A Series Diesel Engine Air System 99
Intake Air, Exhaust and
Fuel System
A2300
Intake Restriction at Rated Speed and Load with Dirty Air
Filter Element – kPa [mmAq]
6.23 [635]
Exhaust Restriction at Rated Speed and Load – kPa [mmAq] 7.65 [780]
Diagnosing Air System Malfunctions
The correct amount of clean air to the cylinders is
required for good performance. As discussed earlier
in System Air Flow, ingested dust and dirt will manage
the engine cylinders. Dust and dirt can also damage
the valve stems and guides. Larger debris can
damaged the blades of the turbocharger.
Air Flow Restriction Results in
Excess Smoke and Low Power
Restriction increases as the filter removes
contaminants from the intake air. Restricted air flow
changes the air-to-fuel ratio, reducing power and
increasing smoke from the engine. Verify that the air
cleaner is being maintained correctly.
Measurement of air intake restriction is described in
this Section.
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