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

TM 9-2815-220-34 Tabft 2-2. oubftshooting edures -Continutd Mallunc1ion l ' t abltta UR Engine Fails To Start Al Normal Cranking Speed - Continued 3.2 Cylinders partially firg: (insufii· cient f ue l ) 4. Engine Low Idle Abnormal Opera- tion 4.1 Low-idle speed tꝏ low: (below ʊ rpm) 4.2 Low.idle speed erratic: (unsteady or surge) 4.3 Misfires at idle: (Usually accom· panied by white exhaust smoke, oily, or heavy carn depits on exhaust gr il les.) 5. Engine High-Idle (No-Load) Abnor- mal Operation 5 .1 High-id l e speed tꝏ low: (low 20 rpm) 5.2 High idle speed tꝏ high: (ave 0 rpm) I 6. Engine Ovepeeds 6.1 erspeeds during vehicle operation. d. !Aw cylinder compreion. e. Throttle linkage disconnected. r. Injection Pump or drive deficiency. a. Air in fuel system. b. Water contaminated fuel . c. Cylinder loo cold. Applies in colll weather. c. Induction air restricted or blocked. e. Low cylinder compression. f. Injection Pump liming improper. 8. Insufficient warm-up. Applies in cold weather. b. Lmproper idle adjustment. c. One bank nol firing. a. ldl speed tꝏ low b. Accelerator or throttle Ii nk8ge lꝏse, worn, or cross-shaft shk spring defective. c. One or re cylinders partially firing. (Water or air in fuel system). d. Injector noles defective. e. Fuel injection pump governor defective. f. Injection pump improperly timed. a. Engine operating at idle for extended peri during cold weather. a. Accelerator or throttle linkage deficien- cy. b. Low fuel pressure. (fuel filter reslric· lion) c. Fuel injection pump governor deftive. 8. oling fan malfunction. b. e l injection pump governor detective. a. Vehicle operating on stp down-grade. di. Check cylinder compression. Refer to DT9. . •Repair or rc1>lacc cylinder, piston, rings, and/or valves chapter 3. e. Check linkage (item 14.3, c.). f. Check for deficiencies (item 14.6.). a. Bleed and purge system. (item 14.1.) b. Check automatic drain system (Item 14.13.) c. Operate engine intake manifold healer to aist starling. Refer lo pertinent vehicle technical manuRI. d. Inspect, repair and replace as required. (item 11.1, a, , c and d.) c I. Check cylinder compreion. Refer lo DT9. e2. 'Repair or replace cylinder piston, rings, and/or ''alves chapter 3 f. Check timing (refer to para 2·21). a. Extend warm-up period. Increase warm . up spe'ed LO * • 140 rpm. b. Adjust idle speed (item 14.Sa) cl. Increase warm.up speed to 10. 140 rpm. If it dœs not fi, check injec- tion pump operation. Refer lo OT l.8. c2. •Replace injection pump if indicated by DT l.8. (para 2-21) a. Adjust idle speed. Refer to Item 14.3f. b. Inspect linkage. Refer lo 14.3, a. c. d. e. f. a. Refer to hems 14.1, and 14.2. Remove and check nozzles. Refer to Item 14.8. •Replace defective fuel injection pump (para 2-21). Check timing and inspect pump (para 2-21). Increase engine idle speed to 10 • 0 140 rpm. a. Inspect linkage. Refer lo Item 14.3. b. Check fille. llem 14.5 c. •Replace fuel injection pump (para 2-21). a. Check fans. Refer to (item 12.1, e.) b. •Replace fuel injection pump (para 2·21). a. Apply vehicle brakes to avoid over- speed. 2-13