Cooling System
Engine Temperature Check
220
Start the outboard and check IDLE operating tem-
perature.
If IDLE temperature is too low, pinch off the water
hose from the cylinder heads to the pressure relief
valve.
Use hose pinching pliers (acquired through local
tool source) to prevent hose damage.
Start the outboard and check IDLE operating tem-
perature using Evinrude Diagnostics software,
v 6.1 or higher.
If IDLE temperature increases to specific operat-
ing range, 140°F ± 10°F (60°C ± 6°C), after pinch-
ing off hoses and eliminating water flow to the
pressure relief valve, the pressure relief valve is
leaking. Clean or replace the pressure relief valve
as needed.
If IDLE temperature is still below operating range
with hoses pinched off, inspect thermostats and
thermostat seals.
Thermostats
Remove thermostat cover(s) and inspect thermo-
stat(s).
Check position of thermostat seal and how ther-
mostat seals against cylinder head. Seal must be
properly fitted to flange of thermostat.
Check thermostat for cracks, heat damage, or
signs of corrosion. Check for proper operation.
Thermostat opens at 143°F (62°C).
1. Outlet hose
009263
Hose Pinching Pliers
009253
009264
1. Seal, thermostat
009261
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