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 TM 9-2815-220-24
ENGINE NOISY OPERATION
0015 00
MALFUNCTION 2:
Diesel knock ("ping," usually at low-idle speed).
PROBABLE CAUSE
CORRECTIVE ACTION
a. Manifold heater solenoid valves defective.
(1) Check solenoid operation as follows:
PROCEDURE
OBSERVATION
ANALYSIS
Press heater switch
Note audible "click" or opening
Evidence of action indicates
intermittently "ON"
and closing valve action (by
normal solenoid valve operation.
and "OFF".
touch) of both solenoid valves
No audible "click" or action
(fuel supply and fuel return).
indicates solenoid valve(s) is
defective.
To Check Solenoid
With switch in "ON" position,
Fuel flow indicates solenoid
Valve and Fuel Filter:
note fuel flow from tee opening
valve is operating properly and
Disconnect one fuel
with each purge pump stroke.
fuel filters are satisfactory.
tube from engine front
No fuel or restricted flow
solenoid valve outlet
indicates manifold heater filter or
tee, operate purge
felt filters in solenoid valve are
pump and press heater
restricted or clogged.
switch "ON" and
With switch in "OFF" position
If fuel flow stops, solenoid valve
"OFF".
note that fuel flow stops.
is closing properly.
If fuel flow continues, solenoid
valve is defective (stuck open).
PROCEDURE
OBSERVATION
ANALYSIS
To Check Return Fuel
With switch in "ON" position,
Moderate flow indicates solenoid
Solenoid Valve and
note fuel flow from check valve
valve is operating properly and
Check Valve: Remove
opening.
check valve is opening properly.
fuel return solenoid
No fuel or restricted flow
outlet tube after the
indicates check valve stuck
check valve at rear of
closed or felt filters in solenoid
engine, operate purge
valve are restricted or clogged.
pump and press heater
With switch in "OFF" position
If fuel flow stops, solenoid valve
switch "ON" and
note that fuel flow stops.
is closing properly.
"OFF".
If fuel flow continues, solenoid
valve is defective (stuck in open
position).
PROBABLE CAUSE
CORRECTIVE ACTION
a. (Continued) Manifold heater solenoid
(2) Replace solenoid valve (WP 0087, Manifold
valves defective.
Heater Fuel Filter and Solenoid
Replacement).
WP 0015 00-3
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