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7. Lubrication system
127
Failure Diagnosis
Lubrication
oil pressure
(kPa)
Idle speed
Min. 100
Governed
speed
Min. 250
Max. oil temperature (
°
C)
120
Oil specifica-
tion
Oil class
above API CD
SAE
15W/40
Item
DP222L
Remarks
DP222LAS
DP222LBS
DP222LBF
DP222LCS
DP222LCF
Phenomenon
Causes
Troubleshooting
Too much oil consumption
Bad oil
Replace oil with specified oil.
Oil leakage from the oil seal ring and packing part Replace it
Worn or damaged piston and piston ring
Replace it
Worn cylinder liner
Replace it
Burnt piston ring
Replace it
Worn valve guide oil seal, valve guide, or valve
stem
Replace it
Low oil pressure
Bad oil
Replace oil with specified oil.
Burnt oil pump relief valve
Replace it
Clogged oil pump strainer
Cleanse the strainer
Worn oil pump gear
Replace it
Cracked oil delivery pipe of the oil pump
Replace it
Defect oil pump
Repair or replace it
Oil pressure gauge fault
Repair or replace it
Worn bearings
Replace it
Contaminated oil
Clogged oil filter
Replace the oil filter with a new
one
Gas leakage
Replace piston ring with a new one
Bad oil
Replace oil with specified oil.