TM 5-3805-293-23-1
0011
Table 1. Engine Troubleshooting Procedures for the 120M Motor Grader - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
14. Excessive Fuel Con-
Secondary Fuel Filter and Water
sumption - Continued
Separator Damaged or
Contaminated - Replace secondary
fuel filter (WP 0073).
4. 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
components (WP 0115, WP 0078, and
WP 0103).
5. Inspect exhaust system for
Exhaust System is Blocked -
damage and blockage (WP
Remove blockage (WP 0037).
0037).
Exhaust System Components are
Damaged - Replace damaged
components (WP 0077, WP 0063,
and WP 0079).
Water Temperature Regulator
6. Remove water temperature regu-
Obstructed or Stuck Open - Replace
lator (WP 0081). Inspect water
water temperature regulator (WP
temperature regulator for obstruc-
0081).
tion and for being stuck open.
Water Temperature Regulator OK -
Install water temperature regulator
(WP 0081).
N OT E
If the pressure of the intake air at the intake manifold is lower than
normal, either the speed of the engine will need to be higher, or more
fuel must be injected in order to produce the same power. Either of
these conditions will increase fuel consumption.
Low pressure in the air intakewill create a 526-07 diagnostic code.
7. Inspect turbocharger (WP 0037).
Turbocharger Faulty - Replace
turbocharger (WP 0077).
Turbocharger Components
Damaged or Restricted - Replace
turbocharger components (WP 0077)
or clear restriction (WP 0037).
8. Check the valve lash. Refer to
Out of Adjustment - Adjust engine
Systems Operation, Testing and
valve lash (WP 0032).
Adjusting, Engine Valve Lash
Adjustment (WP 0032).
Change 1
0011-14