C3.3B Tier 4 Interim and EU Stage 3A Engines for Caterpillar Built Machines – Exhaust Temperature – Test

Table 1
Tools Needed    
Part Number     Part Name     Quantity    
349-4200     Infrared Thermometer     1    

When the engine runs at low idle, the temperature of an exhaust manifold port can indicate the condition of a unit injector:

A low temperature indicates that no fuel is flowing to the cylinder. An inoperative unit injector pump could cause this low temperature.

A very high temperature can indicate that too much fuel is flowing to the cylinder. A malfunctioning unit injector could cause this very high temperature.

Use the 349-4200 Infrared Thermometer to check this exhaust temperature.

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