Remove the crankshaft pulley, timing belt covers and timing belt. Carefully remove the crankshaft sprocket with a prybar or two screwdrivers, being very careful not to damage the oil pump body. If the sprocket cannot be pried off, drill and tap two holes into the face of the sprocket and use a bolt-type puller to pull it off the crankshaft. Do not reuse a drilled sprocket - replace it. Remove the inner timing belt guide, noting the side facing out (mark it if necessary). Carefully pry the oil seal out with a screwdriver. If the crankshaft is nicked or otherwise damaged, the new seal will leak! Don't scratch or nick the crankshaft in the process! Before installation, apply a thin coat of multi-purpose grease to the inside of the seal. Fabricate a seal installation tool with a short length of pipe of equal or slightly smaller outside diameter than the seal itself. File the end of the pipe that will bear down on the seal until it's free of sharp edges. You'll also need a long bolt of the same thread pitch as the crankshaft pulley bolt and a large washer, slightly larger in diameter than the pipe, on which the bolt head can seat. Install the oil seal by pressing it into position with the seal installation tool. When the seal is bottomed in the housing, don't turn the bolt any more or you'll damage the seal. Install the inner timing belt guide onto the nose of the crankshaft. Make sure the Woodruff key is in place in the crankshaft. Apply a thin coat of assembly lube to the inside of the timing belt sprocket and slide it onto the crankshaft. Installation of the remaining components is the reverse of removal.