Nissan 13510-31U00 Seal-Oil,Crankshaft Front

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Remove the crankshaft pulley, timing belt covers, and timing belt. Carefully remove the crankshaft sprocket using a prybar or two screwdrivers, taking care not to damage the oil pump body. If the sprocket cannot be pried off, drill and tap two holes into its face and use a bolt-type puller to remove it from the crankshaft, ensuring not to reuse a drilled sprocket. Remove the inner timing belt guide, noting the outward-facing side, and carefully pry the oil seal out with a screwdriver, avoiding any scratches or nicks on the crankshaft. Before installation, apply a thin coat of multi-purpose grease to the inside of the seal. Fabricate a seal installation tool using a short length of pipe slightly smaller than the seal's outside diameter, ensuring the end is free of sharp edges. A long bolt matching the crankshaft pulley bolt thread pitch and a large washer slightly larger than the pipe will also be needed. Press the oil seal into position using the installation tool, tightening the bolt until the seal is bottomed in the housing without turning it further to avoid damage. Install the inner timing belt guide onto the crankshaft nose, ensuring the Woodruff key is in place. Apply a thin coat of assembly lube to the inside of the timing belt sprocket and slide it onto the crankshaft. Finally, reinstall the remaining components in reverse order of removal, tightening all bolts to the specified torque.

The transmission must be removed from the vehicle.

Scrape any sealant or gasket material from the retainer, oil pan, and the block.

The old seal can be removed from the retainer by driving it out from the back side using a hammer and punch. It's important to note how far it's recessed into the retainer bore before removal.

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!

When removing the seal, be careful not to nick or gouge the seal bore or the crankshaft. Avoid scratching, gouging, or distorting the area where the seal fits, as it may cause an oil leak.

Clean the bore to eliminate any old seal material and corrosion.

Remove the driveplate and the bolts from the rear seal retainer.

If the crankshaft is damaged, the new seal will leak.

Take care to work the new seal onto the seal journal of the crankshaft without rushing, as the lip is stiff and can be damaged.

Applying a small amount of oil to the outer edge and inner lip of the new seal will facilitate installation.

Damaging the crankshaft could cause the new seal to leak.

Drive the seal into the bore using a large socket and hammer until it is fully seated, ensuring the socket matches the outside diameter of the seal and that it is pressed into place until it bottoms against the cover flange.

Preferably, a seal installation tool should be used to press the new seal into place.

First, ensure the retainer is clean and apply a thin coat of engine oil to the outer edge of the new seal. The seal must be pressed squarely into the retainer bore; hammering it into place is not recommended. If a press is not available, the retainer and seal can be sandwiched between two smooth pieces of wood and pressed into place using a large vise. The wood must be thick enough to distribute the force evenly around the seal's circumference, and care should be taken to ensure the seal enters the bore squarely.