“O” ring sub number

[drifter]

Is there a common “O” ring number for the upper drive shaft “O” ring used on many of the 50’s OMC outboards. P/N 0303347 prices seem ridiculous.

[olcah]

https://aomci.org/forums/topic/o-ring-size/

This might help.

[crosbyman]

oring chart

Joining AOMCI has priviledges 🙂

• This reply was modified 4 years, 11 months ago by Mumbles.

[lindy46]

I bought an o-ring assortment from Harbor Freight and can usually find one that fits.

[crosbyman]

GLM 81110 matches the size maybe a local seal/bearing shop can order it …. might be cheaper

Joining AOMCI has priviledges 🙂

[outbdnut2]

I also find these in my Harbor Freight assortment.

https://www.harborfreight.com/382-piece-o-ring-assortment-67554.html

Dave

[garry-in-michigan]

This is what Sierra Marine has . . .

[bobw]

I’ve used these size charts by finding the appropriate OEM number, verifying the correct dimensions as shown in the chart, then finding the matching size at my local Ace Hardware store where they have drawers full of O-rings.

Bob

1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
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."

[outboardnut]

But don’t we have to careful in regards to what kind of materiel the O ring is made of?
Aren’t some O-rings made for water and others are for oil?

[Author]

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