I believe that motor uses the wobbler rotor style water pump – part numbers are:
Wobbler rotor is OMC #550683
gasket for the gearcase housing is 550681
the eccentric cam for the rotor is 550671
the propshaft seal is 550684
I rebuilt a ’57 Sea King 3hp a couple years ago and those are the part numbers I used for that job. I also have a parts list for a ’62 Sea King 3hp and they have the same part numbers so I’m sure yours would be the same. I found all these parts readily available on Ebay. Hope this helps.
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
“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."