Table 4-3. Organizational Troubleshooting-Continued
TEST OR INSPECTION
4. ENGINE SHUTS DOWN AND WILL NOT RESTART-continued
If OVERSPEED indicator lamp is lit, check for 24V DC across emergency stop relay K21 (part of AC-DC
control relay assembly, 18, figure 4-19).
If 24V,DC is present, proceed to next step. If voltage is absent, K21 may be defective and must
be referred to next higher level of maintenance.
Use a multimeter to check for 24V DC across speed switch SS3 (see figures 4-40 and 4-42).
To check this component refer to FO-3 to determine where these points are electrically accessible
to meter probes.
If 24V DC is absent, SS3 or its shutdown relay K31 (part of annunciator control assembly, 76,
figure 4-20) may be defective and must be referred to next higher level of maintenance.
5. ENGINE RUNS ERRATICALLY OR MISFIRES.
Refer to paragraph 4-50, and check fuel lines into and out of the fuel injection pump for damage or
If fuel lines are defective, refer to paragraph 4-50 for replacement procedures.
If fuel lines are free of obstruction or defect, refer malfunction to next higher level of maintenance.
Check the air intake system (see figure 4-23), especially air valves (27), air cleaners (29), service indicator
(28), hoses (25), and adapters (26). Inspect turbochargers (see paragraph 4-78) and intercoolers (see
Clear any blockages, or service air intake system components as necessary (see paragraphs 4-42,
4-43, and 4-44). Clear obstructions in turbochargers or intercoolers, or replace if defective (see
paragraphs 4-78 and 4-84).
If air intake system appears to be working properly, refer to next higher level of maintenance.
If feasible, temporarily disconnect the generator load by