1984 Evinrude 15hp mystery rubber part

seakas

Cadet
Joined
Jan 16, 2013
Messages
19
Hi folks,

I had to replace the upper thrust mounts on my 15 hp evinrude. As I am putting it all back together, I notice a rubber O-ring or washer (what was left of it) down in the hole in the exhaust housing where the crank case seal is inserted. Problem is I can't find any reference to it on the various assembly diagrams out there. It appears to be 3/4 of an inch across. Anyone know a part number?
 
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