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Engine – 2.5L Duratec-HE (122kW/165PS) - MI4 303-01A- 303-01A- DESCRIPTION AND OPERATION Item Description 1 Engine code Variable camshaft timing (VCT) 774 63 32 331 E83423 Item Description 1 Control unit - variable camshaft timing 2 Camshaft bearing cap 3 VCT oil control solenoid This system is an electronically controlled camshaft adjuster that allows variable timing for the inlet camshaft. The valves are driven by a timing chain which drives the inlet camshaft timing control unit. This unit drives the associated camshafts. The timing chain is tensioned using a conventional timing chain tensioner. The inlet camshaft is fitted with a sensor ring for the active camshaft position (CMP) sensor. This CMP sensor is mounted inside the valve cover. Timing chain replacement does not require the variable camshaft timing control unit to be disconnected. Item Description 2 Engine serial number 5 6 Item Description 4 Valve cover 5 Camshaft Position Sensor 6 Camshaft sensor ring To ensure trouble-free operation of the variable camshaft timing system and optimum engine performance, it is essential to adhere precisely to the valve timing adjustment procedure. A special tool is needed to fix the camshafts in the adjustment position. Remember that this special tool must not be used to keep the camshaft from rotating when mounting the camshaft sprocket. They may only be kept from rotating by using the hexagon, which has been specially provided for this purpose. Advantages of variable camshaft timing (VCT). ‡ Lower fuel consumption due to improved volumetric efficiency