Mercury Force 9.9, 15HP Outboards Service Manual, Page 156Get this manual
4 Reassemble exhaust cover Secure exhaust cover assembly to powerhead with screws
NO TE: Be sure to lationuse new gaskets in
Torque exhaust cover screws to 90 lb in (10.3 Nm)
IREMOVING THERMOSTAT
123Remove screws securing thermostat cover to motor leg Remove thermostat assemblyRemove gasket