- Disconnect the negative battery cable. Raise and safely support the vehicle.
- Remove the timing belt.
- Remove the retaining bolt and remove the crankshaft sprocket. Drain the engine oil and remove the oil pan.
- Remove the oil pump pickup tube-to-oil pump bolts, the tube and gasket.
- Remove the oil pump-to-cylinder block bolts, the pump and gasket.
- If necessary, pry the oil seal from the pump and clean the seal bore.
- Clean the gasket mounting surfaces. Inspect the pump and gears for wear.
- Disconnect the negative battery cable. Raise and support the vehicle, safely. Drain the engine oil.
- Remove the oil pan and the oil pump mounting bolt.
- Remove the oil pump and the intermediate shaft from the rear main bearing cap.
- Pull the intermediate shaft out of the oil pump.
- Remove the pump cover screws and remove the pump cover. Remove the inner and outer rotor.
- Using snapring pliers, remove the internal snapring and remove the pressure relief valve assembly.
- Using a small prybar, remove the oil seal from he pump body. Discard the seal.
- Clean all parts in solvent and allow to dry. Check for obvious signs of wear: scoring, galling or distortion of the pump body or cover, worn or damaged pressure relief valve plunger, or a weak or broken spring plunger.
- Measure the side clearance using a straightedge and feeler gauge, as shown in Fig. 4. The clearance must not exceed 0.004 in. (0.10mm).
- Measure the tooth tip clearance using a feeler gauge as shown in Fig. 5. The clearance must not exceed 0.007 in. (0.18mm).
- Measure the outer rotor-to-pump body clearance using a feeler gauge, as shown in Fig. 6. The clearance must not exceed 0.008 in. (0.20mm).
- Replace parts or the entire assembly, as necessary.
- Disassemble the pump and wash all parts in solvent. Use a brush to clean the inside of the pump housing and the pressure relief valve chamber, making sure all dirt and metal particles are removed. Allow the parts to dry.
- Inspect the inside of the pump housing for damage or excessive wear.
- Check the mating surface for wear. Minor scuff marks are normal but if the cover, gears or housing are excessively worn, scored or grooved, replace the pump.
- Inspect the rotor for nicks, burrs, or score marks. Remove minor imperfections with an oil stone.
- Measure the inner-to-outer rotor tip clearance using a feeler gauge, as shown in Fig. 7. The clearance must not exceed 0.010 in. (0.254mm) with a feeler gauge inserted 1 / 2 in. (12.7mm) minimum with the rotors removed from the pump housing.
- With the rotor assembly installed in the housing, place a straight-edge across the rotor assembly and housing. Measure the clearance (rotor endplay) between the inner and outer rotors using a feeler gauge, as shown in Fig. 8. The clearance is 0.0055 in. (0.140mm) maximum.
- Check the relief valve spring tension. The tension should be 9.1-10.1 lbs. @ 1.11 in. (28mm). If the spring is worn or damaged, replace the pump. Check the relief valve piston for freedom of movement in the bore.
- Apply clean engine oil to the pump body and the outside of a new oil seal. Press in the seal using a driver slightly smaller than the outside diameter of the seal.
- Coat the bore and plunger with clean engine oil and install the pressure relief valve plunger and spring in the pump body. Install the snapring.
- Coat the inner and outer rotors with clean engine oil and install in the pump body with the dimples facing the pump cover, as shown in Fig. 9.
- Install the pump cover on the pump body. Apply thread locking compound to the cover mounting screws and tighten to 52-78 inch lbs. (6-9 Nm).
- Make sure the rotor turns smoothly after assembly.
- Coat the inside of the pump body and the inner and outer rotors with clean engine oil.
- Install the rotor assembly in the pump body.
- Install the pump cover. Apply thread locking compound to the cover mounting bolts and tighten.
- Apply a continuous bead of silicone sealer to the oil pump gasket surface.
- Install a new O-ring into the pump body.
- Install the oil pump to the cylinder block; be careful not to cut the oil seal lip. Tighten the 8mm oil pump-to-cylinder block bolts to 14-19 ft. lbs. (19-25 Nm) and the 10mm oil pump-to-cylinder block bolts to 27-38 ft. lbs. (37-52 Nm).
- Install the oil pump pickup tube using a new gasket.
- Install the oil pan and the crankshaft sprocket. Tighten the crankshaft sprocket bolt to 108-116 ft. lbs. (147-157 Nm).
- Connect the negative battery cable and refill the crankcase. Start the engine and check for leaks.
- Insert the pump intermediate shaft into the drive hole in the pump assembly until it clicks into place.
- Pour a small amount of clean oil into the outlet hole in the body of the oil pump.
- Lift the oil pump assembly into place guiding the intermediate shaft through the hole in the rear main bearing cap. Seat the pump securely on the locating dowels.
- Install the pump mounting bolt and tighten to 35 ft. lbs. (48 Nm).
- Install the oil pan.
- Lower the vehicle and refill the crankcase. Connect the negative battery cable, run the engine and check for leaks.