1971 Evinrude Fisherman 6HP outboards Service Manual, Page 39Get this manual
Two Thermomelt Stiks are necessary to check motor125 Stik and 163 StikWith the engine at operating temperature the 125 mark should melt and the 163 mark should not melt0 0
Remove power head and place on bench fordisassembly
If the 125
mark does not melt after reasonable length of time, the thermostat is stuck open and the motor is running too coldIf the 163 mark also melts, the cooling system is not functioning properly, allowing the motor to overheatCheck for worn pump assembly, leaky water system, or restrictions in the cooling system
DISASSEMBL OF POWER HEAD
aRemove cylinder head and cylinder head gasket, and inner and outer exhaust covers and gasketsSee Figure 5-6
REMOVAL OF POWER HEAD
aRemove carburetor, leaf valve assembly, fuel pump and filter, and fuel hoses as described in Section 3bRemove flywheel and magneto as described in Section 4Remove starter as described in Section 7cRemove throttle control lever by removing two screws and clamps, and lifting lever from lower motor coverdRemove retaining ring and armature plate supporteRemove seven screws attaching power head to exhaust housing assemblySee Figure 5-5Figure 5-5Power Head Attaching Screws