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 131 of 1563

TM 9-2815-220-24

COOLING SYSTEM DEFICIENCIES

0017 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.

MALFUNCTION 1:

Engine overheating (evidenced by high oil temperature, low oil pressure, and warning lights

"ON").

PROBABLE CAUSE

CORRECTIVE ACTION

a. Oil cooler screens and fins blocked with

debris.

(1) Clean screens and oil cooler finned air

passages.

NOTE

Inspect for oil leaks and

avoid oil spillage.

b. Restricted cooling air inlets (blocked with

debris).

(1) Clean air inlets and grilles.

c. Oil level overfull.

(1) Refer to WP 0031, Engine Oil Replacement.

d. Seasonal grade of oil improper (too heavy)

for ambient temperature.

(1) Check oil in engine.

Drain and refill with

proper grade of oil (refer to pertinent

Vehicle Lubrication Order).

e. Cooling fan clutch slipping, fan drive failed,

or blades eroded.

(1) Check fan rotation and clutch torque

(WP 0045, Cooling Fan Clutch Slip Test).

Inspect fan blades (WP 0053, Cooling Fan

Inspection).

Repair as required.

f.

Cooling shroud, baffle, deflector or plates

loose, cracked or broken.

(1) Inspect and repair as required.

g. Oil cooler thermostatic valve and/or bypass

valve defective.

(1) Remove valves and replace.

Go to

WP 0072, Oil Cooler Replacement (Engine

and Transmission).

h. Engine over-powered due to improper fuel

adjustment.

(1) Replace fuel injection pump (WP 0115,

Fuel Injection Pump Assembly

Replacement).

WP 0017 00-1