MBE 900 DDEC VI Troubleshooting

Section 7.4 Defective Air Compressor

Section 7.4
Defective Air Compressor

To determine if a defective air compressor is causing excessive oil consumption, 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 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 "7.5 Defective Turbocharger" .
    2. If the engine crankcase pressure decreased, replace the air compressor; refer to MBE 900 Service Manual (6SE9007), special equipment chapter. Verify the replaced (or new) air compressor, refer to "7.4.1 Test Engine with Repaired Air Compressor" .

Section 7.4.1
Test Engine with Repaired Air Compressor

Perform the following steps to determine if the replaced (or new) 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 exceeds 0.62 kPa (2.5 in. H2 O), shut down the engine. Check for defective turbocharger. refer to "7.5 Defective Turbocharger" .
    2. If the engine crankcase pressure is within 0.62 kPa (2.5 in. H2 O), shut down the engine; no further troubleshooting is required.


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

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