Oil Pump Service/Inspection

Fig. 23 Exploded View Of Oil Pump:

3A-C, 4A-C, 4A-GE, 4A-GEC, 4A-GEL, 4A-GELC, 4A-GZE & 4A-LC ENGINES

1. Remove oil pump cover, drive gear and driven gear, Fig. 135.
2. Remove oil seal and relief valve subassembly.
3. Check contact surfaces of oil seal and drive gear for damage and wear.

Fig. 136 Checking oil pump drive gear clearance. 3A-C, 4A-C, 4A-GE, 4A-GEC, 4A-GEL, 4A-GELC, 4A-GZE, 4A-LC, 22R, 22R-E & 22R-TE engines:

4. Measure clearance between drive gear and driven gear crescents, Fig. 136. If clearance is greater than .0138 inch (.35 mm), replace rotor set.

Fig. 137 Checking side clearance between rotor & cover. 3A-C, 4A-C, 4A-GE, 4A-GEC, 4A-GEL, 4A-GELC, 4A-GZE, 4A-LC, 22R, 22R-E & 22R-TE engines:

5. Measure side clearance between rotor and cover, Fig. 137. If clearance exceeds .0039 inch (.10 mm), replace rotor or pump body as necessary.

Fig. 9 Checking Driven Rotor & Pump Body Clearance:

6. Measure body clearance between driven rotor and pump body, Fig. 138. If clearance is greater than .0079 inch (.20 mm), replace rotor or pump body as necessary.