Oil Pump

Disassembly





1. Remove two seal rings (1) and clutch drum thrust washer (2) from stator shaft subassembly back side.

NOTE: Never reuse seal rings after removal.

2. Remove oil pump cover (1) by removing eight torx bolts (2) using torx wrench.





3. Remove oil pump body oil seal.

NOTE: Never reuse oil seal after removal.

Reassembly





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
: Grease 99000-25030
2. Install driven gear and drive gear to oil pump body after applying fluid to gears.





3. Install oil pump cover (1) to oil pump body (2) and tighten eight torx bolts (3) to specification.
Tightening torque
Oil pump cover bolts (a): 10 Nm (1.0 kgf-m, 7.5 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 (1).

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 flat end rods or the like and make sure it rotates smoothly.

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

Inspection





1. Check body clearance of driven gear (1).
Push driven gear (2) to one side of oil pump body (3). Using a feeler gauge, measure clearance between driven gear (2) and body (3). If clearance exceeds standard value, replace gear.
Clearance between driven gear and body
Standard: 0.075 - 0.15 mm (0.00295 - 0.0059 inch)





2. Check tip clearance of both drive and driven gears.
Measure radial clearance between gear tooth tip and crescent (1). If clearance exceeds standard value, replace gears.
Clearance between driven gear and crescent
Standard: 0.010 - 0.248 mm (0.0004 - 0.0098 inch)
Clearance between drive gear and crescent
Standard: 0.013 - 0.292 mm (0.0005 - 0.0115 inch)





3. Check side clearance of both gears.
Using a straightedge (1) and a feeler gauge, measure side clearance between gears and pump body.
If clearance exceeds standard value, replace gears.
Side clearance between gears and oil pump body
Standard: 0.02 - 0.05 mm (0.0008 - 0.0019 inch)
Drive gear and driven gear have some kinds of thickness as listed.





Drive gear and driven gear thickness

If side clearance of the thickest gear is out of specification, replace oil pump body or assembly and stator shaft subassembly.