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 127 of 1563

TM 9-2815-220-24

ENGINE ABNORMAL EXHAUST

0016 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:

Excessive black smoke (one or both banks).

PROBABLE CAUSE

CORRECTIVE ACTION

a. Induction air inlets blocked with debris.

(1) Inspect and clean air inlet grilles and air

cleaner inlets.

b. Air cleaner restriction (element dirty, wet,

or blower motor inoperative).

(1) Check restriction as follows:

PROCEDURE

OBSERVATION

ANALYSIS

Pre-cleaner Blower:

Note blast of air (on hand) from pre-

cleaner air exhaust outlets, two on each air

cleaner.

Blast of air indicates

blower(s) is operating.

Start engine and

operate at idle.

No air blast.

Blower(s) is

inoperative.

Air Cleaners

Perform "stall" test as

follows.

Start engine and warm

to normal operating

temperature (140

°

F).

With vehicle brakes

applied and

transmission in "high

range", depress

accelerator pedal fully

and operate engine for

20 seconds (max.);

release accelerator

pedal and allow engine

to idle 1 minute.

Engine speed below 1800 rpm.

Engine and

transmission partially

warmed up (not to

normal operating

temperature of 140ºF).

WP 0016 00-1