MBE 900 & MBE 4000 EGR

Section 7.1 Normal Engine Operation Snapshots

Section 7.1
Normal Engine Operation Snapshots

It is important to understand what Normal looks like during normal engine operation, all parameters should have smooth transitions.‪

Review the snapshots in this section for examples of typical engine operation.‪

Section 7.1.1
COLD ENGINE AT IDLE

For a cold engine at idle, the EGR valve is closed and the EGR temperature after the EGR cooler is well below the engine coolant temperature. See Figure "Cold MBE 900 Engine at Idle — Diagnostic Instrumentation Window" and Figure "Cold MBE 900 Engine at Idle — Graph Window" for an MBE 900 engine operating at idle. ‪

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Figure 1. Cold MBE 900 Engine at Idle — Diagnostic Instrumentation Window

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Figure 2. Cold MBE 900 Engine at Idle — Graph Window

Section 7.1.2
WARM ENGINE WITH NO LOAD

As the engine warms up, the EGR valve opens and the EGR temperature after the EGR cooler approaches the engine coolant temperature. See Figure "MBE 900 Engine Warming up at Intermediate Speeds — Diagnostic Instrumentation Window" and Figure "MBE 900 Engine Warming up at Intermediate Speeds — Graph Window" for an MBE 900 engine warming up with no load.‪

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Figure 3. MBE 900 Engine Warming up at Intermediate Speeds — Diagnostic Instrumentation Window

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Figure 4. MBE 900 Engine Warming up at Intermediate Speeds — Graph Window

Section 7.1.3
MBE 4000 ENGINE AT VARIABLE SPEEDS AND LOADS

This snapshot is an MBE 4000 engine operating at low vehicle speeds but variable engine speeds and loads. In this snapshot, the engine coolant is at operating temperature. See Figure "MBE 4000 Engine at Low Vehicle Speed" .‪

Note: The EGR temperature slowly builds while the coolant temperature remains steady.

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Figure 5. MBE 4000 Engine at Low Vehicle Speed

Section 7.1.4
MBE 900 ENGINE AT VARIABLE SPEEDS AND LOADS

This snapshot is an MBE 900 engine operating at low vehicle speeds but variable engine speeds and loads. In this snapshot, the engine coolant is at operating temperature. See Figure "MBE 900 Engine at Low Vehicle Speed" .‪

Note: The EGR temperature slowly builds while the coolant temperature remains steady.

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Figure 6. MBE 900 Engine at Low Vehicle Speed


MBE 900 and MBE 4000 EGR Technician's Manual - 7SE940
Generated on 10-13-2008

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