Oil Pump: Inspection
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 1994 Toyota MR2, 1993 Toyota MR2, 1993 Toyota Celica, 1992 Toyota MR2, and 1992 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
- Check body clearance of driven gear. Push gear to one side of body. Measure body clearance. Clearance is .0028-.0059" (.070-.150 mm). Maximum clearance is .012" (.30 mm). If body clearance is greater than maximum specification, replace drive gear, driven gear or pump body.
- Check tip clearance of both gears. Measure between gear teeth and crescent-shaped part of pump body. Tip clearance is .0043-.0055" (.110-.140 mm). Maximum tip clearance is .012" (.30 mm). If tip clearance is greater than maximum specification, replace drive gear, driven gear or pump body.
- Check side clearance of both gears. Using a steel straightedge and feeler gauge, measure side clearance of both gears. Clearance is .0008-.0020" (.020-.050 mm). Maximum side clearance is .004" (.10 mm). If side clearance is greater than the maximum allowable specification, replace drive gear, driven gear or pump body. There are 3 different thicknesses for drive and driven gears. Refer to the OIL PUMP DRIVE & DRIVEN GEAR SPECIFICATIONS table.OIL PUMP DRIVE & DRIVEN GEAR SPECIFICATIONS
ID Mark Thickness: In. (mm) "A" .3717-.3723 (9.440-9.456) "B" .3723-.3730 (9.456-9.474) "C" .3730-.3736 (9.474-9.490) - Measure inside diameter of oil pump body bushing. Maximum inside diameter is 1.5031" (38.180 mm). If inside diameter is greater than maximum specification, replace oil pump body. On A-241H, measure inside diameter of stator shaft bushings. Maximum inside diameter of front side bushing is .8492" (21.570 mm). Maximum inside diameter of rear side bushing is 1.0657" (27.070 mm). If inside diameter is excessive, replace stator shaft.
- Inspect front oil seal for cracks, damage or wear. Use screwdriver to remove oil seal if replacement is necessary.