Oil Pump

DISASSEMBLY

Oil Pump Components AW-4 Automatic Transmission:

1. Remove pump body O-ring.
2. Remove pump seal.
3. Remove pump seal rings.
4. Remove bolts attaching stator shaft to pump body and separate components.
5. Remove drive gear and driven gear from pump body.

ASSEMBLY

Checking Pump/Stator Shaft Bushings:

1. Measure inside diameter of pump body bushing with bore gauge or inside micrometer. Diameter should be maximum of 38.19 mm (1.5035 inch). Replace pump body if bushing I.D. is greater than specified.
2. Measure inside diameter of stator shaft bushing. Take measurements at front and rear of bushing. Diameter should be maximum of 21.58 mm (0.08496 inch) at front and 27.08 mm (1.0661 inch) at rear. Replace stator shaft if bushing diameter is greater than specified.

Checking Pump Gear Clearances:

3. Measure oil pump clearances.
- Clearance between pump driven gear and pump body should be maximum of 0.3 mm (0.012 inch).
- Clearance between tips of pump gear teeth should be maximum of 0.3 mm (0.012 in).
- Clearance between rear surface of pump housing and pump gears should be maximum of 0.1 mm (0.004 inch).
4. Replace pump body and gears if any clearance is greater than specified.

Installing Pump Seal:

5. Install new seal with Seal Installer 7549.
6. Lubricate and install gears in pump body.
7. Assemble stator shaft and pump body. Tighten shaft-to-body bolts to 10 Nm (7 ft. lbs.) torque.
8. Install new O-ring on pump body and new seal rings on stator shaft.

Checking Pump Gear Rotation:

9. Install pump in torque converter and check pump gear rotation. Gears must rotate smoothly when turned clockwise and counterclockwise.
10. Lubricate pump O-ring and seal rings with petroleum jelly.