Nissan 13510-31U00 Seal-Oil,Crankshaft Front

It is preferable to use a seal installation tool to press the new seal into place.

It is important to avoid scratching, gouging, or distorting the area where the seal fits, as this could lead to an oil leak.

The remaining steps involve reversing the removal process.

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.

Loosen the tool's wingnut, install the tool onto the rear of the crankshaft to cover the sealing surface, and tighten the wingnut.

Remove the crankshaft pulley.

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.