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 126 of 1563

TM 9-2815-220-24

ENGINE NOISY OPERATION

0015 00

MALFUNCTION 2: (Continued)

Diesel knock ("ping," usually at low-idle speed).

PROBABLE CAUSE

CORRECTIVE ACTION

b. Return fuel line disconnected or restricted.

(1) Inspect fuel line (WP 0080, Fuel Injection

Nozzle Return Hoses and Related Parts

Replacement).

c. Engine fuel-injection pump.

(1) Check timing (WP 0036, Injection Pump

Timing).

MALFUNCTION 3:

Grinding or squeaking sound.

PROBABLE CAUSE

CORRECTIVE ACTION

a. Cooling fan interference (fan housing vane

or foreign material).

(1) Inspect fan for proper clearance (WP 0053,

Cooling Fan Inspection). Repair or replace

damaged parts.

b. Engine accessories.

(1) Replace damaged accessory.

c. Worn or damaged gears, camshaft, rocker

arm bearing or bushings.

(1) Check for damage (WP 0178, Disassembly/

Assembly Procedure Sequence for the

AVDS 1790-2 Engine).

END OF WORK PACKAGE

WP 0015 00-4