98
99
Main Injection Step 2
Main Injection Step 1
F U E L M A N A G E M E N T S Y S T E M
46
• Pulse width controlled current energizes the
open coil, magnetic force moves the spool
valve to the open position.
• High pressure oil flows past the spool valve
into the intensifier piston chamber.
• Oil pressure overcomes the intensifier piston
spring force and the intensifier starts to
move.
• Fuel inlet check ball seats due to an
increase of fuel pressure under the plunger.
• Fuel pressure starts to build once the
plunger passes the fuel spill port of the
barrel.
• Force on the nozzle needle begins to build.
• The pulse width controlled current is shut off
after 800
µ
sec (micro second or millionth of
a second), but the spool remains in the open
position.
• High pressure oil from the rail continues to
flow past the spool valve.
• The intensifier piston and plunger continue
to move and pressure increases in the
barrel.
• When fuel pressure rises above the VOP
(Valve Opening Pressure) of about 3100 psi,
the nozzle needle lifts off of it’s seat and
injection begins.
SPOOL VALVE OPEN
INTENSIFIER PISTON
MOVING DOWN
PINTLE CLOSED
SPOOL VALVE OPEN
INTENSIFIER PISTON
MOVING DOWN
PINTLE OPEN
Summary of Contents for 6.0L POWER STROKE
Page 1: ... F Series Super Duty ...
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Page 6: ...1 Direct Injection Turbocharged Diesel Engine 6 0L Power Stroke ...
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Page 91: ...W I R I N G D I A G R A M S I N G L E A LT 90 ...
Page 92: ...W I R I N G D I A G R A M S I N G L E A LT 91 ...
Page 93: ...W I R I N G D I A G R A M D U A L A LT 92 ...
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 ...
Page 105: ...N O T E S 104 ...
Page 106: ...2002 International Truck and Engine Corporation Printed in the U S A ...