1-S2
L3130 · L3430 · L3830 · L4630 · L5030, WSM
ENGINE
W1014322
Symptom Probable Cause Solution
Reference
Page
Either Black or Dark
Gray Exhaust Gas Is
Observe
•Overload
• Low grade fuel used
• Fuel filter clogged
• Air cleaner clogged
• Deficient nozzle injection
Lessen the load
Use the specified fuel
Change
Clean or change
Repair or replace the
nozzle
–
G-7, 8
G-31
G-22
1-S29
Deficient Output • Incorrect injection timing
• Engine’s moving parts seem to be seizing
• Uneven fuel injection
• Deficient nozzle injection
• Compression leak
Adjust
Repair or replace
Repair or replace the
injection pump
Repair or replace the
nozzle
Replace head
gasket, tighten
cylinder head bolt,
glow plug and nozzle
holder
1-S64
–
1-S32
1-S29, S65
1-S29, S30
Excessive Lubricant
Oil Consumption
• Piston ring’s gap facing the same direction
• Oil ring worn or stuck
• Piston ring groove worn
• Valve stem and guide worn
• Oil leaking due to defective seals or packing
Shift ring gap
direction
Replace
Replace the piston
Replace
Replace
1-S40
1-S40
1-S39, S40
1-S31
–
Fuel Mixed Into
Lubricant Oil
• Injection pump’s plunger worn
• Deficient nozzle injection
• Injection pump broken
Replace pump
element or pump
Repair or replace the
nozzle
Replace
1-S32
1-S29, S65
1-S32
Water Mixed Into
Lubricant Oil
• Head gasket defective
• Cylinder block or cylinder head flawed
Replace
Replace
1-S30
1-S30
Low Oil Pressure • Engine oil insufficient
• Oil straight clogged
• Relief valve stuck with dirt
• Relief valve spring weaken or broken
• Excessive oil clearance of crankshaft bearing
• Excessive oil clearance of crankpin bearing
• Excessive oil clearance of rocker arm
• Oil passage clogged
• Different type of oil
• Oil Pump defective
Replenish
Clean
Clean
Replace
Replace
Replace
Replace
Clean
Use the specified
type of oil
Repair or replace
G-7, 8
1-S38
–
–
1-S43
1-S43
1-S30
–
G-7, 8
1-S37
High Oil Pressure • Difference type oil
• Relief valve defective
Use the specified
type of oil
Replace
G-7, 8
–
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