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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 PERFORMANCE LOW 0019 00 WP 0019 00-2 POWER VERIFICATION: Perform engine "stall" test as follows: (Continued) PROCEDURE OBSERVATION ANALYSIS Engine speed 1800-1950 rpm. Engine power is normal. Engine speed below 1800 rpm. Power is below normal. Repeat the preceding step, but operate engine for 30 seconds. Engine speed above 1950 rpm. Transmission is slipping or fuel injection pump is out of adjustment. PROBABLE CAUSE CORRECTIVE ACTION (1) Investigate transmission clutches, brakes, and vehicle suspension for being too tight. Repair as required (refer to pertinent vehicle technical manual). a. If stall speed is normal (1800-1950 rpm), low performance is vehicle related or vehicle may be operating under severe conditions. (2) Check vehicle performance on hard road; and if performance is satisfactory, limit vehicle operation under severe conditions to short periods of operation. Possible engine damage may be prevented. (1) Investigate for transmission slippage (refer to vehicle technical manual). b. If stall speed is above normal (more than 1950 rpm) low performance is transmission related and engine is over-powered. (2) Replace fuel injection pump (WP 0115, Fuel Injection Pump Assembly Replacement). MALFUNCTION 1: Low stall with both banks firing and normal smoke. PROBABLE CAUSE CORRECTIVE ACTION a. In-tank fuel pump inoperative. (1) Check in-tank fuel pump operation (refer to pertinent vehicle manual). Repair as required. b. Throttle travel limited. (1) Inspect accelerator and throttle linkages (WP 0122, Throttle Control and Manual Fuel Shutoff Replace/Repair). (WP 0123 for 2DR) c. Water contaminated fuel or improper fuel. (1) Check fuel system for water content (WP 0020, Fuel System Abnormal Conditions). Service as required (refer to pertinent vehicle technical manual for proper fuel specification). d. Fuel filter restriction (dirty). (1) Inspect fuel filters (refer to pertinent vehicle technical manual). Service filters as required.