11-9
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
LOW AC FREQUENCY—CODE NO. 15
Control Logic:
During normal operation Frequency fell to less than 90percent of nominal for more than
8 seconds
Corrective Action:
1. Push the genset line circuit breaker OFF. If the genset now runs, reduce the number of loads, especially
those with high motor starting loads such as air conditioners.
2. Check the fuel tank and fill as necessary. (Note: The arrangement of pickup tubes in the fuel supply tank
probably is such that the genset will run out of fuel before the propulsion engines.)
3. Remove combustion air or exhaust system blockages.
4. Prime the engine fuel system for at least 30 seconds (p. 3-3).
5. Check all fuel filters and fittings for fuel and air leaks, tighten as necessary and reprime. (Air bubbles
can disrupt frequency.)
6. Replace the fuel filters and reprime (p. 4-5).
7. Conduct a fuel pump test and replace if necessary (p. 6-4).
8. Check for proper operation of the governor actuator and service as necessary (p. 6-7).
9. Readjust high idle speed (p. 6-10).
10. Service the fuel injectors in accordance with the engine Workshop Manual (p. 6-1).
11. Check fuel injection timing in accordance with the engine Workshop Manual (p. 6-1).
12. Check for proper operation of the internal governor mechanism in accordance with the engine Work-
shop Manual (p. 6-1).
13. Service a worn engine in accordance with the engine Workshop Manual (p. 6-1).
14. Replace the genset controller (p. 9-1).
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Summary of Contents for MDKBH Series
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