Quantcast ENGINE FAILS TO START AT NORMAL CRANKING SPEED

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TM 9-2815-220-24
ENGINE FAILS TO START AT NORMAL CRANKING SPEED
THIS WORK PACKAGE COVERS:
TROUBLESHOOTING TABLE AND DIAGNOSTIC TESTS
INITIAL SETUP:
Tools:
Personnel Required
General mechanic's tool kit (item 121, WP 0176)
Track Vehicle Repairer (2) 63H10
Equipment Conditions:
Engine installed in vehicle or ground hop.
MALFUNCTION 1:
Cylinders not firing (insufficient fuel or incomplete combustion).
PROBABLE CAUSE
CORRECTIVE ACTION
a. Out of fuel.
(1) Refuel.
b. Air in fuel system.
(1) Bleed and purge system (WP 0020, Fuel
System Abnormal Conditions).
c. Cylinders too cold. Applies in cold weather.
(1) Operate engine intake manifold heater to
assist in starting (refer to pertinent vehicle
manual).
(2) If engine does not start, check heater
operation as follows:
PROCEDURE
OBSERVATION
ANALYSIS
Heater Operational Check
Hold fuel shut-off
(engine "stop") switch
and crank engine.
While cranking engine,
engage manifold heater
switch and hand
operate purge pump.
Note housing temperature (warm or hot to
Place hand on intake
Evidence of heat
manifold heater housing. touch).
indicates heater
Check both sides of
operation is normal.
engine.
No heat indicates heater
is inoperative.
Heater Voltage Checks
NOTE
Disconnect purge pump fuel hose quick-disconnect coupling at engine
before performing test.
WP 0008 00-1

 


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