Temperature sender crush washer?

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I recently replaced the temperature gauge in my boat with a Vetus unit (Vetus is readily available here in South Africa, reasonably priced, and looks to be decent quality). After some testing, I concluded that the original temperature sender and the Vetus gauge are mismatched in terms of resistance range, so I'm replacing the sender with a matching Vetus one.
The Vetus sender has an interesting design, with a pronounced beveled shoulder between the threaded section of the sender and the hex section above the threads.

Vetus temperature sender

The threads are M14 x1.5 (i.e. parallel), which will typically require a crush washer to seal properly (and an adapter to fit into NPT female threads in the coolant passages). However, the sender did not ship with a crush washer, and I haven't seen a crush washer mentioned or shown in any catalogue or installation instructions. This makes me think that the bevel is designed so as to seal against the mounting surface without the use of a crush washer. Vetus customer care hasn't been helpful so far. Any thoughts as to whether I can get away without a crush washer? Probably no harm in using one, but it will feel like I'm doing the Vetus engineers an injustice if I use a crush washer for a part that doesn't need it!

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Wilhelm Hertzog Members Profile Send Private Message Find Members Posts Visit Members Homepage Add to Buddy List Senior Member Joined: June-14-2014 Location: Cape Town Status: Offline Points: 334	Post Options Post Reply Quote Wilhelm Hertzog Report Post Thanks(0) Quote Reply Topic: Temperature sender crush washer? Posted: February-10-2024 at 3:32pm
	I recently replaced the temperature gauge in my boat with a Vetus unit (Vetus is readily available here in South Africa, reasonably priced, and looks to be decent quality). After some testing, I concluded that the original temperature sender and the Vetus gauge are mismatched in terms of resistance range, so I'm replacing the sender with a matching Vetus one. The Vetus sender has an interesting design, with a pronounced beveled shoulder between the threaded section of the sender and the hex section above the threads. Vetus temperature sender The threads are M14 x1.5 (i.e. parallel), which will typically require a crush washer to seal properly (and an adapter to fit into NPT female threads in the coolant passages). However, the sender did not ship with a crush washer, and I haven't seen a crush washer mentioned or shown in any catalogue or installation instructions. This makes me think that the bevel is designed so as to seal against the mounting surface without the use of a crush washer. Vetus customer care hasn't been helpful so far. Any thoughts as to whether I can get away without a crush washer? Probably no harm in using one, but it will feel like I'm doing the Vetus engineers an injustice if I use a crush washer for a part that doesn't need it!
	1982 Ski Nautique PCM351W RR II Velvet Drive 10-17-003 1:1 II PerfectPass Stargazer Do not go gentle into that good night. Rage, rage against the dying of the light.

KENO Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 11112	Post Options Post Reply Quote KENO Report Post Thanks(0) Quote Reply Posted: February-10-2024 at 5:59pm
	Here's a link to a VDO temperature sensor with the same threads and the same or similar taper and it uses a washer The link is just to show a couple pictures of the washer and sensor. link I suppose that when you screw the sending unit into the adapter you'll be able to see if it needs a washer, but assuming that you do, it should be relatively easy to find a washer. Quite a few oil drain plugs are 14 mm and one of those washers would work. Probably easily available locally for you. It could be metal or fiber/plastic No injustice involved

63 Skier Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: October-06-2006 Location: Concord, NH Status: Offline Points: 4269	Post Options Post Reply Quote 63 Skier Report Post Thanks(0) Quote Reply Posted: February-11-2024 at 11:17am
	I agree with using a washer. If when you screw in the sender with washer and it gets snug and the washer still isn't pinched you'll know the taper is supposed to be the seal, but my guess is you'll snug up against the washer for your seal.
	'63 American Skier - '98 Sport Nautique

Wilhelm Hertzog Members Profile Send Private Message Find Members Posts Visit Members Homepage Add to Buddy List Senior Member Joined: June-14-2014 Location: Cape Town Status: Offline Points: 334	Post Options Post Reply Quote Wilhelm Hertzog Report Post Thanks(0) Quote Reply Posted: February-11-2024 at 3:12pm
	Thanks gents. A washer it will be then.
	1982 Ski Nautique PCM351W RR II Velvet Drive 10-17-003 1:1 II PerfectPass Stargazer Do not go gentle into that good night. Rage, rage against the dying of the light.

Temperature sender crush washer?

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