Isuzu KB P190. Manual - part 1043

UNIT REPAIR (AW30–40LE)

7A4–37

Oil Pump

Disassembly View

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Disassembly

1. Use torque converter as work stand.

Remove 2 oil seal rings from stator shaft.

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Legend

(1) Oil pump body
(2) Oil pump drive gear
(3) Oil pump driven gear

(4) Stator shaft
(5) O-ring
(6) Oil seal ring

7A4–38

UNIT REPAIR (AW30–40LE)

2. Remove the O-ring.

3. Remove the stator shaft.

4. Remove the oil pump drive gear.

5. Remove the oil pump driven gear.

6. Remove the oil pump body.

Remove 13 bolts, and then remove the stator shaft
from oil pump body.
Then remove drive and driven gear.

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Inspection and Repair

Make necessary correction or parts replacement if wear,
damage or any abnormal conditions are found through
inspection.

1. Check oil pump body bushing.

Using a dial indicator, measure the inside diameter
of the oil pump body bushing.

Maximum inside diameter: 38.19mm (1.5035 in)

If the inside diameter is greater than the maximum,
replace the oil pump body.

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2. Check stator shaft bushing.

Using a dial indicator, measure the inside diameter
of the stator shaft bushing.

Maximum inside diameter: Front side: 21.58 mm
(0.8496in)

Maximum inside diameter: Rear side: 27.08 mm
(1.0661in)

If the inside diameter is greater than the maximum,
replace the stator shaft.

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3. Check tip clearance of both gears.

Measure between the gear teeth and the
cresent-shaped part of the pump body.

Standard tip clearance: 0.11 – 0.14 mm (0.0043 –
0.0055 in) 

Maximum tip clearance: 0.19mm (0.0075 in) 

If the tip clearance is greater than the maximum,
replace the drive gear, driven gear or pump body.

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UNIT REPAIR (AW30–40LE)

7A4–39

4. Check body clearance of driven gear.

Push the driven gear to one side of the body.
Use a feeler gauge, measure the clearance.

Standard body clearance: 0.07 – 0.15mm (0.0028
– 0.0059in) 

Maximum body clearance: 0.2mm (0.0079in) 

If the body clearance is greater than the maximum,
replace the drive gear, driven gear or pump body.

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5. Check side clearance of both gears.

Using a steel straightedge and a feeler gauge,
measure the side clearance of both gears.

Standard side clearance: 0.02 – 0.05mm (0.0008 –
0.0020in) 

Maximum side clearance: 0.1mm (0.004in) 

If the side clearance is greater than the maximum,
replace the drive gear, driven gear or pump body.

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6. Check oil seal.

Check for wear, damage or cracks.
If necessary, replace oil seal.
Pry off the oil seal with a screwdriver.

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Using special tool, install a new oil seal.
The oil seal end should be flush with the outer edge
of the pump body.
Oil seal installer : 5-8840-2256-0
Coat the oil seal lip with multipurpose grease.

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7A4–40

UNIT REPAIR (AW30–40LE)

Reassembly

1. Place the oil pump body on the torque converter.

2. Coat the driven gear and drive gear with ATF.

3. Install the driven gear and drive gear.

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4. Align the stator shaft with the bolt holes.

Tighten the thirteen bolts.

Torque: 10 N·m (1.0 kg·m/87 Ib·in)

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5. Install the oil seal ring.

• Coat the oil seal rings with ATF.

• Contract the oil seal rings as shown, and install

them onto the stator shaft.

NOTE:  Do not spread the ring ends too much.

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6. Coat a new O-ring with ATF and install it to the oil

pump body.
O-ring size (Reference)

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Inside diameter

204.9mm (8.067in)

Thickness

3.5mm (0.138in)