Oil Pump

DISASSEMBLY





1. Remove two seal rings and clutch drum thrust washer from stator shaft subassembly back side.

NOTE: Never reuse seal rings after removal.





2. Remove stator shaft subassembly by removing eight torx bolts using torx wrench.
3. Remove oil pump body oil seal.

NOTE: Never reuse oil seal after removal.

INSPECTION





1. Check body clearance of driven gear. Push driven gear to one side of body. Using a feeler gauge, measure clearance between driven gear and body. If clearance exceeds its limit, replace gear.
Body clearance
Standard: 0.075 - 0.15 mm (0.00295 - 0.0059 inch)
Limit : 0.3 mm (0.011 inch)





2. Check tip clearance of both drive and driven gears. Measure radial clearance between gear tooth and crescent. If clearance exceeds its limit, replace gear.
Tip clearance
Standard: 0.01 - 0.248 mm (0.00040 - 0.00976 inch)
Limit : 0.3 mm (0.011 inch)





3. Check side clearance of both gears.
Using a straightedge and a feeler gauge, measure side clearance between gear and pump body.
Side clearance
Standard: 0.02 - 0.05 mm (0.0008 - 0.0019 inch)
Limit : 0.1 mm (0.0039 inch)





Drive gears and driven gears are different in thickness as listed.
If side clearance of the thickest gear is out of specification, replace oil pump body or assembly and stator shaft subassembly.

ASSEMBLY





1. Install pump body oil seal.
Use special tool and hammer to install it, and then apply grease to its lip portion.
Special Tool
(A): 09944-66020
2. Install driven gear and drive gear to pump body after applying fluid to gears.





3. Install stator shaft subassembly to pump body and tighten eight torx bolts to specification.
Tightening Torque
(a): 12 Nm (1.2 kg.m, 9.0 ft. lbs.)

NOTE: Be sure to tighten bolts alternately and uniformly. (The figure indicates a typical example of the tightening sequence.)





4. Install two new seal rings.

NOTE: Do not spread ring end excessively.

5. Apply A/T fluid to clutch drum thrust washer and install them.
6. Check drive gear and driven gear rotation. Turn drive gear with two screwdrivers and make sure it rotates smoothly.

NOTE: Be very careful not to damage oil seal lip.