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Thread: Coolant tap on TR3 block

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    Coolant tap on TR3 block

    I have now purchased two block taps from Moss Motors, and one from Victoria British and they either don't fit or they leak.

    Does anyone know exactly what thread size is needed, as I'm just going to put a blank in the block.

    Thanks in advance for help!

    dave

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    Re: Coolant tap on TR3 block

    If you are into originality, take some black silicone or whatever and plug the hole on the original tape from the back and then if you want to drain the block remove the whole tape.

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    Re: Coolant tap on TR3 block

    Thanks - i think that's what I'll do.

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    Re: Coolant tap on TR3 block

    I have had more leakage problems with those @%!# valves than with anything else. I gave up, long ago, and just use a plug.

    Here's what I did on the TR engine. The washer is soft-soldered to the bolt, so it won't leak, and the black thing is a washer I made out of delrin. You could use any solf material for the washer, probably even unhardened aluminum or a copper washer. The bolt is 1/2 fine threaded; it appears that the thread is not a pipe thread, which I would have expected.
    Steve Maas
    1966 Triumph TR4A, undergoing restoration: http://www.nonlintec.com/tr4a
    1952 MG TD, restoration completed 2014, sold 2016: http://www.nonlintec.com/mgtd
    1960 Austin-Healey "Bugeye" Sprite, sold 2010: http://www.nonlintec.com/sprite
    1967 Porsche 912: http://www.nonlintec.com/porsche

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    Andrew Mace  (02-09-2019)

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