Topic: Valve 3/8 16 tpi – Antique Outboard Motor Club,Inc

This topic has 9 replies, 5 voices, and was last updated 5 months, 3 weeks ago by crosbyman.

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May 30, 2024 at 12:54 pm #288042
crosbyman
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Canada Member - 2 Years
has anyone ever seen these in 3/8 16 tpi …. should be great for pressure testing GC

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May 30, 2024 at 4:52 pm #288044
wedgie
Participant
I made something like by drilling a hole in a spare gearcase plug and soldering a basketball filler needle in to it . works ok !
May 30, 2024 at 5:30 pm #288045
elgin2
Participant
US Member
Looks like a Schrader valve. I’ve seen those on expansion tanks in a water well system
May 30, 2024 at 10:09 pm #288048
crosbyman
Participant
Canada Member - 2 Years
it is a schrader valve but to fit OMC it must be 3/8 with 16tpi….if any one makes them

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May 30, 2024 at 10:37 pm #288049
labrador-guy
Participant
US Member
Yup that fitting is a schrader valve. You can buy them on ebay. I built a gear case pressure tester using one of those baby’s. I had to make a fancy fitting to screw the thing into the gear case but it works good. I use a bicycle tire pump to pressurizer the housing. I found a low pressure air gauge at tractor supply.

dale
May 31, 2024 at 7:38 am #288056
crosbyman
Participant
Canada Member - 2 Years
looking specificlly for 3/8 16tpi…. did not find any ….. will look again on ebay but if you have a link 🙂

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May 31, 2024 at 8:12 am #288057
labrador-guy
Participant
US Member
The shrader valves is 3/8″ pipe tread. I used a 3/8′ coarse tread bolt and braised it to a fitting that would screw in my “T” fitting. The tread pitch the OMC gear cases are 3/8″ coarse tread. Plumbers nightmare but it works!

dale
May 31, 2024 at 8:58 am #288060
nj-boatbuilder57
Participant
Here’s what I did: I bought a “33T” from this site: https://www.stevensinstrument.com/product-page/s-33-hose-assembly-and-parts

The male “engine side” is 3/8-16 (OMC gearcase thread), and the female side of this fitting is standard 1/4″NPT…from there you can do anything: whip hose, Tee fittings, add a schrader valve, pressure gauge, etc. ….basically anything that’s NPT. YOu can custom engineer anything you want.

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The Boat House
May 31, 2024 at 10:39 pm #288070
labrador-guy
Participant
US Member
Ya that’s nice boatbuilder! You have a good seal at the gear case too. Sometimes my gasket gets whipped out and I have to make a new one. Good to know.

dale
June 5, 2024 at 8:39 pm #288143
crosbyman
Participant
Canada Member - 2 Years
thanks for info .. I’ll see if I can find those 33t fittings locally if not available I’ll probabaly try to order if… not cost prohibitive. shipping $$$ are crazy

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Valve 3/8 16 tpi

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