TM 9-6115-730-24
0011
TROUBLESHOOTING FAILURES WITHOUT FAULT CODES - Continued
WARNING
Cooling system operates at high temperature and pressure. Contact with high pressure steam
and/or liquids can result in burns and scalding. Shut down generator set, and allow system to cool
before performing checks, services, and maintenance. Failure to comply can cause injury or
death to personnel.
When running, generator set engine has hot metal surfaces that will burn flesh on contact. Shut
down generator set, and allow engine to cool before performing checks, services, and
maintenance. Wear gloves and additional protective clothing as required. Failure to comply can
cause injury or death to personnel.
SYMPTOM
21.
Engine Misfires, Runs Rough, or is Unstable.
MALFUNCTION
Fuel Supply Problem.
CORRECTIVE ACTION
STEP 1.
On EMCP set ENGINE CONTROL switch to OFF/RESET. Set Battery
Disconnect Switch to OFF. Set DEAD CRANK SWITCH to OFF.
STEP 2.
Verify fuel quality. If fuel is not clean or if signs of wax are present, drain and
replace fuel TM 9-6115-730-10.
STEP 3.
Check for a fuel supply problem and verify fuel pressure (WP 0013,
SYMPTOM 10).
STEP 4.
If no fuel supply problem is found, engine has an internal problem. Replace the
engine (WP 0096).
STEP 5.
Verify the problem has been resolved.
MALFUNCTION
Electrical Connections Faulty.
CORRECTIVE ACTION
STEP 1.
Set Battery Disconnect Switch to ON. Set DEAD CRANK SWITCH to NORMAL.
Turn the ENGINE CONTROL switch to COOL DOWN/STOP.
STEP 2.
Check DC voltage at slave relay (SRY) pin 87 (+) with respect to 86 (-) (FO-2,
sheet 2).
a.
If voltage is not 24 Vdc, Measure voltage at SRY pin 30 (+) with respect
to 86 (-).
b.
If voltage is 24 Vdc, measure SRY pin 85 (+) with respect to 86 (-).
c.
If voltage is 24 Vdc, replace SRY (WP 0042).
d.
If voltage is not 24 Vdc, replace GSC (WP 0041).
e.
If voltage at SRY pin 30 is not 24 Vdc, measure voltage across CB-4.
0011-25
