11-6
TABLE 11-1. TROUBLESHOOTING GENSET FAULTS (CONT.)
@@@@ Some genset service procedures present hazards that can result in severe personal
injury or death. Only trained and experienced service personnel with knowledge of fuels, electricity,
and machinery hazards should perform genset service. See Safety Precautions.
Accidental or remote starting can cause severe personal injury or death. Before removing a panel or
access door, disconnect the negative (–) cable from the battery to prevent the engine from starting.
WARNING
LOSS OF RAW WATER FLOW—CODE NO. 7
Control Logic:
Insufficient raw water flow through the heat exchanger to cool the engine
Corrective Action:
1. Open the sea valve.
2. Check for and clean a blocked sea water strainer. If above the water line, fill the strainer with water to
assist priming.
3. Check for and reconnect or replace any disconnected, kinked or leaking raw water hoses.
4. Check for and readjust a loose pump belt (p. 4-9).
5. Check for a worn raw water impeller and replace as necessary (p. 4-10).
6. Check the bottom of the hull for any blockage at the through-hull fitting.
7. Disconnect connector
P1
(black) from the genset controller (p. 9-1) and check continuity between Pin
8
and
B–
(ground). If open, check for a missing, bent or corroded pin, faulty wiring or open raw water flow
switch
S6
(p. 9-7). Repair as necessary.
HIGH AC VOLTAGE—CODE NO. 12
Control Logic:
After voltage regulation was enabled Output Voltage jumped to more than 125percent of
rated for 75 milliseconds or to more than 115percent of rated for 3 seconds
Corrective Action:
1. Push the genset line circuit breaker
OFF
, start the genset. If output voltage is normal, the problem is
in the circuits external to the genset.
2. Check all fuel filters and fittings for fuel and air leaks, tighten as necessary and reprime. (Air bubbles
can disrupt frequency.)
3. Check the brushes and slip rings (p. 8-4) and rotor and stator windings (p. 8-5) and service as neces-
sary.
4. Replace the genset controller (p. 9-1).
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Summary of Contents for MDKBH Series
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