Removal
1. Remove the engine and gearbox assembly from the vehicle. Separate the gearbox from the engine.
2. Install the engine on a special stand (special tool), see the "Cylinder Block" section.
3. Drain the oil through the drain hole in the oil pan.
4. Remove the following parts:
- Valve cover
- Camshafts
- Cylinder head assembly
- Oil pan (upper and lower)
- Coarse oil filter
5. Remove the crankshaft pulley.
Using a locking plate (special tool) secure the drive disk, then loosen the crankshaft pulley bolt.
Screw in the puller bolts (special tool) into the pulley holes and remove the pulley. (Bolt dimensions: M6x1.0, length approx. 40 mm).
Note: If the crankshaft pulley is being removed on the vehicle, remove the pulley bolts as follows:
1) Remove the drive belts.
2) Support the engine with a jack and remove the center support beam (see below).
3) Remove the rear cover located where the oil pan connects to the gearbox.
4) Using a flat-head screwdriver, secure the toothed ring and unscrew the crankshaft pulley bolts.
5) Using a puller (special tool) remove the crankshaft pulley.
6. Remove the front cover. If the front oil seal needs to be replaced, pry it up with a flat-head screwdriver as shown in the figure.
The text was borrowed from here NissanBook.ru
7. Remove the timing chain guide at the bending point, the timing chain guide at the tension point, the oil pump drive sleeve and the crankshaft sprocket.