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

Tobit 2·3. Ditic Ttau - Continutd Prurt allon Vhicle In-Tank FuI Pump eration - Continued  6.3 Pump Output: (uel Flow Capacity)   OT    I. Open lefl grille dꝏrs. Disconnect fuel tank supply he quick dis- connect coupling valve at engine. 2. Open coupti ng vaIve (hold open) to collect fuel in suitable con- tainer (S gallon) . 3. 'furn master and in-tank fuel pump switches "ON".  Time fuel now into measured con- tainer. 7 Vehicle Air Cleaner Tests 7.1 Preleaner Blower: l. St�rt engine and operate at idle. 7.2 Air Cleane: 1. Perform" stall" test (Refer to  15.2) CAUTION  not perform under dusty conditions. 2. Open doors, remove elements, clean element chamber and cle dꝏrs. Repeat · stall test. 8. Cylinder Fault Ilation Test 8.1 Audible Check: I. Open illes, remove top deck, engine shroud and covers for ac· cess to cylinde. 2. Operate engine at idle. 8.2 Fuel "Shorting" Meth: 1. Perform Test OT 1.8 2. Check all cylinders, one at a ti me.  �.3 Cylinder Compression Method: 1. Perform Test  9  9. · Cylin r mprsion Test  9.1 Compreion Test: 1. Remove top dk, enine shroud and cove for aess lo fuel in· jlor nles 2 Start and warm up engine to operating temper�ture (14F.) 3. Stop engine and remove injccLor noules from all cylinde. 4. Hold fuel shutff (engine "stop") switch and crank engine several revolutions to expel fluids from cylinde a. 3 gpm fuel now. b. Fuel now below 3 gpm. a. Note blast of air (on hand) from pre- cleaner air exhaust outlets, two on each air cleaner. b. No air blast. a. Normal speed (1P0 · 192 rpm) b. Speed below normal. a. H engine speed increases from speed ob- tained in 1, b to normal speed (1P0·192 rpm}. a. Listen or use sounding r to determine noisy cylinder. a. Note cylinder on which no change in engine operation cu, knk dip- pears or decreases, and/or engine roughness or misfire still exists. a. Note cylinder with low pressure. (Below Ŋ psi at 140-1P cranking m). TM 9-2815-220-34 Aulpl1 a. Pump output i s sa ti sfactory. b. Pump output low normal. a. Blt of air Indicates blower(s) is operating. b. Blowes) is inoperative. a. Air cleaner elements satisfactory. b. Preed to 2 low. a. The elements are dirty. a. Location of noise isolates faulty cylinder. a. Indicates faulty cylinder. fective noule, tight rker arm, worn valve or hydrlatically damaged nnect- ing r. a. Indicat faulty cylinder. Damaged rings, piston, valve, connting  or tight rocker arm. No valve clearan. %-27