Replacing the front main oil seal:
You will need:
1. Jack
2. Gear Puller (super cheap $30- $40)
3. Socket Set
4. Breaker Bar (maybe)
5. Torque Wrench (expensive - borrow one if you can)
6. New Seal (Nissan Part: 13510–53J10)
Procedure:
1. Take driver side wheel off
2. Take inner guard off
3. Crack nut on pulley (27 mm) (you may need two people)
Put into 5th gear or get someone to hold brake pedal down
Do not take nut completely off just crack it
If possible the use of a rattle gun will make life alot easier here.
4. Undo belt tensioners
14mm for the Tensioners and the Engine mount bracket.
5. Remove belts
6. Remove driver’s side engine mount support left side of engine on jack
(I used the bracket for the air-con condenser to the block)
7. Slowly drop engine until pulley is fully visible
(you don't actually have to do this, but you can if you need to).
8. Use gear puller to remove pulley (this is the important part)
Turn nut one or two full revolutions and use gear puller until nut is tight again
Take off gear puller and turn nut one or two full revolutions etc repeat this step until pulley is off
(Use the puller that doesn't have the claws on it. Chances are, you can warp the pulley or run the risk of chipping the outside of the pulley off. I used a steering wheel puller like this:
9. Take out old seal out (be careful not to damage a steel washer that is behind the seal)
10. New seal needs to be inserted evenly with a bit off oil on out side of seal (I used an old pipe that’s diameter was just smaller than the seal outer edge and a rubber mallet).
11. Insert pulley again evenly as per last step
12. put every thing back together again make sure belts and crank pulley nut is at right tension or torque as per workshop manual
Hope this helps,