Nissan 12279-4Z001 Seal-Oil,CRANKSHAFT Rear

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Wedge a prybar or two screwdrivers behind the crankshaft pulley and carefully pry it off. If it is still difficult to remove, use a bolt-type puller.

The old seal can be removed using a hammer and punch by driving it out from the back side.

If a seal installation tool is unavailable, a large socket, section of pipe, or a blunt tool can be used to carefully drive the new seal into position.

The transmission must be removed from the vehicle for this procedure.

Next, take out the right inner wheel well and the drivebelts.

Use a screwdriver wrapped with tape to pry out the seal, being careful not to gouge or nick the housing.

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.

Inspect the surface of the crankshaft pulley where the oil seal makes contact; if it is grooved from prolonged contact, replace the crankshaft pulley.

After removing the old seal, clean the bore to eliminate any remnants of the old seal material and corrosion.

The remaining steps are the reverse of removal.

Take care to work the stiff lip onto the seal journal of the crankshaft without rushing, as this may damage the seal.

Slowly and carefully push the seal onto the crankshaft, using a smooth object such as the end of a socket extension, while pushing the retainer against 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.

Using a seal driver or a socket slightly smaller than the seal's outside diameter, carefully drive the new seal into place, ensuring it is installed squarely and to the same depth as the original, while checking that the garter spring remains in place.

Remove the crankshaft pulley and carefully pry the seal out of the cover using a seal removal tool or a large screwdriver, taking care not to scratch, gouge, or distort the area where the seal fits to prevent oil leaks.

Apply a continuous 1/8-inch bead of RTV sealant.

Install the seal so that its rear edge is flush with the face of the engine block or up to 0.020 inch recessed.

The remaining steps are the reverse of removal.

Carefully work the lip onto the seal journal of the crankshaft, taking care not to rush and damage the seal.

Use a blunt tool, such as a brass punch, to carefully work the edge of the seal evenly into the bore and around the crankshaft.

Apply a bead of RTV sealant to the sealing surface of the new retainer and lightly lubricate the oil seal lip with clean engine oil.

Complete the installation by reversing the removal steps, then run the engine and check for any oil leaks.

After installation, run the engine and check for any oil leaks.

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.

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.