TM-9-2815-220-24 Maintenance Manual for AVDS-1790-2CA AVDS-1790-DA and AVDS-1790-2DR Engines Download
Page 123 of 1563
TM 9-2815-220-24 ENGINE NOISY OPERATION 0015 00 THIS WORK PACKAGE COVERS: Troubleshooting Table and Diagnostic Tests INITIAL SETUP: Tools: General mechanic’s tool kit (item 121, WP 0176) Personnel Required Track Vehicle Repairer (2) 63H10 Equipment Conditions: Engine installed in vehicle or ground hop. MALFUNCTION 1: Knock or tapping sound. PROBABLE CAUSE CORRECTIVE ACTION a. Rocker arm assembly defective or out of adjustment. (1) Locate faulty cylinder as follows: PROCEDURE OBSERVATION ANALYSIS Audible Check: Open grilles, remove top deck, engine shroud, and covers for access to cylinders (WP 0090, Oil Cooler Access Covers and Frames Replacement (Engine and Transmission). Operate engine at idle. Listen or use sounding rod to determine noisy cylinder. Location of noise isolates faulty cylinder. Fuel "Shorting" Method: Check all cylinders, one at a time. Loosen fuel injector tube fitting at nozzle end sufficiently to allow fuel leakage. Note cylinder on which no change in engine operation occurs, knock disappears or decreases, and/or engine roughness or misfire still exists. Indicates faulty cylinder, defective nozzle, tight rocker arm, worn valve or hydrostatically damaged connecting rod. High Pressure Fuel Check: Remove one engine cover on each side of engine for access to fuel injector nozzle tube fittings. Crank engine with fuel switch "ON" or start engine and operate at idle speed. High-pressure fuel spray pulsations at nozzle fitting. Fuel injection pump action is normal. Loosen fuel injector tube fitting at nozzle end sufficiently to allow fuel leakage. No fuel spray pulsations noted at nozzle fitting. Fuel injection pump deficiency. WP 0015 00-1