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
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