1. Set the vehicle on a lift.
2. Remove the collector cover. (turbo model)
3. Disconnect the ground cable from battery.
4. Lift up the vehicle.
5. Remove the under cover.
6. Lower the vehicle.
7. Remove the radiator. 
8. Remove the crankshaft position sensor.
9. Remove the water pump.
10. Remove the crank sprocket.
11. Remove the bolts which install oil pump onto cylinder block.
NOTE:
When disassembling and checking the oil pump, loosen the relief valve plug before removing the oil pump.
12. Remove the oil pump by using flat tip screwdriver.
CAUTION:
Be careful not to scratch mating surfaces of cylinder block and oil pump.
13. Remove the front oil seal from the oil pump.