Remove the crankshaft balancer. If a seal is fitted, it requires a screwdriver or hook tool to remove it without damaging the oil pump cover bore or the crankshaft's nose and sealing surface. Another way is to drill holes on both sides and insert self tapping screws when used with a pair of pliers, the seal can be unscrewed without prying. If the seal is being replaced while the timing chain cover is off, the cover should be supported on two pieces of wood and the seal should be driven from back using a hammer and punch in a manner which will not scratch or distort the area where the seal fits so as to cause leakage. Using the clean engine oil or preferably the multi-purpose grease apply it on the outer rim of the new seal and then insert it into the cover with the lip facing inside then put a large socket on it and hit it with a hammer until it is firmly in its place and at the correct depth. If a large socket is not possible, then a piece of pipe, can be used instead. Look for wear and tear signs on the surface of the balancer hub, in particular, grooving from the constant contact with the seal; if found, the balancer will have to be changed. Coat the balancer hub with clean engine oil and then, fit the crankshaft balancer, and the rest will follow this process in the reverse manner.