Checking The Thermostat - Yamaha 25BMH Wartungshandbuch

POWR
CYLINDER HEAD

CHECKING THE THERMOSTAT

1. Check:
• Thermostat
Damage/stick → Replace.
2. Measure:
• Valve opening temperature
• Valve lift
Out of specification → Replace.
W W W W a a a a t t t t e e e e r r r r t t t t e e e e m m m m p p p p e e e e r r r r a a a a t t t t u u u u r r r r e e e e
B B B B e e e e l l l l o o o o w w w w 48
( ( ( ( 1 1 1 1 1 1 1 1 8 8 8 8 – – – – 1 1 1 1 2 2 2 2 6 6 6 6 ° ° ° ° F F F F ) ) ) )
A A A A b b b b o o o o v v v v e 60
( ( ( ( 1 1 1 1 40
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.
5-23
V V V V a a a a l l l l ve
48 – – – – 52 48 48 52 52 52° ° ° ° C C C C 0 0 0 0 mm
( ( ( ( 0 0 0 0 i i i i n n n n ) ) ) )
e 60 e 60 e 60° ° ° ° C C C C M M M M i i i i n n n n . . . . 3 3 3 3 m m m m m m m m
40° ° ° ° F F F F ) ) ) ) ( ( ( ( 0 0 0 0 . . . . 1 1 1 1 2 2 2 2 i i i i n n n n ) ) ) )
40 40
E
ve li li li lif f f f t t t t ve ve
mm mm mm