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Ford FCSD TECHNICAL TRAINING FCS-14000-DL Manuel d'utilisateur Page 49

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LESSON 3: POWERTRAIN
The basics of VCT operation are:
•
A hydraulic timing mechanism (VCT phaser) rotates the camshafts in relation to their drive sprockets.
– Provides performance that is precisely tailored to the engine speed and load.
– VCT is electronically controlled (PCM duty cycled) and hydraulically operated.
•
The VCT solenoid moves a spool valve to control the flow of oil through the VCT system.
– Oil flows from the head into the VCT valve body.
– Oil flows through the advance or retard passages as directed by the spool valve.
•
Major sensor inputs:
– CMP
– Oil temperature sensor
2005 Expedition/Navigator New Model Technician Training 02-SEP-04 3-13
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