TM 10-4320-307-24
Table 2-3.
Unit Maintenance Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2.
ENGINE CRANKS BUT FAILS TO START
Step 1.
Check air cleaner intake restriction indicator for red band indicating blocked air cleaner elements.
If red band appears in air cleaner restriction indicator and rain cap is not blocked and no damage to
system components is found, replace primary and secondary elements (para 2-38).
Step 2.
Be sure that fuel tank vent is not clogged or restricted. A closed vent will cause a vacuum in the fuel
tank and not allow fuel to flow freely to the fuel feed pump.
If vent is clogged, dislodge debris being careful not to contaminate the fuel.
Step 3.
Check alinement of 3-way selector valve.
Aline 3-way selector valve to open position (refer to TM 10-4320-307-10).
Step 4.
Check for empty fuel tank.
If fuel tank is empty, fill with diesel fuel oil and bleed air from fuel system.
Step 5.
Check fuel supply to injectors.
If there is no fuel flow, replace fuel filter as described in paragraph 2-51.
Step 6.
Check air inlet and turbocharger for obstructions, carbon or dirt buildup on turbocharger impellers, or oil
leaks.
Notify direct support maintenance.
Step 7.
During cold weather operations check cold starting aid.
Replace ether bottle (para 2-37).
3.
ENGINE RUNS UNSTEADILY AND POWER OUTPUT IS LOW
Step 1.
Check air cleaner intake restriction indicator for red band indicating blocked air cleaner elements.
If red band appears in air cleaner restriction indicator and rain cap is not blocked and no damage to
system components is found, replace primary and secondary elements (para 2-38).
Step 2.
Be sure that fuel tank vent is not clogged or restricted. A closed vent will cause a vacuum in the fuel
tank and not allow fuel to flow freely to the fuel feed pump.
If vent is clogged, dislodge debris being careful not to contaminate the fuel.
Step 3.
Check fuel supply to injectors.
If there is no fuel flow, replace fuel filter as described in paragraph 2-51.
Step 4.
Check air inlet and turbocharger for obstructions, carbon or dirt buildup on turbocharger impellers, or oil
leaks.
Notify direct support maintenance.
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