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Engine – 2.5L Duratec-HE (122kW/165PS) - MI4 303-01A-11 303-01A-11 DESCRIPTION AND OPERATION Item Description $ Torque (Nm) % Engine speed (rpm) Service note: The valve clearance of the engine only needs to be monitored if the engine is converted to operation using alternative fuel (every 60,000 km). Conversion of the engine to operation with alternative fuel requires no modification to the engine as the valve seats are reinforced as standard. All that is required is an adaptation of the fuel system. Valves and valve seats The engines for petrol operation and gas operation are basically identical. Because gas is a dry fuel and combusts at a higher temperature, the valve train is under higher stress. The adaptations described below are therefore necessary. Because of the higher stress involved in gas operation: ‡ The inlet and exhaust valves are made of a harder material. ‡ The inlet and exhaust valve seats and the valve stems are made of a harder material. ‡ The valve clearances must be checked more frequently and corrected if necessary. Lubrication System The engine lubrication system operates as follows: ‡ Oil is drawn into the oil pump through the oil pump screen cover and tube in the sump of the oil pan. ‡ Oil is pumped through the oil filter on the right front side of the cylinder block. ‡ Oil enters the main gallery where it is distributed to the crankshaft main journals and to the cylinder head. ‡ From the main journals, the oil is routed through cross-drilled passages in the crankshaft to lubricate the connecting rod bearings. Controlled leakage through the crankshaft main bearings and connecting rod bearings is slung radially outward to cool and lubricate the cylinder walls Item Description & Power output (kW) as well as the entire connecting rod, piston and piston ring assembly.