Radiator Drain Tap
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It's British Standard Parallel Pipe Thread or BSPP for short.
I can't tell you what the threads per inch they are off hand.
They also have a taper _ BSPT (the "T" stands for taper).
There are adapters out there, but whether or not there's room ?
Others have also used Hylomar in the taper, and that seems to work, although I have tried it on a very small petcock to drain the heater core on my Bentley, and it still leaks.
BSP / BSPT Thread chart | British Metrics
bspp-to-npt pipe fitting adapters | McMaster-Carr
I can't tell you what the threads per inch they are off hand.
They also have a taper _ BSPT (the "T" stands for taper).
There are adapters out there, but whether or not there's room ?
Others have also used Hylomar in the taper, and that seems to work, although I have tried it on a very small petcock to drain the heater core on my Bentley, and it still leaks.
BSP / BSPT Thread chart | British Metrics
bspp-to-npt pipe fitting adapters | McMaster-Carr
Last edited by JeffR1; 09-14-2022 at 06:10 PM.
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Glyn M Ruck (09-14-2022)
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I don't remember the part well and my old radiator is stored and not accessible. However, a tap (faucet?) with a parallel thread would usually have a fibre washer. You could certainly add your favourite sealant to the washer. The softness of the washer allows a good seal and correct orientation. Taps and even end caps are sometimes supplied with a suitable washer. Don't over tighten and destroy the washer - we've all done it and some professionals seem to do it a lot!
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Glyn M Ruck (09-15-2022)
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If the Yamabond fails which I doubt you can also try some thread tape and as Peter says there should be a fibre washer..
Yamabond available at your Yamaha dealer. Made for precision gasketless casing joints where some movement is possible. Like duct tape every racing team including F1 carries it. Just peels off afterwards. So no scraping required
Yamabond available at your Yamaha dealer. Made for precision gasketless casing joints where some movement is possible. Like duct tape every racing team including F1 carries it. Just peels off afterwards. So no scraping required
Last edited by Glyn M Ruck; 09-15-2022 at 08:47 AM.
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The taper in the NPT does enable it to seal with the wrong thread size.
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Jeff, it threaded without any force and it never leaked again like the original faucet did, I would have preferred to keep the original remote controlled faucet but I could not get it to stop the drop by drop leak, the brass ball and cavity are worn.
Curiously, the engine block has an identical faucet in the exhaust side that does not leak. but made of a different silvery material, I am thinking of removing it and using it for the radiator if it threads, on the other hand I am also thinking of replacing the radiator so for now the whole thing is on standby.
Curiously, the engine block has an identical faucet in the exhaust side that does not leak. but made of a different silvery material, I am thinking of removing it and using it for the radiator if it threads, on the other hand I am also thinking of replacing the radiator so for now the whole thing is on standby.
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Thorsen (09-16-2022)
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Jeff, it threaded without any force and it never leaked again like the original faucet did, I would have preferred to keep the original remote controlled faucet but I could not get it to stop the drop by drop leak, the brass ball and cavity are worn.
Curiously, the engine block has an identical faucet in the exhaust side that does not leak. but made of a different silvery material, I am thinking of removing it and using it for the radiator if it threads, on the other hand I am also thinking of replacing the radiator so for now the whole thing is on standby.
Curiously, the engine block has an identical faucet in the exhaust side that does not leak. but made of a different silvery material, I am thinking of removing it and using it for the radiator if it threads, on the other hand I am also thinking of replacing the radiator so for now the whole thing is on standby.
It's brass on brass, you won't notice any resistance.
The original petcocks can be very frustrating.
I'm dealing with one now.
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