Quantcast MALFUNCTION 1: Knock or tapping sound-(Continued)

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TM 9-2815-220-24
ENGINE NOISY OPERATION
0015 00
MALFUNCTION 1: (Continued)
Knock or tapping sound.
PROBABLE CAUSE
CORRECTIVE ACTION
a. (Continued) Rocker arm assembly
(1) (Continued) Locate faulty cylinder as
defective or out of adjustment.
follows:
PROCEDURE
OBSERVATION
ANALYSIS
Cylinder Compression Test Method:
Note cylinder with low pressure  Indicates faulty cylinder,
Perform Cylinder
damaged rings, piston, valve,
(below 330 psi at 140-180
Compression Test
connecting rod or tight rocker arm
cranking rpm).
(WP 0033, Cylinder
(no valve clearance).
Compression Test).
PROBABLE CAUSE
CORRECTIVE ACTION
b. Excessive intake or exhaust valve clearance  (1) Locate faulty cylinder as above.
or damage.
(2) Adjust valve clearance (WP 0034, Intake
and Exhaust Valve Clearance Adjustment).
c. Rocker arm assembly defective.
(1) Inspect, repair, or replace valve and/or
cylinder (WP 0133, Cylinder Assembly
Replacement).
(2) Replace rocker arm (WP 0104, Rocker Arm
Assembly and Cover Replacement).
d. Connecting rod, piston, ring damage, or
(1) Locate faulty cylinder as above.
loose piston pin.
(2) Check for damage (WP 0143, Connecting
Rod Assembly and Associated Parts Repair
and WP 0142, Pistons, Rings, and
Associated Parts Replace/Repair).
e. Crankshaft bearing damage.
(1) Check for damage (WP 0138, Crankshaft
Main Bearing Inspection).
f. Worn or damaged gears or bearings.
(1) Check for damage (WP 0178, Disassembly/
Assembly Procedure Sequence for the
AVDS 1790-2 Engine).
WP 0015 00-2

 


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