• The EGR cooler is a coolant to air heat
exchanger that is used to cool the exhaust
gases before they are sent to the EGR
valve.
• The exhaust gasses are routed into the EGR
cooler from the exhaust up pipes at the rear
of the engine.
• The exhaust gasses are cooled by passing
through metal tubes that are surrounded by
engine coolant. Depending on conditions,
the temperature drop across the cooler
could be as much as 700°F.
• The cooled gasses are then routed to the
EGR valve that is mounted in the intake
manifold.
EGR Cooler
EGR Flow
EGR Valve
A I R M A N A G E M E N T S Y S T E M
37
• The PCM controlled EGR (Exhaust Gas
Recirculation) valve adds cooled exhaust
gases to the intake manifold to reduce NOx
emissions.
• The EGR valve is opened during steady
state throttle positions when exhaust back
pressures are higher than intake manifold
pressures (boost).
• The EGR valve has two valves connected by
a common shaft.
• Cooled exhaust gases come to the center of
the valve through a passage in the intake
manifold.
• When the valves open they allow exhaust
gases to flow into the intake air stream from
the top and bottom of the passage.
76
78
77
EGR VALVE
EGR COOLER
EGR COOLER
EXHAUST CONNECTION
COOLED EXHAUST
O-RING SEALS
INTAKE
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 ...