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 TM 5-685/NAVFAC MO-912
Table 3-5. Diesel engines troubleshooting-Continued
analysis of failure. This is especially important
when specific failures become repetitive over a pe-
EXCESSIVE SMOKING AT IDLE
riod of time which may be years.
Remedy
Cause
(2) Log sheet data. Log sheets should include
Clean all injectors, refer to appendix G. Refer
Clogged injector.
engine starts and stops, fuel and lubrication oil con-
Leaking head gasket
to manufacturer's instruction and correct as
sumption, and a cumulative record of the following:
or blowby. Engine due
required. Schedule the overhaul and correct as
(a) Hours since last oil change.
for overhaul. Incorrect
required. Perform timing procedures. refer to
timing.
appendix G.
(b) Hours since last overhaul.
(c) Total hours on engine.
EXCESSIVE SMOKING UNDER LOAD
(d) Selected t emperatures and pressures.
The same remedies for "idle" apply.
The same causes for
b. Troubleshooting. Perform troubleshooting pro-
"idle" apply.
cedures when abnormal operation of the equipment
Air intake restricted.
Check air intake and correct as required.
is observed. Maintenance personnel should then re-
Check exhaust system and turbocharger; correct
High exhaust back
fer to log sheets for interpretation and comparison
pressure.
as required.
of performance data. Comparisons of operation
Poor quality fuel.
Replenish fuel supply with fresh, proper quality
should be made under similar conditions of load and
fuel.
ambient temperature. The general scheme for
troubleshooting is outlined in the following para-
Engine overloaded.
Reduce load to proper ievel.
graphs.
LOW POWER OR LOSS OF POWER
(1) Industrial practices. Use recognized indus-
Air intake restricted.
Check air intake and correct as required.
trial practices as the general guide for engine ser-
Replenish fuel supply with fresh, proper quality
Poor quality fuel.
vicing. Service information is provided in the manu-
fuel.
facturer's literature and appendixes B through G.
(2) Reference Literature. The engine user must
Clogged injector.
Clean all injectors, refer to appendix G.
refer to manufacturer's literature for specific infor-
Faulty throttle linkage
Check linkage and governor refer to manufac-
mation on individual units. For example, refer to
turer's instructions and correct as required.
or governor setting too
low.
table 3-5 for troubleshooting an engine that has
developed a problem.
Clean filters and screens.
Clogged filters and
screens.
Table 3-5. Diesel engines troubleshooting.
Reduce load to proper level.
Engine overloaded.
Schedule the overhaul and correct as required.
Engine due for over-
HARD STARTING OR FAILS TO START
haul.
Cause
Remedy
Perform timing procedure, refer to appendix G.
Incorrect timing. En-
Air intake restricted.
Check intake and correct as required.
gine requires tune-up.
Perform tune-up procedure, refer to appendix
Fuel shut-off closed,
Make sure shut-off is open and supply is at
G.
low supply of fuel.
proper level.
DOES NOT REACH GOVERNED SPEED
Poor quality fuel.
Replenish fuel supply with fresh, proper quality
The same causes for
The same remedies for "low power", apply.
fuel.
"low power", apply.
Clogged injector.
Clean all injectors, refer to appendix G.
EXCESSIVE FUEL CONSUMPTION
Injector inlet or drain
Check all connections and correct as required.
connection loose. En-
Schedule the overhaul and correct as required.
Check air intake and correct as required.
Air intake restricted.
gine due for overhaul.
Check exhaust system and turbocharger; correct
High exhaust back
as required.
Incorrect timing.
Perform timing procedure, refer to appendix G.
pressure.
Poor quality fuel.
Replenish fuel supply with fresh. proper quality
ENGINE MISSES DURING OPERATION
fuel.
Air leaks in fuel suc-
Check fuel suction lines and correct as re-
tion lines.
quired.
Clean all injectors, refer to appendix G.
Faulty injector.
Engine overloaded.
Restricted fuel lines.
Check fuel lines and correct as required.
Reduce load to proper level.
Engine due for over-
Refer to manufacturer's instructions and correct
Leakage at engine
Schedule the overhaul and correct as required.
valves.
as required.
haul.
Perform timing procedure, refer to appendix G.
Incorrect timing.
Perform timing procedure, refer to Appendix G.
Incorrect timing.
EXCESSIVE SMOKING AT IDLE
ENGINE QUITS
Restricted fuel lines.
Check fuel lines and correct as required.
Check air intake and correct as required.
Air intake restricted.
3-23
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