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 TM 9-2815-220-24
ENGINE ROUGH 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:
Engine misfires (more noticeable at idle operation).
PROBABLE CAUSE
CORRECTIVE ACTION
a. Water contaminated fuel.
(1) Check fuel for water (WP 0020, Fuel
System Abnormal Conditions).
b. Engine operating at idle for extended period
(1) Increase engine idle speed to 1000 - 1200
during cold weather.
rpm.
c. Fuel leak, nozzle high-pressure tube.
(1) Inspect for leak (WP 0020, Fuel System
Abnormal Conditions).
d. Fuel injector nozzle defective.
(1) Refer to WP 0114, Fuel Injector Nozzle
Replace/Repair.
e. No valve rocker clearance.
(1) Locate faulty cylinder as follows:
PROCEDURE
OBSERVATION
ANALYSIS
Audible Check:
Open grilles, remove top deck, engine shroud, and covers for access
to cylinders.
Operate engine at idle.
Listen or use sounding rod to determine
Location of noise
noisy cylinder.
isolates faulty cylinder.
WP 0014 00-1
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