Section 8.2 Defective Air Compressor

Section 8.2
Defective Air Compressor

To determine if a defective air compressor is causing excessive crankcase pressure, perform the following:‪

  1. Perform a crankcase pressure test and record the test results;Refer to "2.1 Crankcase Pressure Test" .
  2. Disconnect the air discharge line from the air compressor; see Figure "Air Line Attachments" , refer to MBE 900 Service Manual (6SE9007), special equipment chapter.
    Click to see this graphic in a separate window

     1. Discharge Port‪

     4. Unloader Port‪

     2. Unloader Air Line‪

     5. Discharge Air Line‪

     3. Intake Air Line‪

     6. Air Compressor‪

    Figure 1. Air Line Attachments

  3. Repeat step 1 and record the test results.
  4. Compare the results of test one with test two.
    1. If the engine crankcase pressure remained the same, check the turbocharger; refer to "8.3 Defective Turbocharger" .
    2. If the engine crankcase pressure decreased, repair or replace the air compressor; refer to MBE 900 Service Manual (6SE9007), special equipment chapter.

Section 8.2.1
Test Engine with Repaired Air Compressor

Perform the following steps to determine if a repaired air compressor resolved the excessive crankcase pressure:‪

warning

PERSONAL INJURY

To avoid injury before starting and running the engine, ensure the vehicle is parked on a level surface, parking brake is set, and the wheels are blocked.‪

  1. Start and run the engine.
  2. Perform a crankcase pressure test;Refer to "2.1 Crankcase Pressure Test" .
    1. If the engine crankcase pressure is within 0.62 kPa (2.5 in. H2 O), no further troubleshooting is required. Shut down the engine.
    2. If the engine crankcase pressure is not within 0.62 kPa (2.5 in. H2 O), shut down the engine. Check the turbocharger; refer to "8.3 Defective Turbocharger" .


EPA07 MBE 900 DDEC VI Troubleshooting Guide - 6SE580
Generated on 10-13-2008

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