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