Nissan 12296-31U10 RETAINER Assembly-Oil Seal, Rear

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

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.

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

Apply multi-purpose grease to the crankshaft seal journal and the lip of the new seal.

The retainer should be clean, and a thin coat of engine oil should be applied to the outer edge of the new seal before installation.

Position the seal and retainer assembly between two wood blocks and drive the old seal out with a hammer and punch. Alternatively, a screwdriver can be used to pry the seal out.

A seal installation tool should ideally be used.

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

Carefully pry the old seal out of the retainer with a seal removal tool or screwdriver.

The seal lips must be lubricated with clean engine oil or multi-purpose grease. Additionally, RTV sealant should be applied to the retainer housing to block surface, and it is important to ensure that the dowel pins are in place before installing the retainer.

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.