Yanmar with aftermarket tach and temp guage - Page 2 - SailNet Community
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post #11 of 13 Old 08-07-2007 Thread Starter
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Tim - good advice - hadn't thought of the lack of water flow.

Another problem with the tee connector, or even finding a spare plug in the coolant system - From what I read from the Teleflex instrument website - Yanmar used a PT 3/" 19 (thread) ffitting for their sensors, and the common auto shop tee connectors, and water temp sensors ate NPT 3/8" 18 (thread). Talked to a couple of plumbing shops, who had never heard of the 19 thread. Does anyone have any info on this? Is it possible to get fittings and sensors that are 3/8" 19 ??? Or was a Yanmar specific thing?

Teleflex says you can re-tap to 3/8 18, but would that be worth the risk. What type of metal or cast iron, is the thermostat housing made of (ie how soft is it) and would it be fairly easy, or hard to re-tap?
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post #12 of 13 Old 08-07-2007
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Re-tapping the pipe thread is easy. Pipe threads are tapered, so the tap itself will pull itself in and cut new metal. Cooling systems don't operate under much pressure, so you don't need huge thread strength. Make sure to use either teflon tape or a pipe thread sealant compound.

Hopefully the hole is in the thermostat housing so you can take if off, tap it and clean any cuttings out before you put it back on. If not, a trick is to pack the tap with grease, cut some thread then wipe the grease/cuttings off the tap and keep repeating until the thread is cut deep enough. The grease will catch the cuttings and keep them out of the block. (It might be worthwhile to change the coolant after you're done in any event.)

If the end of the tap hits something before the threads are cut, grind the end off the tap.

Good luck,

Tim
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post #13 of 13 Old 08-07-2007 Thread Starter
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The sensor does go in the thermostat housing, so I can take it off to tap it.
Thanks for the input!
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