For 1.6 litre DOHC petrol engines, begin by draining the cooling system. Loosen the water pump pulley bolts before removing the auxiliary drivebelt, then take off the drivebelt. Unscrew the bolts to detach the pulley from the water pump, followed by unscrewing the mounting bolts to remove the water pump from the cylinder block. During refitting, clean the mating surfaces thoroughly and use a suitable sealant if the original pump is being reused, then refill the cooling system. For 1.6 litre SOHC and 2.0 litre petrol engines, drain the cooling system and remove the camshaft timing belt, ensuring the lower part of the timing belt guard remains in place and the timing belt is covered to protect it from coolant. Remove the securing bolts and the rear timing belt guard, then withdraw the water pump from the engine block, recovering the O-ring seal. If the pump is faulty, it must be replaced. During refitting, use a new O-ring lubricated with coolant, install the pump with the cast lug facing down, and refill the cooling system. For diesel engines, start by draining the cooling system and removing the camshaft timing belt while keeping the lower part of the timing belt guard intact and covering the belt. Unscrew the timing belt idler pulley and push it downwards, then unscrew the water pump retaining bolts to remove the pump from the engine block, recovering the O-ring seal. If the pump is faulty, it must be renewed. For refitting, use a new O-ring lubricated with coolant, install the pump with the cast lug facing down, and refill the cooling system.