Cylinder Head Servicing; Checking Compression Pressure - Kubota D1102-B Workshop Manual

3.SERVICING
C
Ol 9 F011
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Checking Compression Pressure

1) ) Warm u p the engine.
2) R emove the ai r cleaner a nd th e m uffler.
Remove the nozzl e hol ders from al l the cy l i nd ers.
3)
a
Attach compression tester to the cyl i nder to be measu r-
4)
ed.
5) R u n the engine wi th the starter at 200 to 300 mi n-1{rpm)
and read constan t maxi m u m on the tester. E xecu te the
test at least twice. ( R u n the engi ne for 5 to 10 seconds
for each test.)
• For the test, use a f ully charged battery and the specif ied
valve clearance.
• If the compression pressure is below the given allowa ble
l i mit, pour a small amount of oi l through the nozzle
holder hole and test again.
• Judgment.
1) If the pressu re recovers to standard level, i nadequate
pressure may be ca used by wear or adhesion of the piston
rings. Check the related poi nts.
2) If the pressu re does not recover, cylinder head or valve
problems may be the cause. Check the related points.
3) If the compression d iff ers more than 10% a mong the
cylinders, trace the cause of pressure variation and take
corrective measures.
Reference compression pressure
Compression pressure allowable
limit should be more than 75%
of reference compression
pressure
-
Difference in compression pressure among cylinders should be
ss than 10%.
49
Reference value
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·--
2.9 to 3.2 MPa
30 to 33 kgf/cm
427 to 469 lb./sq. in.
··-•-H-•-•••-
2.2 to 4.2 MPa
23 to 25 kgf/cm
320 to 352 lb./sq.in.
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KiSC issued 09, 2007 A
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