1999 "EE" 90, 115 FFI, 150, 175 V4, V6 FFI Outboards Service Repair Manual, P/N 787024, Page 180Get this manual
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Thermostat Servicing Disassembly
1 Position thermostat, spring, and thermostat cover
2 Install the thermostat assembly in the cylinder head 3 Tighten the cover to 120-144 inIbs(13-1