Oil Pump & Front Cover: Inspection
- Inspect components for damage. Install oil pump gears in front cover. Using feeler gauge, measure gear-to-front cover clearance between tip of teeth on each gear and front cover.
- Place straightedge across front cover above oil pump gears. Using feeler gauge, check gear side clearance between straightedge and both oil pump gears. Check for ridge on oil pump cover in the gear operating area. Ensure relief plunger slides freely in the bore. Check relief plunger spring free length and tension. Replace components if not within specification. See OIL PUMP SPECIFICATIONS table in this article.
- On turbo models, ensure oil cooler by-pass valve slides freely. At normal room temperature, measure distance from valve body to tip of valve. See Fig 1 . Distance should be 1.358" (34.49 mm). Heat oil to 212°F (100°C) and submerge valve in heated oil for a few minutes. Remove valve and measure distance from valve body to tip of valve. Distance should be at least 1.57" (39.88 mm). Replace valve assembly if not within specification.
OIL PUMP SPECIFICATIONS
| Application | In. (mm) | ||||
|---|---|---|---|---|---|
| Gear Side Clearance | |||||
| Drive Gear | |||||
| Standard | .0031-.0055 (.079-.140) | ||||
| Limit | .0098 (.249) | ||||
| Driven Gear | |||||
| Standard | .0024-.0047 (.061-.119) | ||||
| Limit | .0098 (.249) | ||||
| Gear-to-Front Cover Clearance | |||||
| Drive Gear | |||||
| Standard | .0063-.0083 (.160-.211) | ||||
| Limit | .0098 (.249) | ||||
| Driven Gear | |||||
| Standard | .0051-.0071 (.130-.180) | ||||
| Limit | .0098 (.249) | ||||
| Relief Plunger Spring | |||||
| Free Length | 1.835 (46.61) | ||||
| Spring Pressure (1) | 13.4 @ 1.579 (6.0 @ 40.11) | ||||
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