Oil Pump

REMOVAL & INSTALLATION

2.2L and 2.5L Engines

1998-99 VEHICLES

1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
2. Remove or disconnect the following:
   • Negative battery cable
3. Drain the coolant into a suitable separate container.
4. Remove or disconnect the following:
   • Timing belt
   • Belt tensioner bracket
   • Engine coolant pipe, if necessary
   • Left side camshaft sprocket and left side belt cover, if necessary
   • Water pump
   • Oil pump mounting bolts
   • Oil pump by carefully prying it from the engine block

   WARNING
   Use extreme care not to damage the engine block or the oil pump during removal of the pump.

   To install:

5. Measure the tip clearance of the rotors. If clearance is greater than 0.0071 in. (0.18mm), replace the rotors.
6. Measure the clearance between the outer rotor and the cylinder block rotor housing. If clearance exceeds 0.0079 in. (0.20mm), replace the rotor.
7. Measure the side clearance between the oil pump inner rotor and the pump cover. If clearance exceeds 0.0047 in. (0.12mm), replace the rotor or pump body.
8. Install a new front oil seal on the pump cover using a driver.
9. Assemble the oil pump.
10. Apply sealant and a new O-ring to the oil pump.
11. Install or connect the following:
    • Oil pump and tighten the bolts to 60 inch lbs. (7 Nm)
    • Water pump
    • Left side camshaft sprocket and left side belt cover
    • Engine coolant pipe, if necessary
    • Belt tensioner bracket
    • Timing belt
    • Negative battery cable
12. Fill and bleed the cooling system.
13. Start the engine and check for leaks.

2000-03 VEHICLES

1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
2. Remove or disconnect the following:
   • Negative battery cable
   • Engine under cover
3. Drain the coolant into a suitable separate container.
   • Radiator main fan and sub fan assemblies, on Impreza models
   • Radiator, on Legacy models
   • Crankshaft Position (CKP) and Camshaft Position (CMP) sensors
   • Drive belts
   • Rear side V-belt tensioner
   • Crankshaft pulley using a suitable tool
   • Water pump
   • Timing belt guide, if equipped with a manual transaxle
   • Crankshaft sprocket
   • Oil pump mounting bolts
   • Oil pump by carefully prying it from the engine block

   WARNING
   Use extreme care not to damage the engine block or the oil pump during removal of the pump.

   To install:

4. Measure the tip clearance of the rotors. If clearance is greater than 0.0071 in. (0.18mm), replace the rotors.
5. Measure the clearance between the outer rotor and the cylinder block rotor housing. If clearance exceeds 0.0079 in. (0.20mm), replace the rotor.
6. Measure the side clearance between the oil pump inner rotor and the pump cover. If clearance exceeds 0.0059 in. (0.15mm), replace the rotor or pump body.
7. Assemble the oil pump.
8. Apply sealant and a new O-ring to the oil pump.
9. Install or connect the following:
   • Oil pump and tighten the bolts to 60 inch lbs. (7 Nm)
   • Crankshaft sprocket
   • Timing belt guide, if equipped with a manual transaxle
   • Water pump
   • Crankshaft pulley using a suitable tool
   • Rear side V-belt tensioner
   • Drive belts
   • CKP and CMP sensors
   • Radiator, on Legacy models
   • Radiator main fan and sub fan assemblies, on Impreza models
   • Engine under cover
   • Negative battery cable
10. Fill and bleed the cooling system.
11. Start the engine and check for leaks.