Oil Pump

REMOVAL & INSTALLATION

3.0L Engines

NOTE: Whenever the oil pump is disassembled or the cover removed, the gear cavity must be filled with petroleum jelly to seal the pump and act as a prime. Do not use grease.

1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
2. Disconnect the negative battery cable.
3. Drain the engine oil.
4. Remove or disconnect the following:
   • Front engine mount bracket and accessory drive belts
   • Timing belt upper and lower covers
   • Timing belt and crankshaft sprocket
   • Oil pan
   • Oil screen and gasket
   • Front cover mounting bolts. Note the lengths of the mounting bolts as they are removed for proper installation.
   • Front case cover and oil pump assembly

   To install:

5. Thoroughly clean all gasket material from all mounting surfaces.
6. Apply engine oil to the entire surface of the gears or rotors.
7. Assemble the front case cover and oil pump assembly to the engine block.
8. Install or connect the following:
   • Oil screen with new gasket
   • Oil pan
   • Crankshaft sprocket and timing belt
   • Timing belt covers
   • Drive belts and the front engine mount bracket
   • Negative battery cable, refill the crankcase and check for adequate oil pressure

3.5L Engine

1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
2. Remove or disconnect the following:
   • Negative battery cable
   • Timing belt
3. Drain the engine oil.
4. Remove or disconnect the following:
   • Splash shield from the wheel well
   • Oil filter adapter
   • Lower and upper oil pans
   • Lower baffle, oil pump pick-up and upper baffle
   • Oil pump case mounting bolts and the oil pump case
   • Oil pump gear cover
5. Make matchmarks on the oil pump rotors before removing them.
6. Remove the crankshaft seal from the oil pump case.

   To install:

7. Install a new crankshaft seal in the oil pump cover.
8. Apply engine oil to the rotors, then align the matchmarks and install the rotors in the oil pump case.
9. Install the rotor cover. Tighten the bolts to 84 inch lbs. (10 Nm).

   Fig. 1: Apply sealant to the rear of the oil pump case — 3.5L engine

10. Apply a 0.113 in. (3mm) bead of sealant to the back of the oil pump case. Install the case on the engine and tighten the bolts to 10 ft. lbs. (13 Nm).
11. Install or connect the following:
    • Upper baffle plate and oil pump pick-up using a new gasket–Tighten the baffle bolts to 84 inch lbs. (10 Nm) and the pick-up bolts to 13 ft. lbs. (18 Nm).
    • Lower baffle in the upper oil pan. Tighten the bolts to 96 inch lbs. (11 Nm).
    • Oil pans
    • Oil filter adapter using a new gasket. Tighten the larger bolt to 30 ft. lbs. (41 Nm) and the smaller bolt to 17 ft. lbs. (23 Nm).
    • Timing belt and remaining components
12. Fill the engine with the correct amount of oil.
13. Connect the negative battery cable.
14. Start the engine and check for leaks.

    Fig. 2: Exploded view of the oil pump mounting — 3.5L engine

2.0L (4G63) and 2.4L (4G64) Engines

NOTE: Whenever the oil pump is disassembled or the cover removed, the gear cavity must be filled with petroleum jelly to seal the pump and act as a prime. Do not use grease.

1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
2. Disconnect the negative battery cable. Rotate the engine so No. 1 cylinder is on TDC of its compression stroke.
3. Drain the engine oil.
4. Using the proper equipment, support the weight of the engine. Remove the front engine mount bracket and accessory drive belts.
5. Remove or disconnect the following:
   • Timing belt upper and lower covers
   • Timing belt and crankshaft sprocket
   • Electrical connector from the oil pressure sending unit
   • Oil pressure sensor
   • Oil filter and the oil filter bracket
   • Oil pan, oil screen and gasket

     Fig. 4: Use the special socket and holder to remove the balance shaft plug — Eclipse 2.0 (4G63) engine

6. Using special tool MD998162, remove the plug cap in the engine front cover.
7. Remove or disconnect the following:
   • Plug on the side of the engine block. Insert a steel rod with a shank diameter of 0.32 in. (8mm) into the plug hole. This will hold the silent shaft.
   • Driven gear bolt that secures the oil pump driven gear to the silent shaft
   • Front cover mounting bolts. Note the lengths of the mounting bolts as they are removed for proper installation.
   • Front case cover and oil pump assembly. If necessary, the silent shaft can come out with the cover assembly.
   • Oil pump cover, located on the back of the engine front cover. Remove the oil pump drive and driven gears.
8. After disassembling the oil pump, clean all components and remove gasket material from mating surfaces.
9. Assemble the oil pump gears into the front case and rotate it to ensure smooth rotation and no looseness. Be sure there is no ridge wear on the contact surface between the front case and the gear surface of the oil pump front cover.

   To install

10. Align the timing mark on the oil pump drive gear with that on the driven gear and install them into the engine front case. Apply engine oil to the gears.

    Fig. 5: Aligning oil pump timing marks — Eclipse 2.0L (4G63) engine

11. Install the oil pump cover and tighten the retainer bolts to 13 ft. lbs. (18 Nm) on Eclipse models and 17 ft. lbs. (24 Nm) on Galant models.
12. Using the appropriate driver, install a new crankshaft seal into the front case.
13. Position new front case gasket in place. Set seal guide tool MD998285 on the front end of the crankshaft to protect the seal from damage. Apply a thin coat of oil to the outer circumference of the seal pilot tool.
14. Install the front case assembly through a new front case gasket and temporarily tighten the flange bolts.
15. Mount the oil filter on the bracket with new oil filter bracket gasket in place. Install the bolts with washers and tighten to 14 ft. lbs. (19 Nm).
16. Insert a Phillips screwdriver into the hole in the left side of the engine block to lock the silent shaft in place.
17. Install or connect the following:
    • Oil pump drive gear onto the left silent shaft. Tighten the driven gear bolt to 27 ft. lbs. (37 Nm).
    • New O-ring to the groove in the front case and install the plug cap. Tighten the cap to 17 ft. lbs. (24 Nm).
    • Oil screen in position with new gasket in place
18. Clean both mating surfaces of the oil pan and the cylinder block. Apply sealant in the groove in the oil pan flange.

    NOTE: After applying sealant to the oil pan, do not exceed 15 minutes before installing the oil pan.

19. Install or connect the following:
    • Oil pan to the engine and secure with the retainers. Tighten bolts to 60 inch lbs. (7 Nm).
    • Oil pressure gauge unit and the oil pressure switch
    • Electrical harness connector
    • Oil cooler. Oil cooler bolt to 31 ft. lbs. (43 Nm).
20. Refill the crankcase. Install new oil filter.
21. Connect the negative battery cable and start the engine. Verify correct oil pressure. Inspect for leaks.

    Fig. 6: Front case bolt identification — Eclipse 2.0L (4G63) and 2.4L (4G64) engines

2.0L (420A) Engine

1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
2. Disconnect the negative battery cable.
3. Drain the engine oil.
4. Remove or disconnect the following:
   • Rear plate
   • Oil filter and adapter
   • Oil pan
   • Oil pick-up tube
   • Timing belt
5. Remove the crankshaft sprocket.
6. Remove the crankshaft oil seal.
7. Remove or disconnect the following:
   • Oil pump mounting bolts
   • Oil pump

   To install:

8. Apply a bead of sealant to the sealing surface of the oil pump and install a new O-ring into the counterbore on the oil pump discharge passage.
9. Carefully install the oil pump on the crankshaft until seated to the engine block. Torque the bolts to 17 ft. lbs. (23 Nm).
10. Install or connect the following:
    • New crankshaft oil seal in the oil pump
    • Crankshaft sprocket using the proper installation tools

      Fig. 7: Crankshaft sprocket installation — Eclipse 2.0L (420A) engine

    • Timing belt and related components
    • Oil pick-up tube
11. Apply Loctite® 18718, or equivalent, at the point where the oil pump meets the engine block.
12. Install the oil pan using a new gasket. Torque the mounting bolts to 108 inch lbs. (12 Nm).
13. Use a new O-ring and install the oil filter adapter to the engine. Made sure the roll pin aligns with the hole. Torque the assembly to 40 ft. lbs. (55 Nm).

    Fig. 8: Oil filter adapter installation — Eclipse 2.0L (420A) engine

14. Install or connect the following:
    • New oil filter
    • Rear plate
15. Refill the engine with the proper amount of oil.
16. Start the engine and check for leaks.

1.5L and 1.8L Engines

NOTE: Whenever the oil pump is disassembled or the cover removed, the gear cavity must be filled with petroleum jelly to seal the pump and act as a prime. Do not use grease.

1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
2. Remove or disconnect the following:
   • Negative battery cable
   • Front engine mount bracket and accessory drive belts
   • Timing belt upper and lower covers
   • Timing belt and crankshaft sprocket
   • Oil pan and remove the oil screen
   • Front cover mounting bolts. Note the lengths of the mounting bolts as they are removed for proper installation.
   • Front case assembly and oil pump assembly
   • Oil pump cover
   • Inner and outer gears from the front case

   To install

3. Remove all gasket material from the mating surfaces and clean all parts.
4. Thoroughly coat both oil pump gears with clean engine oil and install them in the correct direction of rotation.
5. Install the pump cover and tighten the bolts to 84 inch lbs. (10 Nm).
6. Coat the relief valve and spring with clean engine oil. Install them and tighten the plug to 33 ft. lbs. (45 Nm).
7. Install or connect the following:
   • New front crankshaft seal and coat the lips of the seal with clean engine oil
   • Front case and oil pump assembly to the engine block using a new gasket. Tighten the bolts to 10 ft. lbs. (14 Nm).
   • Oil screen with new gasket. Torque the screen bolts to 14 ft. lbs. (19 Nm).
   • Oil pan
   • Crankshaft sprocket and timing belt
8. Fill the crankcase to the proper level.
9. Connect the negative battery cable.