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 119 of 1563

TM 9-2815-220-24

ENGINE ROUGH OPERATION

0014 00

THIS WORK PACKAGE COVERS:

WP 0014 00-1

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:

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

during cold weather.

(1) Increase engine idle speed to 1000 - 1200

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

noisy cylinder.

Location of noise

isolates faulty cylinder.