TM-9-2815-220-24
AVDS-1790 2CA, 2DA and 2DR Air-Cooled 12-Cylinder Diesel Engines
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL FOR AVDS-1790 2CA, 2DA and 2DR Air-Cooled 12-Cylinder Diesel Engines
TM-9-2815-220-24 - 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
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