Quantcast ENGINE HIGH IDLE (NO LOAD) ABNORMAL OPERATION

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TM 9-2815-220-24
ENGINE HIGH IDLE (NO LOAD) 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:
High idle speed too low (below 2500 rpm).
PROBABLE CAUSE
CORRECTIVE ACTION
a. Accelerator or throttle linkage deficiency.
(1) Inspect linkage (WP 0122, Throttle Control
and Manual Fuel Shutoff Replace/Repair).
(WP 0123 for 2DR)
b. Low fuel pressure (fuel filter restriction).
(1) Check filters (WP 0020, Fuel System
Abnormal Conditions).
c. Fuel injection pump governor defective.
(1) Replace fuel injection pump (WP 0115,
Fuel Injection Pump Assembly
Replacement).
MALFUNCTION 2:
High idle speed too high: (above 2640 rpm).
PROBABLE CAUSE
CORRECTIVE ACTION
a. Cooling fan malfunction.
(1) Check fans (WP 0053, Cooling Fan
Inspection).
(2) Check fan clutch (WP 0129, Fan Drive
Clutch Assembly and Associated Parts
Replace/Repair).
b. Fuel injection pump governor defective.
(1) Replace fuel injection pump (WP 0115,
Fuel Injection Pump Assembly
Replacement).
END OF WORK PACKAGE
WP 0010 00-1 (2 blank)

 


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