Reply To: 1975 Johnson 15R75C 15 hp

[Steve D]

I’ve only worked on a couple motors from that era Buc, and never had to try and remove the water jacket to check or replace the thermostat.  Is it possible that maybe once you move the hose out of the way, and remove the spark plug and wire, there might be just enough room to get a box wrench on that lower screw and possibly enough clearance for it to be fully backed out?  I’m sure someone with more experience with those (maybe fleetwin?) will shed some light on it.