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CHK
ADJ
MEASURING THE COMPRESSION PRESSURE
Compression pressure
(with oil applied into the cylinder)
Reading
Higher than without oil
Same as without oil
Diagnosis
Piston ring(s) wear or
damage J Repair.
Piston, valves, cylinder
head gasket or piston
possibly defective J
Repair.
7. Measure:
8compression pressure
Out of specification J Refer to steps (c)
and (d).
Compression pressure (at sea level)
Minimum
1175kPa(11.8kgf/cm
2
, 167psi) at
1800r/min
Standard
1350kPa(13.5kgf/cm
2
, 192psi) at
1800r/min
Maximum
1512kPa(15.1kgf/cm
2
, 215psi) at
1800r/min
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a. Set the main switch to “ON”.
b. With the throttle wide open, crank the en-
gine until the reading on the compression
gauge stabilizes.
WARNING
To prevent sparking, ground the spark plug
lead before cranking the engine.
c. If the compression pressure is above the
maximum specification, check the cylinder
head, valve surfaces, and piston crown for
carbon deposits.
Carbon deposits J Eliminate.
d. If the compression pressure is below the
minimum specification, pour a teaspoonful
engine of oil into the spark plug bore and
measure again.
Refer to the following table.
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