Roger K Posted December 31, 2020 Report Share Posted December 31, 2020 Is anyone able to tell me the tapping thread size for the heater valve for a GT6 MkIII, where it threads into the 3-way banjo fitting on the intake manifold? I'm guessing BSP of some size... Thanks Roger Link to comment Share on other sites More sharing options...
dougbgt6 Posted December 31, 2020 Report Share Posted December 31, 2020 Quite a few threads on here about the banjo bolt Inlet manifold banjo thread - Engine - The Triumph Sports Six Club Forum (tssc.org.uk) Doug Link to comment Share on other sites More sharing options...
Roger K Posted December 31, 2020 Author Report Share Posted December 31, 2020 There are, but I haven't been able to find one that gives the thread size for the heater valve... Link to comment Share on other sites More sharing options...
Clive Posted December 31, 2020 Report Share Posted December 31, 2020 Pretty sure it is 1/2" BSP. Certain about the BSP part, seen MI pipe fittings used to make connectors. Link to comment Share on other sites More sharing options...
Pete Lewis Posted December 31, 2020 Report Share Posted December 31, 2020 it seems its 3/8"British Standard Pipe Parallel (BSPP) according tp some suppliers Pete Link to comment Share on other sites More sharing options...
Clive Posted December 31, 2020 Report Share Posted December 31, 2020 Just now, Pete Lewis said: it seems its 3/8"British Standard Pipe Parallel (BSPP) Pete Hmm, that could be right, though I am sure the valve has a tapered thread? Or maybe my memory is playing more tricks. I can't remember how BSP thread sizes are measured. So the 3/8 is entirelyrley likely https://www.v-flowsolutions.co.uk/british-pipe-threads/ Link to comment Share on other sites More sharing options...
dougbgt6 Posted December 31, 2020 Report Share Posted December 31, 2020 31 minutes ago, Roger K said: There are, but I haven't been able to find one that gives the thread size for the heater valve... Maybe I'm misunderstanding, but the thread I've highlighted says 1/2" BSP and 1/2" BSPT {tapered) Nobody listens to me Doug Link to comment Share on other sites More sharing options...
Pete Lewis Posted December 31, 2020 Report Share Posted December 31, 2020 https://www.ebay.co.uk/itm/Triumph-GT6-Mk2-GT6-Mk3-Heater-Valve-NEW-IMPROVED-/200313735738 this seller says ( quite adamantly ) the screw in heater valve is 3/8bspp being different diameter to the banjo bolt which is 1/2" bspp so now theres contest to find out whats your size ??? Pete Link to comment Share on other sites More sharing options...
Colin Lindsay Posted December 31, 2020 Report Share Posted December 31, 2020 Landrover forum says the Smiths valve thread is 1/2 BSP, and I think they use the same one as our cars. Link to comment Share on other sites More sharing options...
Roger K Posted January 1, 2021 Author Report Share Posted January 1, 2021 On 31/12/2020 at 14:24, dougbgt6 said: Maybe I'm misunderstanding, but the thread I've highlighted says 1/2" BSP and 1/2" BSPT {tapered) Nobody listens to me Doug Doug, the heater valve on the MkIII threads into the union shown in the diagram as part 6. That union has one hose fitting cut off (in effect) and the mini-type heater valve threaded directly into it in its place. That's the thread I was asking about, not the thread for the actual banjo fitting. It's not shown in that diagram. Sorry for the confusion! Roger Link to comment Share on other sites More sharing options...
PeteH Posted January 2, 2021 Report Share Posted January 2, 2021 Hi Useful calc;/check tool?:- https://www.rowse.co.uk/blog/post/how-to-measure-bsp-fittings The ref; point is to Airline fittings, but still a good guide. Rule of thumb used to be inside dia of the pipe being used. Say 1/4 id = 1/4 BSP. Not an exact science but gives a start point. And little use with hose!. Pete Link to comment Share on other sites More sharing options...
Colin Lindsay Posted January 2, 2021 Report Share Posted January 2, 2021 So if I'm right it's one of these: Which is just 1/2 inch BSP; the Smiths valve itself is tapered, not the fitting: Link to comment Share on other sites More sharing options...
Roger K Posted January 2, 2021 Author Report Share Posted January 2, 2021 That's the chap. So the hole needs to be 1/2 BSPP - parallel hole to take a tapered male thread. Thanks, should be all set now. Roger Link to comment Share on other sites More sharing options...
SpitFire6 Posted January 3, 2021 Report Share Posted January 3, 2021 On 02/01/2021 at 10:31, Roger K said: That's the chap. So the hole needs to be 1/2 BSPP - parallel hole to take a tapered male thread. Thanks, should be all set now. Roger BSPP female for a BSPT thread? That does not sound right. Link to comment Share on other sites More sharing options...
rlubikey Posted January 5, 2021 Report Share Posted January 5, 2021 On 03/01/2021 at 11:45, SpitFire6 said: BSPP female for a BSPT thread? That does not sound right. Doesn't sound like it's as designed, but from my experience in fluid systems, it does work. I would suggest using PTFE thread tape which will help it seal, lower friction as your thread it in place, and enable you to remove the valve when it fails (if its a new one) and fit the 4-Seasons jobbie. Without thread tape or something similar it will seize given time. A posteriori - which is something similar to what I shouted when it happened to me! Cheers, Richard Link to comment Share on other sites More sharing options...
Pete Lewis Posted January 6, 2021 Report Share Posted January 6, 2021 as a production process the hole would be a straight tapping the fitting a taper pete Link to comment Share on other sites More sharing options...
Roger K Posted January 6, 2021 Author Report Share Posted January 6, 2021 15 minutes ago, Pete Lewis said: as a production process the hole would be a straight tapping the fitting a taper pete That sounds right to me - on other cars I have often found a parallel hole, with a taper thread on the component fitted to it. Link to comment Share on other sites More sharing options...
Pete Lewis Posted January 6, 2021 Report Share Posted January 6, 2021 Yes its a lot easier to tap a straight hole and die /chaser box a male taper thread to a size when it comes to mass prodn holes Pete Link to comment Share on other sites More sharing options...
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