3-14
COMPRESSION PRESSURE MEASUREMENT
INSP
ADJ
NOTE:
CAUTION:
EB303060
COMPRESSION PRESSURE
MEASUREMENT
Insufficient compression pressure will result in a
loss of performance.
1. Check:
Valve clearance
Out of specification Adjust.
Refer to “VALVE CLEARANCE ADJUST-
MENT”.
2. Start the engine and let it warm up for sev-
eral minutes.
3. Stop the engine.
4. Remove:
Spark plug caps
Spark plugs
Before removing the spark plugs, use com-
pressed air to blow away any dirt accumu-
lated in the spark plug wells, to prevent it
from falling into the cylinders.
5. Attach:
Compression gauge
1
Compression gauge set:
90890-03081
6. Measure:
Compression pressure
If it exceeds the maximum pressure al-
lowed Inspect the cylinder head, valve
surfaces and piston crown for carbon de-
posits.
If it is below the minimum pressure
Squirt a few drops of oil into the affected
cylinder and measure again.
Refer to the table below.
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