F 550 4WD Super Duty V8-7.3L DSL Turbo VIN F (2001)
Exhaust Pressure Regulator: Description and Operation
Exhaust Back Pressure Regulator
NOTE: The Exhaust Back Pressure Regulator is not present on F650/750 models.
Exhaust back pressure is controlled to provide more heat to the coolant for cab heating when ambient air temperature is below 7°C (45°F) and engine
oil temperature is below 75°C (167°F) during low load. At high load, high speed conditions, the back pressure system is disabled.
The exhaust back pressure regulator solenoid and exhaust back pressure piston are contained in the turbocharger mounting pedestal. Turbocharger
pressurized lube oil is routed to the exhaust back pressure solenoid. Oil regulated by the exhaust back pressure solenoid actuates the piston which
operates the back pressure valve in the exhaust housing.
