YAMAHA Marine 100A Manual De Servicio página 270

POWR
CYLINDER HEADS
5260
5265
INSPECTING THE THERMOSTATS
1. Inspect:
• Thermostat
Damage/valve does not open →
Replace.
2. Measure:
• Thermostat opening temperature
• Valve lift a
Out of specification → Replace.
Water temperature
Below 48 - 52 ˚C
(118 - 126 ˚F)
Above 60 ˚C
Measuring steps
(1) Suspend the thermostat in a container
filled with water.
(2) Place a thermometer in the water.
(3) Slowly heat the water.
(4) While stirring the water, check that the
thermostat opens at the specified tem-
perature.
INSPECTING THE CYLINDER HEADS
1. Inspect:
• Combustion chamber
Carbon deposits → Clean.
• Water jacket
Mineral deposits/rust→ Clean.
CAUTION:
Do not scratch the contacting surfaces of
the cylinder head and cylinder head cover.
5-38
Valve lift
Min. 3 mm
(140 ˚F) (0.12 in)
E
5
0 mm
(0 in)
5