There was a production change in the ’57 models where they changed the outside diameter of the seal. If you have the 302495 in there now, that’s what you need again. Unfortunately, it’s more expensive than the 313284. Chris-P here on the forum was making some 302495 seals some time ago at a good price – maybe he will see this and weigh in.
Edit – I think the 302495 is like 1-1/2″ OD and the 313284 is 1-1/8″ OD. Just went through this on my ’57 18hp. Mine had the later 1-1/8″ seal. I’ve seen various stories saying the production change was made on motor serial numbers 7000 and up and other saying it was on models serial number 22000 and up.
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."
