameters almost the same. Tony. Quote Link to comment Share on other sites More sharing options...
iggy Posted May 7, 2014 Author Share Posted May 7, 2014 thanks for your replies every one, I was hoping it would be 3/8 bsp as that is the thread on my fan switch and I have some 3/8 bsp tees and fittings in my garage il have to unscrew the thread from the pump houseing and check it :) Quote Link to comment Share on other sites More sharing options...
piman Posted May 7, 2014 Share Posted May 7, 2014 Hello Tony,Hardly the same when you try and fit one into the port of another? I'll double check tomorrow but it certainly looked like 19 tpi.Iggy, why don't you try a BSP fitting to see if it does fit properly?Alec Quote Link to comment Share on other sites More sharing options...
DJB_Harvey Posted May 7, 2014 Share Posted May 7, 2014 It's 5/8 UNF ... Not BSP or anything else and originally it always had a fibre washer . Only PI models had this blanked off . Quote Link to comment Share on other sites More sharing options...
piman Posted May 8, 2014 Share Posted May 8, 2014 Hello DJB Harvey, 5/8" is 0.625" diameter, the one I removed yesterday is tapered and just over 0.650" at it's largest diameter? Also I used Whitworth spanners to unscrew it so typical of a pipe fitting.Alec Quote Link to comment Share on other sites More sharing options...
Richard B Posted May 8, 2014 Share Posted May 8, 2014 Do you mean this part? http://www.chriswitor.com/proddetail.php?prod=101343SS&cat=244Triumph water and fuel connectors, thats why I bought a set of Whitworth spanners. 8) Quote Link to comment Share on other sites More sharing options...
piman Posted May 8, 2014 Share Posted May 8, 2014 Hello Richard,yes that's the item I'm talking about.Alec Quote Link to comment Share on other sites More sharing options...
Richard B Posted May 8, 2014 Share Posted May 8, 2014 I think Dave was talking about the takeoff for the inlet manifold pipe, this is the one that is blanked off on PI's. (Not fitted as no need to heat the inlets, and a cold charge is always better for engines)Taper on one side and BSP on the other.I know the sump plugs are 3/8"NTP see if one of those fits. I would expect Triumph to have kept the same thread for the waterpump housing adapter. Quote Link to comment Share on other sites More sharing options...
piman Posted May 8, 2014 Share Posted May 8, 2014 Hello all, although I may have been looking at the wrong area, I can confirm that the heater pipe adapter that goes to the rear of the water pump housing is 3/8" BSP, Sorry for the confusion.Alec Quote Link to comment Share on other sites More sharing options...
iggy Posted May 8, 2014 Author Share Posted May 8, 2014 the adaptor in the picture on chris witors site is for the return pipe from the heater under the exhaust manifold, I was looking to fit the fan switch in the flow outlet from the pump housing that connects to the inlet manifold Quote Link to comment Share on other sites More sharing options...
Richard B Posted May 8, 2014 Share Posted May 8, 2014 Right. You mean this... http://www.chriswitor.com/proddetail.php?prod=138530SS&cat=244According to CW 5/8"UNF.Well 138530 is what is says in my Parts Catalogue... 8) Quote Link to comment Share on other sites More sharing options...
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