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 appropriate service manual, preventive maintenance chapter. For crankcase pressure guidelines refer to Service Information Letter 02 TS-20 found on the DDC extranet.
2. Disconnect the air outlet line from the air compressor; see Figure 6-1; refer to appropriate
service manual, special equipment chapter.
3.4.Repeat step 1 and record the test results.
Compare the results of test one with test two.
[a] If the engine crankcase pressure remained the same, check the turbocharger; refer to section 6.4.
[b] If the engine crankcase pressure decreased, replace the air compressor; refer to section 6.3.1.
6.3.1
Air Compressor Removal
Perform the following steps to remove the defective air compressor:
1. Remove the air compressor from the engine; refer to appropriate service manual, special
equipment chapter.
2. Disassemble and repair the air compressor; refer to OEM guidelines.
3. Install the repaired air compressor to the engine; refer to appropriate service manual,
special equipment chapter.
4. Verify repair of the air compressor; refer to section 6.3.1.1.
6.3.1.1
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 appropriate service manual, preventive maintenance chapter.
[a] If the engine crankcase pressure exceeds 1.25 kPa (5 in. H2O), refer to section 6.4. Shut down the engine.
[b] If the engine crankcase pressure is less than1.25 kPa (5 in. H2O), shut down the engine; no further troubleshooting is required.
