3.9 and B5.9 Series Engines
Troubleshooting Symptoms Charts
Section TS - Troubleshooting Symptoms
Air Compressor Noise is Excessive
This is symptom tree T006.
Check for carbon buildup. Replace the air
compressor discharge line if necessary. Check
Carbon buildup is excessive in the air dis-
the turbocharger for oil leaks. Refer to Proce-
charge line, check valve, or cylinder head
For all models, check for ice in low spots of the
air discharge line, dryer inlet, and elbow
fittings. On Holset models, also check the
ce buildup in the air system components
Econ valve (if equipped). Refer to the Master
Bulletin No. 3666121
ir compressor mounting hardware is loose,
Check air compressor mounting hardware.
worn, or broken
Refer to Procedure 012-014.
Check the accessory drive axial end play.
ccessory drive is worn (axial end play is out
Inspect the shaft for wear.Refer to Procedure
Inspect the drive gears and gear train and
repair as necessary. Refer to the Master
ir compressor drive gear or engine gear train
is worn or damaged
Bulletin No. 3666121.
Check the air compressor timing. Refer to the
Master Repair Manual, Holset Air Compres-
sor, Bulletin No. 3666121.
plined drive coupling or gear is excessively
Check the coupling for wear. Refer to Proce-