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3. SERVICING
0076P049
o
Checking Compression Pressure
1) Warm up the engine.
2)
Remove the air cleaner and the nozzle holders from all the
cylinders.
3)
Set a compresson tester to the cylinder to be measur·
ed.
4) Run the engine with the starter at 200 to 300 rpm and
read constant maximum on the tester. Execute the test at
least twice. (Run the engine for 5 to 10 seconds for each
test.)
• For the test, use a fully charged battery and the specified
valve clearance.
• If the compression pressure is below the given allowable
limit, pour a small amount of oil through the nozzle
holder hole and test again.
• Judgment
1) If the pressure recovers to the standard level, inadequate
pressure may be caused by wear or adhesion of the piston
rings. Check the related points.
2) If the pressure does not recover, cylinder head or valve
problems may be the cause. Check the related points.
3) If the compression differs more than 10% among the
cylinders, trace the cause of pressure variation and take
corrective measures.
TEST EQUIPMENT:
Compression tester (Code No. : 07909·30201)
Reference value
Refer,an(:e compression pressure
pressure allowable
be more than 75% of
•
Difference in compression pressure among cylinders should be
within 10%.
150
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