ENGINE
S y m p t o m
Probable Cause
S o l u t i o n
• Excessive engine oil
Reduce to the specified level
Either White or
• Piston ring and bore worn or stuck
Repair or replace
Blue Exhaust
• Incorrect injection timing
A d j u s t
Gas is Observed
• Deficient compression
Adjust top clearance
Either Black or
• Overhead
Lessen the load
Dark Gray
• Low grade fuel used
Use the specified fuel
Exhaust Gas is
• Fuel filter clogged Clean or replace
Clean or replace
O b s e r v e d
• Air cleaner clogged
Clean or replace
• Incorrect injection timing
A d j u s t
• Engine’s moving parts seem to be
Repair or replace
s e i z i n g
D e f i c i e n t
• Uneven fuel injection
Repair or replace the injection pump
O u t p u t
• Deficient nozzle injection
Repair or replace the nozzle
• Compression leak
Replace head gasket, tighten
cylinder head screw and nut, glow
plug and nozzle holder
• Piston ring’s gap facing the
Shift ring gap direction
same direction
E x c e s s i v e
• Oil ring worn or stuck
R e p l a c e
Lubrication Oil
• Piston ring groove worn
Replace the piston
C o n s u m p t i o n
• Valve stem and guide worn
R e p l a c e
• Crankshaft bearing, and crank pin
R e p l a c e
bearing worn
Fuel Mixed into
• Injection pump’s plunger worn
Replace pump element or pump
Lubricating Oil
• Fuel transfer pump broken
R e p l a c e
Water Mixed
• Head gasket defective
R e p l a c e
i n t o
• Cylinder block or cylinder head
R e p l a c e
Lubricating oil
f l a w e d
• Engine oil insufficient
R e p l e n i s h
• Oil strainer closed C l e a n
C l e a n
• Oil filter cartridge clogged
R e p l a c e
• Relief valve stuck with dirt
C l e a n
• Relief valve spring weaken or broken
R e p l a c e
• Excessive oil clearance of crankshaft
R e p l a c e
Low Oil
b e a r i n g
P r e s s u r e
• Excessive oil clearance of crank pin
R e p l a c e
b e a r i n g
• Excessive oil clearance of rocker arm
R e p l a c e
b u s h i n g
• Oil passage closed
C l e a n
C l e a n
• Improper type of oil
Use the specified type of oil
• Oil pump defective
Repair or replace
