A standard O-ring will work but the quad rings will seal better. Here’s a link to quad rings at McMaster Carr
https://www.mcmaster.com/90025K347/
On your picture from Marine Engine, what looks like a rubber lip on the carbon seal is actually the raised lip I was talking about – it’s an integral part of the carbon seal itself. That lip should face the crankcase.
There is only 1 O-ring inside the carbon seal. There is a larger O-ring that goes around the lower crank bearing – you will have to split the case to replace that one.
Bob
1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1955 Johnson QD-16
1957 Evinrude Fastwin 18
1957 Evinrude 3022
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20
1982 Evinrude 25hp
“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."
