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

Fuel Preure Tests - ntinued  1.8 Primary Fuel Filler Test: 1. Repeat OT 1.1, l through 3. !' 1.4 Secondary Fuel/Waler parator Filler Test: 1. Repeat  1.1, I through 3.  1.4 condary Fuel/Waler parator Filter Test: 1. Repeat  1.1, I through 3. 01' 1.5 In.tank Fuel Pump (s) Malfunc· lion Test: 1. Repeat  1.1, 1 and 2.  1.6 Fuel Pressure Regulating (Fuel Return) Valve Test: 1. Repeat  1.1, 1 through S.  1.7 Engine Fuel Supply Pump: 1. Repeal OT 1.1, l through 8.  1.8 l. 2. 3.  2  2 1. 2.  2.2 1. 2  2.3 1. High Pressure el Check: emove one engine cover on each side of engine for aess lo fuel injector noule  fittings. Crank engine with fuel s+tch "ON", or start engine and oper· ale al idle speed. on fuel injector tube fitting at noule end sufficiently lo +llow fuel leakage (one noule on each side of the engine). Fuel Injector Noule Tests Nle Malfunction: Perform test  1.8, one cylinder at a time with engine idling (all engine coe removed). •Alternale check with power pack removed. Operate engine at idle speed. nch tesl Install nzle and holder assembly on tester. Perform nle test. (refer to para ø). Nzle  in Cylinder Operate engine at idle speed. Tobie 2·3. Di1ostic Test - Continued a. 40 psi al fuel/water separator filter, and low 1 psi al primary fuel filler. a. ( psi at fuel/water parator filter, and low I psi al primary fuel filter. a. low 40 psi at fuel/water separator (ilter and 1-3 psi al primnry fuel filler. a. 5.7 psi al fuelfwaler separator filter, and 5.7 psi at primary fuel ter. b. Below 5 psi at fuel/water separator filter, and low 5 psi at primary fuel filter. a. ( psi at fuel/water parator filter, and 1-3 psi at primary fuel filter. b. Below 40 psi at fuel/water separator filter, and l psi al primary fuel filler. a. ( psi at fuelaler separator filter, and 1-3 psi at primary filter. b. Below 40 psi at fuelaler separator filter, and 1-3 psi al primary fuel filter. a. High pressure fuel spray pulsations al noule fitting. b. No fuel spray pulsations noted al noule fitting. a .. Note cylinder on which no change in engine operation curs, or if cylinder misfire still exists. a. Note jf cylinder temperature is cold (by touch) at intake port area of cylinder head. a. Spray pattern and nle leakage test re· quirements. a. Note any movement (jumping) of noule in cylinder head (visually or by touch). TM 9-2815·220·34 Analysi1 a. Primary filter restriction. Element dir· ty or cloed. a. Primary filter restriction. Element dir· ly or cloed. a. Fuel/water separator filter restriction. Coalescer elements dirty or clged. a. Jn.tank pump (s) operation normal. b Jn.tank pump (s) malCunction. reens cloe or pump (s) defective. a. Valve functioning properly. b. Valve malfunction. Valve stuck or spring defective. a. Pump operation normal. b. Pump malfunction. Regulator Valve or 8. b. 8. a. a. a. pump deftive. Fuel injection pump action is normal. Fuel injection pump deficiency. NOTE Test all fuel injector nozles for proper operation after a fuel injection pump failure (refer to D 2.2.) Cylinder is not firing due to defect'e noule. A cold cylinder indicates the cylinder is nol firing due to defective nle. U spray pattern is not acceptable and leakage is noted, nozzle is defective. Movement indicat ·le noule cap nul in dy, or collapsed nozzle holder spring. Nozzle is defective. 2-25