191
COOLING SYSTEM
ENGINE TEMPERATURE CHECK
9
If IDLE temperature is too low, pinch off the water
outlet hoses from pressure relief valve to cylin der
heads.
Use hose p inching pliers (acquired thro ugh local
tool source) to prevent hose damage.
Start the outboard and check IDLE operating tem-
perature using Evinrude Diagnostics software pro-
gram.
If IDLE temp erature increases to spe cific operat-
ing range, 160°F ± 10°F (71°C ± 6°C), after pinch-
ing of f h oses a nd e liminating water flow to th e
cylinder he ads, pressure relief valve is lea king.
Replace pressure relief valve.
If IDLE te mperature is st ill below operating range
with hoses pinche d off, inspect thermostats and
thermostat seals.
Thermostats
Remove thermostat cover(s) and inspect thermo-
stat(s).
Check po sition of thermost at seal a nd how th er-
mostat seals against cylinder head. Seal must be
properly fitted to flange of thermostat.
Check thermost at for cracks, hea t damage, or
signs of corrosion. Check for proper operation.
Thermostat opens at 143°F (62°C).
1. Outlet hoses
2. Pliers
DSC00827
Hose Pinching Pliers DSC00830
004338
1. Seal, thermostat DSC02335
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