TM-9-2815-220-34 Direct Support Manual for AVDS-1790-2C and AVDS-1790-2D Engines Download

Malfunction Abno131 Oil Conditions - Continued 13.G Oil diluted with fuel: (Evidenced by rising oil level, thin oil con- sistency) l3.7 xccssive oil consumption: (150: I (max.) fueVoil ratio (in gallons)) 13.8 Excessive crankcase blow-by: (high crankcase pressure) 13.9 Generator oil pressure abnormal: (AVDS-1790-2C only). 14. Fuel System Abnormal Conditions 14.1 Air In system: TM 9-2815-220-34 Table fl.fl. Troubleshooting Pocedures - Continued Probable cause a. Engine operating at idle for extended periods during cold weather. b. Fuel leakage at fuel injector nozzle body. c. Engine fuel supply pump shnft eal leak. d. [njection p11mp inteal fuel leak into oil. a. Loss of oil due to leaks. b. Oil level overfull. c. Seasonal grade of oil improper (oil tov light) for ambient temperature. d. Piston ngs or valve guides wo (result of dust ingestion). e. Piston rings damaged: (scuffed due to engine overheating). f. 1\1rbocharger defective (worn or damaged seals). a. Heavy carbon deposits ii. brt>ather tube at turbocharger exhaust pipe. b. Ring;1 wo or damaged. a. Restricted oil lines. b. Failed generator dve gear assembly (coupling assembly). c Generator oil pump failure. d. Occurred during fuel filler replace· ment, engine or power pack installa- tion or long period shutdown. b. Return fuel restction Corrective action al. Drain oil and refill with proper oil. Refer to lub1ication order. a2. A void operating at idle for ex tended periods during cold weather. bl. Locale faulty nozzle. Refer to DT 2.3. b2. Repair or replace nozzle and holder assembly (para 2-48). c. Repair or replace pump assembly (pnrn 2-17 or 2-J7.l). d. • Rcpln..:c injection pum1> (pnra 2-21). n. Inspect ent,ne for oi I leaks. Repair as required. b. Refer to item 13.5. c. Refer to item 13.l. b. di. Inspect induction system for dust entry (air cleaner seals, hoses and clamps). Repair or replace. Refer to pertinent \•chicle technical manual. d2. Verify cylinder compression.Refer to DT-9. d3. •If compression test indicates engine I damage, reir or replace cylinder and rings as required. e I. Refer to item J 2. e2. Verify cylinder compression. Refer toDT-9. e3. 'If compression test indicates engine damnge, repair or replace defective parts as required. f. Remove inlet and exhaust elbows nnd check for evidence of oil. Replace defective turbocharger (para 2-20 or 2-20. 1) al. Refer lo DT-11. a2. Clean engine crnnkcase breather tube. b. Refer lo item 13.7,d. a.• Inspect lines for plugging or damag. b. Refer toDT-13.5. Replace drive gear assembly (para 3-51). cl. Refer to DT-10.2. c2. •Replace pump or generator. al. "Purge" fuel system. Turn "ON" master, and in-tank fuel pump switches. Operate in-tank fuel pump for J or 2 minutes Simultaneously operate purge pump, completing 4 or 5 strokes after firm handle pressure is noted. CAUTION Do not depress flame heater button. a2. With in-tank pumps operating, open bleeder valves (on cover of both primary nnd fuel water separator fillers) until all fuel (no air) is noted. b. Refer lo item 14.11. Change 3 2-17