Oil Pump: Service and Repair

Removal
1. Disconnect negative cable at battery.
2. Drain engine oil.
3. Drain coolant.
4. Remove oil pan, oil pump strainer and timing chain cover.
5. Loosen oil pump chain guide bolts.





6. Remove oil pump (1) from crankcase (2).

CAUTION: Do not remove oil pump sprocket or bolt. Otherwise, oil pump sprocket and/or oil pump rotor shaft might be damaged.

Installation





1. Install oil pump to crankcase.
Tightening torque
Oil pump mounting bolt (short) (c): 27 Nm (2.7 kgf-m, 19.5 ft. lbs.)
Oil pump mounting bolt (long) (d): 27 Nm (2.7 kgf-m, 19.5 ft. lbs.)
2. Hand tighten oil pump chain guide bolts (2)





3. To take up the slack of oil pump chain , push center of oil pump chain guide (1) with a force of 0.5 to 0.6 N (50 - 60g 0.11 - 0.13 lb.) the tighten oil pump chain guide bolts (2) to specified torque.
Tightening torque:
Oil Pump Chain Guide Bolt: 11 Nm (1.1 kgf-m, 8.0 ft. lbs.)
4. Install timing chain cover, oil pump strainer and oil pan.

Disassembly





Disassemble oil pump as shown in the figure.

CAUTION:
Do not remove oil pump sprocket or bolt.
Otherwise, oil pump sprocket and/or oil pump rotor shaft might be damaged.

Reassembly
1. Wash, clean and then dry all disassembled parts.
2. Apply thin coat of engine oil to inner and outer rotors, and inside surfaces of oil pump case.





3. Assemble oil pump. After assembling oil pump check to be sure that rotor turns smoothly by hand.
Tightening torque
Oil pump bolt (a): 12 Nm (1.2 kgf-m, 9.0 ft. lbs.)

Inspection
^ Check outer rotor, inner rotor and oil pump cases for excessive wear or damage.
^ Check relief valve for excessive wear or damage.





^ Measure free length and tension of oil relief spring.
Spring (for oil pump) free length 63.5 mm (2.5 inch)
Spring (for oil pump) preload 86.0 N for 52.0 mm (8.6 kg for 52.0 mm, 62.2 lb. for 2.05 inch)





^ Measure clearance of oil pump rotor and oil pump case using thickness gauge.
Radial Clearance
Check radial clearance between outer rotor (2) and case (1), using thickness gauge (3).
If clearance exceeds its limit, replace oil pump assembly.
Radial clearance between oil pump outer rotor and oil pump case
Limit: 0.15 mm (0.0059 inch)

Side Clearance





Using straightedge (5) and thickness gauge (4), measure side clearance. If clearance exceeds its limit, replace oil pump assembly.
Oil pump side clearance
Limit: 0.11 mm (0.0043 inch)