97
Fill Cycle
Stages of Injection
F U E L M A N A G E M E N T S Y S T E M
45
• The injection cycle has three (3) stages.
• Fill.
• Main injection.
• End of main injection.
• During some conditions the injector will
perform all three steps of the injection cycle
two times per firing cycle. This is called pilot
injection.
• During the fill stage, the spool valve is in the
closed position.
• High pressure oil from the oil rail is dead
headed at the spool valve.
• Low pressure fuel fills the port below the
plunger.
• The needle control spring holds the needle
on its seat so that fuel can not enter the
combustion chamber.
Three Stages of Injection
• Fill
• Main Injection
• End of Main Injection
96
SPOOL VALVE
CLOSED
FUEL INLET
PINTLE CLOSED
INTENSIFIER PISTON
AT REST
Summary of Contents for 6.0L POWER STROKE
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Page 6: ...1 Direct Injection Turbocharged Diesel Engine 6 0L Power Stroke ...
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Page 94: ...W I R I N G D I A G R A M D U A L A LT 93 ...
Page 104: ...N O T E S 103 ...
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Page 106: ...2002 International Truck and Engine Corporation Printed in the U S A ...