Series 50 – Section 20.2 Defective Air Compressor

Section 20.2
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 "29.3 Crankcase Pressure Test (Governed Speed No Load)" .
2. Disconnect the air outlet line from the air compressor; see Figure "Air Compressor Air Outlet Line" ; refer to "10.1.2 Cleaning and Removal of Air Compressor" .
   

   Figure 1. Air Compressor Air Outlet Line

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 "20.3 Defective Turbocharger" .
   2. If the engine crankcase pressure decreased, repair the air compressor; refer to "20.2.1 Air Compressor Repair" .

Section 20.2.1
Air Compressor Repair

Perform the following steps to repair the defective air compressor:‪

1. Remove the air compressor from the engine; refer to "10.1.2 Cleaning and Removal of Air Compressor" .
2. Disassemble and repair the air compressor; refer to "10.1.3 Inspection of Air Compressor" .
3. Install the repaired air compressor to the engine; refer to "10.1.4 Installation of Air Compressor" .
4. Verify repair of the air compressor; refer to "20.2.1.1 Test Engine with Repaired Air Compressor" .

Section 20.2.1.1
Test Engine with Repaired Air Compressor

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

1. Start and run the engine.
2. Perform a crankcase pressure test; refer to "29.3 Crankcase Pressure Test (Governed Speed No Load)" .
   1. If the engine crankcase pressure is within 3 in. H₂ O (0.75 kPa), no further troubleshooting is required. Shut the engine down.
   2. If the engine crankcase pressure is not within 3 in. H₂ O (0.75 kPa). Shut the engine down, refer to "20.3 Defective Turbocharger" .