1-S2
ZD25F, WSM
ENGINE
W1010717
Symptom Probable Cause Solution
Reference
Page
Engine Revolution Is
Not Smooth
• Fuel filter clogged or dirty
• Air cleaner clogged
• Fuel leak due to loose injection pipe retaining
nut
• Injection pump malfunctioning
• Incorrect nozzle injection pressure
• Injection nozzle stuck or clogged
• Governor malfunctioning
Replace fuel filter
Clean or replace air
cleaner element.
Tighten retaining nut
Repair or replace
injection pump
Adjust nozzle
injection pressure
Repair or replace
injection nozzle
Repair governor
G-32
G-24
1-S18
1-S22
–
1-S52
1-S23
Either White or Blue
Exhaust Gas Is
Observed
• Excessive engine oil
• Piston ring and cylinder worn or stock
• Incorrect injection timing
• Deficient compression
Reduce to specified
engine oil level
Repair piston ring
and bore oversize
piston
Adjust injection
timing
Replace each
bearings
–
1-S26
–
1-S28, S37
Either Black or Dark
Gray Exhaust Gas Is
Observed
• Overload
• Low grade fuel used
• Fuel filter clogged
• Air cleaner clogged
• Deficient nozzle injection
Lessen load
Use specified fuel
Replace fuel filter
Clean or replace air
cleaner element
Repair or replace
nozzle
–
–
G-32
G-24
1-S52
Deficient Output • Incorrect injection timing
• Engine's moving parts seem to be seized.
• Uneven fuel injection
• Deficient nozzle injection
• Compression leak from cylinder
Adjust injection
timing
Repair or replace
engine’s moving
parts
Repair or replace
injection pump
Repair or replace
nozzle
Replace head
gasket, tighten
cylinder head screws,
glow plugs and
nozzle holders.
–
–
1-S22
1-S52
1-S19
Excessive Lubricant
Oil Consumption
• 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
Shift ring gap
direction
Replace oil ring
Replace piston
Replace valve and
valve guide
Replace defective
seals or packing
1-S25
1-S26
1-S26
1-S20, S30
–
To Next Page
Loading...
Need help?
General
