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:  38.19 mm (1.5035 in)

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

   Fig 1: Measuring Inside Diameter Of Oil Pump Body

   Courtesy of ISUZU MOTOR CO.
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 (0.8496 in)

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

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

   Fig 2: Measuring Inside Diameter Of Stator Shaft Bushing

   Courtesy of ISUZU MOTOR CO.
3. Check tip clearance of both gears.

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

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

   Maximum tip clearance:  0.19 mm (0.0075 in)

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

   Fig 3: Measuring Between Gear Teeth & Crescent-Shaped Part

   Courtesy of ISUZU MOTOR CO.
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 - 0.15 mm (0.0028 - 0.0059 in)

   Maximum body clearance:  0.2 mm (0.0079 in)

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

   Fig 4: Measuring Clearance Using Feeler Gauge

   Courtesy of ISUZU MOTOR CO.
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 - 0.05 mm (0.0008 - 0.0020 in)

   Maximum side clearance:  0.1 mm (0.004 in)

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

   Fig 5: Measuring Side Clearance Of Both Gears

   Courtesy of ISUZU MOTOR CO.
6. Check oil seal.

   Check for wear, damage or cracks.

   If necessary, replace oil seal.

   Pry off the oil seal with a screwdriver.

   Fig 6: Identifying Pry Off Oil Seal With Screwdriver

   Courtesy of ISUZU MOTOR CO.

   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:  J-9617

   Coat the oil seal lip with multipurpose grease.

   Fig 7: Installing New Oil Seal

   Courtesy of ISUZU MOTOR CO.