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 TM 9-2815-220-24
ENGINE LOW IDLE ABNORMAL 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:
Low idle speed, below 650 rpm.
PROBABLE CAUSE
CORRECTIVE ACTION
a. Insufficient warm-up. Applies in cold
(1) Extend warm-up period. Increase warm-up
weather.
speed to 1000 - 1200 rpm.
b. Improper idle adjustment.
(1) Adjust idle speed (WP 0043, Throttle
Adjustments).
c. One bank not firing.
(1) Increase warm-up speed to 1000 - 1200
rpm. If bank still does not fire, check fuel-
injection pump operation as follows:
PROCEDURE
OBSERVATION
ANALYSIS
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
at nozzle end sufficiently to
pulsations at nozzle fitting.
is normal.
allow fuel leakage (one nozzle
No fuel spray pulsations
Fuel injection pump
on each side of the engine.
noted at nozzle fitting.
deficiency. Replace fuel-
injection pump (WP 0115,
Fuel Injection Pump
Assembly Replacement).
Bench Test
Install nozzle and holder
assembly on tester.
Spray pattern and nozzle
If spray pattern is not
Perform nozzle test (WP 0098,
leakage test requirements.
acceptable and leakage is
Fuel Injector Nozzle and Holder
noted, nozzle is defective.
Repair).
WP 0009 00-1
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