Leaving the shaft O-ring out during reassembly can be fatal to any motor. During disassembly of my 57 Fastwin, I found the driveshaft O-ring missing or long gone. Here’s what the crankshaft and driveshaft splines looked like.
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."