1. Install the O-ring to the cylinder block.
NOTE:
Use new O-rings.
2. Install the oil pump.
Tightening torque:
6.4 N·m (0.7 kgf-m, 4.7 ft-lb)
3. Install the chain cover. 
4. Install the oil pan upper and strainer.
5. Install the vacuum pump.
6. Install the scavenge pump.
7. Install the crank pulley.
8. Install the V-belts.
9. Install the engine to the vehicle.
10. Refill the engine oil.