Rubber doughnut

[speedlinerbu]

What is the black rubber doughnut for in an OMC carb kit 439071?

[garry-in-michigan]

That kit was used in dozens of OMC motors. It may be a seal in an outboard you have never seen.

• This reply was modified 5 years, 10 months ago by garry-in-michigan.

[2fast4me]

It provides a seal between the high speed jet and the main carb body. Won’t work without it.

2Fast4Me

[frankr]

2fast4me wrote:

It provides a seal between the high speed jet and the main carb body. Won’t work without it.

???Aren’t you thinking about the cork seal shown to the left of the float valve needle in the picture??

• This reply was modified 5 years, 10 months ago by frankr.

[Bob Wight]

I believe this is the high speed nozzle seal.

Bob

1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1955 Johnson QD-16
1957 Evinrude Fastwin 18
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20

“Every 20 minute job is only a broken bolt away from a 3-day project.”
"Every time you remove a broken or seized bolt an angel gets his wings."

• This reply was modified 5 years, 10 months ago by Bob Wight.
• This reply was modified 5 years, 10 months ago by Bob Wight.

[aquasonic]

I know the rubber o-ring is not used in 3 HP to 10 HP motors, so it must be used in higher horsepower models. Isn’t this kit used for up to 40 HP?

Improvise-Adapt-Overcome

[lindy46]

I’ve got dozens of those o-rings and don’t know what carbs they are used in.

[Steve D]

I only worked on a couple of these over the years so memory’s a little fuzzy, but I think there was a fat o-ring like that in the ’53 Johnson 10 horse carb. I know the kit doesn’t specify that year, but I checked my parts manual for the number (part 72 – 302832) then searched to find a picture of it, and it looks like it could be the same. Maybe someone who’s got a QD-14 could verify.

[speedlinerbu]

Grateful I am for all the input, and glad to know I wasn’t alone in my question.
Some great observations, thank you.

[Author]

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