Oil Pump

Removal & Installation

To Remove:

1. Remove the oil pressure gauge unit.
2. Remove the oil filter.
3. Remove the oil filter bracket and gasket.
4. Remove the drain plug and gasket.
5. Remove the Lower Oil Pan and bolts then put a wooden block against the Lower Oil Pan as shown in illustration and remove by tapping with a hammer.

   CAUTION
   Do not use an oil pan remover tool (MD998727) because it can damage the Upper Oil Pan.

6. Remove the cover.
7. When removing the Upper Oil Pan, first remove the bolts marked (A) as shown. Next, remove all of the other bolts.

8. Thread the bolt into the bolt hole marked (1) to float and remove the oil pan.

   CAUTION
   To avoid damage, do not use a scraper or a special tool to remove the oil pan.

9. Remove flat baffle plate.
10. Remove oil screen and gasket.
11. Remove curved baffle plate.
12. Remove the plug.
13. Remove relief spring and relief plunger.
14. Before removing the crankshaft oil seal, make alignment marks on the inner and outer rotors to use for reference during installation.
15. Remove the oil pump case and O-ring.
16. Remove the oil pump cover.
17. Remove the oil pump outer and inner rotors.

To Install:

1. Before installing the oil pump inner and outer rotors, apply clean engine oil to the rotors. When installing the rotors, make sure the alignment marks made at removal line up.
2. Install the oil pump cover.
3. Install the O-ring.
4. To install the oil pump case, follow these steps:
   • Step 1: Remove the sealant from the cylinder block and oil pump.
   • Step 2: Apply a .118 in (3mm) diameter bead of sealant (Mitsubishi Genuine #MD970389 or equivalent) to the oil pump case. Install the oil pan within 15 minutes, while sealant is still wet.
   • Step 3: After installation, keep the sealed area away from the oil and Coolant for about 1 hour.

5. Install the crankshaft oil seal by using the special tool (MD998717) to knock the oil seal into the oil pump case. Make sure to knock the seal in until it is completely based.

6. Install relief spring and relief plunger.
7. Install the plug.
8. Install curved baffle plate.
9. Install oil screen and gasket.
10. Install flat baffle plate.
11. To install the Upper Oil Pan and bolts, follow these steps:
    • Step 1: Clean the gasket surfaces of the cylinder block and Upper Oil Pan.
    • Step 2: Apply a .157 in (4 mm) diameter bead of sealant (Mitsubishi Genuine #MD970389 or equivalent) to the oil pump case. Install the oil pan within 15 minutes, while the sealant is still wet.
    • Step 3: After installation, keep the sealed area away from the oil and Coolant for about 1 hour.

    CAUTION
    During installation of the Upper Oil Pan, do not expel the sealant from the oil pan flange at point (Q) as illustrated.

    Upper Oil Pan torque sequence

12. Install the cover.
13. To install the Lower Oil Pan and bolts, follow these steps:
    • Step 1: Clean the gasket surfaces of the upper and Lower Oil Pans.
    • Step 2: Apply a .157 in (4 mm) diameter bead of sealant (Mitsubishi Genuine #MD970389 or equivalent) to the oil pump case. Install the oil pan within 15 minutes, while the sealant is still wet.
    • Step 3: After installation, keep the sealed area away from the oil and Coolant for about 1 hour.

    Lower Oil Pan torque sequence

14. Install the drain plug and gasket as shown.

    Drain plug gasket installation

15. Install the oil filter bracket and gasket.
16. When installing the oil filter, follow these steps:
    • Step 1: Clean the installation surface of the filter bracket.
    • Step 2: Apply clean engine oil to the O-ring of the oil filter.
    • Step 3: Screw on the oil filter until the O-ring contacts the bracket. Tighten about one turn to 10 ft-lb (14 Nm).
17. When installing the oil pressure gauge unit, coat the threads of the unit with sealant (3M ATD #8660 or equivalent) and install the switch.

CAUTION
Do not get sealant on the end of the threaded part and avoid overtightening the fastener.