Disassembly

DISASSEMBLY





1. Remove seal rings by undoing hooks.





2. Loosen bolts in numerical order and remove oil pump cover.





3. Remove inner and outer gear from oil pump housing.





4. Remove O-ring from oil pump housing.





5. Remove oil pump housing oil seal.

INSPECTION
Oil pump housing, oil pump cover, inner gear and outer gear
- Check for wear or damage.








Side clearance
- Measure side clearance between end of oil pump housing and inner and outer gears in at least four places along their circumferences. Maximum measured values should be within specified range.

Standard clearance: 0.02-0.04 mm (0.0008 - 0.0016 in)

- If clearance is less than standard, select inner and outer gear as a set so that clearance is within specifications.

Inner and outer gear: Refer to SDS, AT-275.

- If clearance is more than standard, replace whole oil pump assembly except oil pump cover.
- Measure clearance between outer gear and oil pump housing.

Standard clearance: 0.08-0.15 mm (0.0031 - 0.0059 in)

Allowable limit: 0.15 mm (0.0059 in)

- If not within allowable limit, replace whole oil pump assembly except oil pump cover.

Seal ring clearance
- Install new seal rings onto oil pump cover.
- Measure clearance between seal ring and ring groove.

Standard clearance: 0.1-0.25 mm (0.0039 - 0.0098 in)

Allowable limit: 0.25 mm (0.0098 in)

- If not within allowable limit, replace oil pump cover assembly.