Kubota WSM J Series Workshop Manual page 62

J SERIES, WSM
Symptom
Either White or Blue
Exhaust Gas Is
Observed.
Either Black or Dark
Gray Exhaust Gas Is
Observed.
Deficient Output
Excessive Lubricant
Oil Consumption
Fuel Mixed into
Lubricant Oil
Probable Cause
• Excessive engine oil
• Low grade fuel used
• Piston ring and liner worn or stuck
• Incorrect injection timing
• Overload
• Low grade fuel used
• Fuel filter clogged
• Air cleaner clogged
• Deficient nozzle injection
• Incorrect injection timing
• Engine's moving parts seem to be seizing
• Injection pump malfunctioning
• Deficient nozzle injection
• Compression leak
• Air cleaner dirty or clogged
• Piston ring's gap facing the same direction
• Oil ring worn or stuck
• Piston ring groove worn
• Valve stem and valve guide worn
• Oil leaking due to defective seals or packing
• Injection pump's plunger worn
• Deficient nozzle injection
• Injection pump broken
Reduce to specified
level
Use specified fuel
Repair or replace
Adjust
Lessen load
Use specified fuel
Clean or change
Clean or change
Repair or replace
nozzle
Adjust
Repair or replace
Repair or replace
Repair or replace
nozzle
Check the
compression
pressure and repair
Clean or replace
Shift ring gap
direction
Replace
Replace piston
Replace
Replace
Replace pump
element or injection
pump
Repair or replace
nozzle
Replace
S-16
GENERAL
Reference
Solution
Page
S-38
S-3
S-89, 99
S-105
–
S-3
S-40
S-40
S-106
S-105
–
–
S-106
S-58
S-40
S-72, 73
S-72, 73, 89
S-72, 73, 89
S-78
–
–
S-106
–
W11387480
KiSC issued 10, 2016 A