Remove the crankshaft balancer. Note how the seal is installed; the new one must be installed to the same depth and facing the same way. Carefully pry the oil seal out of the cover with a seal puller, or alternatively, screw a self-tapping screw partially into the seal and use pliers as a lever to pull it from the engine. If the seal is being replaced when the timing chain cover is removed, support the cover on top of two blocks of wood and drive the seal out from the backside with a hammer and punch. Be careful not to scratch, gouge, or distort the area that the seal fits into, or a leak will develop. Apply clean engine oil or multi-purpose grease to the outer edge of the new seal, then install it in the cover with the lip (spring side) facing inward. Drive the seal into place with a large socket and a hammer, or a piece of pipe if a large socket isn't available, ensuring the seal enters the bore squarely and stops when the front face is at the proper depth. Check the surface on the balancer hub that the oil seal rides on; if it has been grooved from long-time contact with the seal, replace the balancer. Lubricate the balancer hub with clean engine oil and install the crankshaft balancer. The remainder of installation is the reverse of the removal.