To determine if an obstructed or damaged breather is causing excessive crankcase pressure,
perform the following:
1.Perform a crankcase pressure test. 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. Check the results, if the engine crankcase pressure is greater than 1.25 kPa (5 in. H2O),
replace wire mesh element. Refer to section 7.1.1.
7.1.1
Rocker Cover Breather Resolution
Perform the following steps to replace wire mesh element replacement:
1. Remove the valve rocker cover(s) (one-piece, two piece, three piece); refer to appropriate
service manual, engine chapter.
2. Remove the wire mesh form the rocker cover; refer to appropriate service manual, engine
chapter.
3. Install a new wire mesh element to the rocker cover; refer to appropriate service manual,
engine chapter.
4. Install the rocker cover to the engine; (one-piece, two piece, three piece) refer to
appropriate service manual, engine chapter.
5. Verify replacement of wire mesh element; refer to section 7.1.1.1.
7.1.1.1
Test Engine with New Wire Mesh Element
Perform the following steps to determine if the new wire mesh element 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. For crankcase pressure guidelines refer to Service Information Letter 02 TS-20 found on the DDC extranet.
[a] If the engine crankcase pressure is less than 1.25 kPa (5 in. H2O), no further troubleshooting is required. Shut down the engine.
[b] If the engine crankcase pressure is greater than 1.25 kPa (5 in. H O), check the air compressor; refer to section 7.2. Shut down the engine.
