Thermostat; Ball Bearing - Yamaha 20C Service Manual

POWR
INSPECTION
G64500-0*

THERMOSTAT

Cleaning
1) Using a soft brush and water, remove all traces
of salt, dirt or corrosion.
Inspection
1) Visually inspect the thermostat for damage. If
the thermostat is damage, or if it is opens when
cold, replace it.
2) Immerse the thermostat in water, and heat the
water gradually. Check the valve opening tem-
perature and the valve lift.
Water
temperature
58.0°C (136.4°F)
58.0 – 62.0°C
(136.4 – 143.6°F)
70.0°C (158.0°F)
If the valve opening and or temperature and
valve-lift are not within the specifications,
replace the thermostat
G65000-0*

BALL BEARING

Cleaning
1) Using a soft brush and solvent, thoroughly
clean the bearing. Dry it with air, and sparingly
lubricate it with 2-stroke outboard motor oil.
cC
Blow-dry the bearing without spinning it or
making scratches on the bearing balls.
Inspection
1) Hold the bearing inner race and slowly turn the
bearing outer race with your fingers. If any
rough spots are felt, replace the bearing.
5-22
E
Valve lift
0 mm
Opening sequence
begins
Minimum 3.0 mm
(0.12 in)