TM 5-3805-293-23-1
0011
Table 1. Engine Troubleshooting Procedures for the 120M Motor Grader - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
12. Excessive Black Smoke
1. Connect MSD (WP 0006). Select
Active Diagnostic Fault Code -
Engine ECM C6.6 120M and
Troubleshoot fault codes (WP 0010).
check for any active event or
diagnostic fault codes.
2. Inspect air inlet system for
Air Inlet System is Blocked or Dirty
damage, blockage, and
- Clean and remove blockage from air
cleanliness (WP 0037).
inlet system components (WP 0037).
Air Inlet System Components are
Damaged - Replace damaged com-
ponents (WP 0115, WP 0078, and WP
0103).
3. Inspect exhaust system for
Exhaust System is Blocked -
damage, blockage, and
Remove blockage (WP 0037).
cleanliness (WP 0037).
Exhaust System Components are
Damaged - Replace damaged com-
ponents (WP 0077, WP 0076, WP
0063, and WP 0079).
4. Check the valve lash. Refer to
Out of adjustment - Adjust engine
Engine Valve Lash Inspect/Adjust
valve lash (WP 0032).
(WP 0032).
5. Perform Engine Cylinder Cutout
Diagnostic Code Active During
Test (WP 0035).
Test - Proceed to (WP 0010) for
troubleshooting.
Injector Diagnostic Codes are Not
Active or Logged - Fault may be
engine mechanical related. Refer to
Engine Misfires, Runs Rough, or is
Unstable in this work package.
Active Event or Diagnostic Codes
13. Excessive Oil Consump- 1. Connect MSD (WP 0006). Select
Found - Troubleshoot any active
tion
Engine ECM C6.6 120M and
codes before continuing with
check for any active event or
troubleshooting (WP 0010).
diagnostic fault codes.
2. Check the oil level in the engine
Oil High - Drain excess oil (WP
(WP 0087).
0087).
Oil Low - Add oil as needed (WP
0087).
3. Check for evidence of oil leaks
Leaks Found - Replace valve
around valve mechanism cover
mechanism cover gasket (WP 0103).
(WP 0103).
4. Check for evidence of oil in the
coolant. Refer to Coolant in
Engine Oil or Engine Oil in Cool-
ant in this work package.
0011-12