Toyota
Jeep Cherokee
 Service Manual
Transmission and transfer case » AW-4 automatic transmission » Disassembly and assembly
Oil pump

DISASSEMBLY

(1) Remove pump body O-ring (Fig. 199).

(2) Remove pump seal.

(3) Remove pump seal rings (Fig. 199).

(4) Remove bolts attaching stator shaft to pump body and separate components.

(5) Remove drive gear and driven gear from pump body (Fig. 199).

Fig. 199 Oil Pump Components
Fig. 199 Oil Pump Components

1 - PUMP SEAL
2 - PUMP BODY
3 - STATOR SHAFT
4 - SEAL RINGS
5 - GEAR
6 - O-RING

ASSEMBLY

(1) Measure inside diameter of pump body bushing with bore gauge or inside micrometer (Fig. 200).

Diameter should be maximum of 38.19 mm (1.5035 in.). Replace pump body if bushing I. D. is greater than specified.

(2) Measure inside diameter of stator shaft bushing (Fig. 200). Take measurements at front and rear of bushing. Diameter should be maximum of 21.58 mm (0.08496 in.) at front and 27.08 mm (1.0661 in.) at rear. Replace stator shaft if bushing diameter is greater than specified.

Fig. 200 Checking Pump/Stator Shaft Bushings
Fig. 200 Checking Pump/Stator Shaft Bushings

1 - BORE GAUGE
2 - PUMP BODY BUSHING
3 - BORE GAUGE
4 - STATOR SHAFT BUSHING

(3) Measure oil pump clearances (Fig. 201).

  •  Clearance between pump driven gear and pump body should be maximum of 0.3 mm (0.012 in).
  •  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 in.).

(4) Replace pump body and gears if any clearance is greater than specified.

Fig. 201 Checking Pump Gear Clearances
Fig. 201 Checking Pump Gear Clearances

(5) Install new seal with Seal Installer 7549 (Fig.

202).

Fig. 202 Installing Pump Seal
Fig. 202 Installing Pump Seal

1 - SEAL INSTALLER TOOL
2 - PUMP SEAL

(6) Lubricate and install gears in pump body.

(7) Assemble stator shaft and pump body. Tighten shaft-to-body bolts to 10 N·m (7 ft. lbs.) torque.

(8) Install new O-ring on pump body and new seal rings on stator shaft.

(9) Install pump in torque converter and check pump gear rotation (Fig. 203). Gears must rotate smoothly when turned clockwise and counterclockwise.

(10) Lubricate pump O-ring and seal rings with petroleum jelly.

Fig. 203 Checking Pump Gear Rotation
Fig. 203 Checking Pump Gear Rotation

1 - OIL PUMP
2 - TORQUE CONVERTER

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