ENGINE
SM-E4B SERIES, WSM
1-S2
Engine Revolution Is
Not Smooth
Fuel filter clogged or dirty Replace G-17
Air cleaner clogged Clean or replace G-14
Fuel leak due to loose injection pipe retaining nut Tighten retaining nut 1-S31
Injection pump malfunctioning Repair or replace G-28,
1-S21
Incorrect nozzle injection pressure Adjust G-24
Injection nozzle stuck or clogged Repair or replace G-24
Governor malfunctioning Repair 1-S45
Either White or Blue
Exhaust Gas Is
Observed
Excessive engine oil Reduce to specified
level
I-4,
G-7,
G-9
Piston ring and cylinder worn or stuck Repair or replace 1-S60,
1-S61
Incorrect injection timing Adjust I-4,
G-26
Either Black or Dark
Gray Exhaust Gas Is
Observed
Overload Reduce the load I-4
Low grade fuel used Use specified fuel I-4,
G-6
Fuel filter clogged Replace G-17
Air cleaner clogged Clean or replace G-14
Deficient nozzle injection Repair or replace
nozzle
G-24
Deficient Output Incorrect injection timing Adjust I-4,
G-26
Engine's moving parts seem to be seizing Repair or replace 1-S39,
1-S45
Injection pump malfunctioning Repair or replace G-28,
1-S21
Deficient nozzle injection Repair or replace
nozzle
G-28
Compression leak Check the
compression
pressure and repair
1-S14,
1-S32
Excessive Lubricant
Oil Consumption
Piston ring's gap facing the same direction Shift ring gap
direction
1-S41
Oil ring worn or stuck Replace 1-S42
Piston ring groove worn Replace piston 1-S61
Valve stem and valve guide worn Replace 1-S52
Crankshaft bearing and crank pin bearing worn Replace 1-S61,
1-S63
Oil leaking due to defective seals or packing Replace 1-S67
Fuel Mixed into
Lubricant Oil
Injection pump's plunger worn Repair or replace G-28
Deficient nozzle injection Repair or replace
nozzle
G-24
Injection pump broken Replace G-28
Symptom Probable Cause Solution
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