Analyzing Diesel Exhaust Smoke - Toro GROUNDSMASTER 325-D Troubleshooting Manual

TORO GM 325-D

Analyzing Diesel Exhaust Smoke.

The exhaust from a diesel engine can provide information about the running condition of the engine. A normally
operating engine will have exhaust that is clear to a slight brownish/gray color.
1. Black Smoke.
Insufficient air.
(Plugged or dirty air filter)
Excessive fuel.
(Leaking injection nozzles)
(Over fueled injection pump setting)
Engine Overloaded.
(Excessive load on engine)
2. Blue Smoke.
High engine oil consumption.
(Worn rings or valve guides)
(Plugged crankcase breather)
3. White Smoke.
Water in combustion chamber.
(Leaking head gasket)
(Cracked cylinder head or cylinder wall)
White smoke can also be caused by the following:
Incorrect injection timing.
Low compression.
(Incomplete combustion)
Low cylinder temperature.
(Faulty glow plugs)
(low ambient air temperature)
Note: White smoke may dissipate when engine warms up.
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Mitsubishi K3D Diesel Engine
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