TO-30 temperature probe gasket

W7BCW · Jun 10, 2014

I have replaced the temperature gauge/probe assembly twice now
and the new assemblies I bought from YT. In both purchases they never send a new gasket that is used to seal the probe in the casting where it is mounted. Does anyone have any idea where I can get a new gasket or perhaps what size it should be? The probe itself is 3/8" in diameter so the seal ID should be 3/8" so would a standard O-ring work?
Thanks,
Bruce

1948jr · Jun 10, 2014

it should seal itself no gasket needed. maybe cross threaded or just not tight enough

miner09 · Jun 10, 2014

You can use thread tape or pipe dope on threads. It should seal without this if it is correct size and is tight.

W7BCW · Jun 10, 2014

No leaks but this seal was here with the original temp. probe. I replaced it the first time because the capillary tube was broken and then a second time because I wasn't getting a good reading that I thought it should, stayed near bottom of scale and didn't rise up to a working level. Second meter is doing same so my thinking is the probe end is touching the other side of the casting creating a heatsink effect on the probe. The gasket may prevent the probe end from touching the casting side. However I have found if there is no water around that probe you won't get a good water temp reading either. Wrapping the probe flange with Teflon tape might work for keeping the leaks away.

Ark68SS · Jun 10, 2014

(quoted from post at 15:45:11 06/10/14) so would a standard O-ring work?
Thanks,
Bruce

I'd find a copper or aluminum washer for a spacer/seal. The sender/nut assembly is kinda like a compression fitting and you'll need to get the nut tight enough to squash a rubber O-ring.
BillL

Jason S. · Jun 11, 2014

(quoted from post at 23:45:11 06/10/14) I have replaced the temperature gauge/probe assembly twice now
and the new assemblies I bought from YT. In both purchases they never send a new gasket that is used to seal the probe in the casting where it is mounted. Does anyone have any idea where I can get a new gasket or perhaps what size it should be? The probe itself is 3/8" in diameter so the seal ID should be 3/8" so would a standard O-ring work?
Thanks,
Bruce

When I installed mine I opened the hole up with a drill for the probe to stick thru and then I sealed mine with a standard oring. Hasn't leaked in 3 years.

TO-30 temperature probe gasket

W7BCW

New User

1948jr

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miner09

Well-known Member

W7BCW

New User

Ark68SS

Member

Jason S.

Well-known Member

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