Quantcast MALFUNCTION 1: Engine misfires (more noticeable at idle operation)-(Continued) - TM-9-2815-220-240120

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TM 9-2815-220-24
ENGINE ROUGH OPERATION
0014 00
MALFUNCTION 1: (Continued)
Engine misfires (more noticeable at idle operation).
PROBABLE CAUSE
CORRECTIVE ACTION
e. (Continued) No valve rocker clearance.
(1) Locate faulty cylinder as follows:
PROCEDURE
OBSERVATION
ANALYSIS
Fuel "Shorting" Method:
Check all cylinders, one at a time.
Indicates faulty cylinder,
Note cylinder on which no
Loosen fuel injector
defective nozzle, tight rocker arm,
change in engine operation
tube fitting at nozzle
worn valve or hydrostatically
occurs, knock disappears or
end sufficiently to
damaged connecting rod.
decreases, and/or engine
allow fuel leakage.
roughness or misfire still exists.
High Pressure Fuel Check:
Remove one engine cover on each side of engine for access
to fuel injector nozzle tube fittings.
Crank engine with fuel switch "ON" or start engine and
operate at idle speed.
Loosen fuel injector
High-pressure fuel spray
Fuel injection pump action is
tube fitting at nozzle
pulsations at nozzle fitting.
normal.
end sufficiently to allow
No fuel spray pulsations noted
Fuel injection pump deficiency.
fuel leakage.
at nozzle fitting.
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
e. (Continued) No valve rocker clearance.
(2) Adjust valve to proper clearance
(WP 0034, Intake and Exhaust Valve
Clearance Adjustment).
f. Intake or exhaust valve failure (burned,
(1) Locate faulty cylinder as above.
worn or damaged).
(2) Inspect, repair or replace valve and/or
cylinder (WP 0133, Cylinder Assembly
Replacement).
WP 0014 00-2

 


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