161 50940193/DP0415
Exhaust excessively
smoky
Black smoke
Black smoke indicates poor and incomplete
diesel fuel combustion, which could be caused
by:
• Incorrect timing.
• Dirty or worn injectors.
• Incorrect valve clearance.
• Incorrect air/fuel ratio.
• Low cylinder compression.
• Dirty air cleaner.
• Restricted induction system.
• Faulty engine tuning.
• Poor quality fuel.
• Carbon build-up in combustion and exhaust
spaces.
• Cool operating temperatures.
Blue smoke
Blue smoke indicates engine oil combustion,
which could be caused by:
• Worn valve guides or seals.
• Wear in cylinders, piston rings, ring grooves,
etc.
• Cylinder glaze.
• Sticking piston ring.
• Incorrect engine oil grade.
• Fuel dilution in engine oil.
White smoke
White smoke indicates incomplete diesel
combustion, or coolant in the combustion
chamber, which could be caused by:
• Faulty or damaged injectors.
• Incorrect injection timing.
• Low cylinder compression.
• Faulty head gaskets.
• Cracked cylinder heads/blocks.
Table 23: Engine Troubleshooting
Problem Possible Cause Corrective Action
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