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 111 of 1563

TM 9-2815-220-24

ENGINE HIGH IDLE (NO LOAD) ABNORMAL OPERATION

0010 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:

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)