TM-9-2815-220-24 Maintenance Manual for AVDS-1790-2CA AVDS-1790-DA and AVDS-1790-2DR Engines Download
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TM 9-2815-220-24 ENGINE FAILS TO START AT NORMAL CRANKING SPEED 0008 00 MALFUNCTION 1: (Continued) Cylinders not firing (insufficient fuel or incomplete combustion). PROCEDURE OBSERVATION ANALYSIS If fuel flow stops, solenoid valve is closing properly. (Continued) Solenoid Valve and Fuel Filter With switch in "OFF" position note that fuel flow stops. If fuel flow continues, solenoid valve is defective (stuck open). Fine fuel spray pattern indicates proper nozzle operation. Fuel Nozzle Assembly: Disconnect lines and remove nozzle assembly. Reconnect lines to nozzle, (position nozzle beside housing) and operate heater system. With switch in "ON" position, nozzle should have fine conical fuel spray pattern. No spray pattern, stream of fuel, dribble, or no fuel indicates defective nozzle or plugged felt port filters in nozzle assembly. Moderate flow indicates solenoid valve is operating properly and check valve is opening properly. With switch in "ON" position, note fuel flow from check valve opening. No fuel or restricted flow indicates check valve stuck closed or felt filters in solenoid valve are restricted or clogged. If fuel flow stops, solenoid valve is closing properly. Return Fuel Solenoid Valve and Check Valve: Remove fuel return solenoid outlet tube after the check valve at rear of engine, operate purge pump and press heater switch "ON" and "OFF". With switch in "OFF" position, note that fuel flow stops. If fuel flow continues, solenoid valve is defective (stuck in open position). PROBABLE CAUSE CORRECTIVE ACTION d. Low cylinder compression. (1) Check cylinder compression (WP 0033, Cylinder Compression Test). e. Throttle linkage disconnected. (1) Check linkage (WP 0122, Injection Pump Throttle Linkage and Associated Parts Repair). (WP 0123 for 2DR) f. Injection pump or drive deficiency. (1) Check for deficiencies (WP 0020, Fuel System Abnormal Conditions, Malfunction 6). WP 0008 00-4