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SERIES 50 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 Section in this manual.
  2. Disconnect the air outlet line from the air compressor; see Figure 21665 ; refer to Section .

    Air Compressor Air Outlet Line

  3. Repeat step 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 Section .
    2. If the engine crankcase pressure decreased, repair the air compressor; refer to Section .

Air Compressor Repair

Perform the following steps to repair the defective air compressor: ‪

  1. Remove the air compressor from the engine; refer to Section .
  2. Disassemble and repair the air compressor; refer to OEM guidelines.
  3. Install the repaired air compressor to the engine; refer to Section .
  4. Verify repair of the air compressor; refer to Section .
Test Engine with Repaired Air Compressor

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

  1. Start and run the engine.
  2. Perform a crankcase pressure test; refer to Section .
    1. If the engine crankcase pressure exceeds 3 in. H2 O (0.75 kPa); refer to Section . Shut the engine down.
    2. If the engine crankcase pressure is within 3 in. H2 O (0.75 kPa), shut down the engine; no further troubleshooting is required.