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 TM 9-2815-220-24
ENGINE NOISY OPERATION
THIS WORK PACKAGE COVERS:
Troubleshooting Table and Diagnostic Tests
INITIAL SETUP:
Tools:
Personnel Required
General mechanic's tool kit (item 121, WP 0176)
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
(1) Locate faulty cylinder as follows:
adjustment.
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
Location of noise
noisy cylinder.
isolates faulty cylinder.
Fuel "Shorting" Method:
Check all cylinders, one at a time.
Indicates faulty cylinder,
Note cylinder on which no change
Loosen fuel injector
defective nozzle, tight rocker
in engine operation occurs, knock
tube fitting at nozzle
arm, worn valve or
disappears or decreases, and/or
end sufficiently to
hydrostatically damaged
engine roughness or misfire still
allow fuel leakage.
connecting rod.
exists.
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.
Loosen fuel injector tube fitting High-pressure fuel spray
Fuel injection pump action is
at nozzle end sufficiently to
pulsations at nozzle fitting.
normal.
allow fuel leakage.
No fuel spray pulsations
Fuel injection pump
noted at nozzle fitting.
deficiency.
WP 0015 00-1
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