Andy Moltu Posted September 8, 2021 Report Share Posted September 8, 2021 Is the alloy plug in the cylinder head threaded or a core plug. A friends is leaking and neither of us has replaced one. Quote Link to post Share on other sites
BlueTR3A-5EKT Posted September 8, 2021 Report Share Posted September 8, 2021 Aluminium one in the Top of head is threaded. One in rear face is a steel core plug either cup or dish type. Quote Link to post Share on other sites
Andy Moltu Posted September 8, 2021 Author Report Share Posted September 8, 2021 Thanks, it’s the one on top. Quote Link to post Share on other sites
james christie Posted September 8, 2021 Report Share Posted September 8, 2021 It can be a s*d to get out. The threads in the head will need cleaning out. The new one can be glued in with a modern form of Araldite placed on the threads. There was a thread on this a year or so ago. Goodluck! james Quote Link to post Share on other sites
Andy Moltu Posted September 14, 2021 Author Report Share Posted September 14, 2021 Any idea of what the thread size is? Quote Link to post Share on other sites
BlueTR3A-5EKT Posted September 14, 2021 Report Share Posted September 14, 2021 17 minutes ago, Andy Moltu said: Any idea of what the thread size is? Yes, the plug which is Triumph part number PS1603 is 1" NF thread Just look in the Standard Triumph hardware catalogue.... https://www.canleyclassics.com/standard-triumph-hardware-catalogue-plug-core-screwed Peter W Quote Link to post Share on other sites
iain Posted September 14, 2021 Report Share Posted September 14, 2021 Usually so rotten that when you start to pick at the centre they just crumble :-) As Peter says 1” NF. Iain Quote Link to post Share on other sites
Andy Moltu Posted September 14, 2021 Author Report Share Posted September 14, 2021 Thanks. Quote Link to post Share on other sites
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