Oil pump repair

Attention! The oil pump gears are matched in pairs and both gears should be replaced if necessary.

1. Apply to the back surface of the outer gear (greater) a sign for its installation in the same position relative to the internal gear (lesser) during the assembly process, in which it was removed from the factory packaging.

2. Remove the engine oil pan.

3. Remove the oil pump by unscrewing the three bolts securing the pump to the cylinder block.

4. Remove the oil pump cover and remove the gears, and remove the oil supply pipe to the pump.

5. Punch a hole in the middle of the rubber plug on the pump bypass valve.

6. Remove the rubber plug with a bolt of the appropriate diameter.

7. Remove the spring and bypass valve piston.

8. Insert both gears into the pump housing, observing their correct relative position.

9. Using a ruler and a feeler gauge, measure the gap between the plane of the pump housing and the rear planes of the gears. If it exceeds the maximum allowable value, the pump housing must be replaced.

10. Use a feeler gauge to check the clearance between the outer gear and the pump housing. If it exceeds the maximum allowable value, the pump housing must be replaced.

11. Lubricate parts of the bypass valve with engine oil and install the bypass valve.

12. Install the bypass valve rubber plug with the flat side facing out. It should be on the edge of the sealing surface of the oil supply pipe to the pump.

13. Lubricate both pump gears with engine oil.

14. Install the oil pump cover and tighten its bolts to the correct torque.


15. Insert the shaft that transmits the drive from the intermediate shaft (the end with an asymmetrical protrusion must be directed towards the ignition distributor), into the pump drive shaft and, turning it by hand, make sure that the pump gears interact without jamming.

16. Install the gasket and oil supply line to the pump.

17. Install the oil pump to the cylinder block, tightening the mounting bolts to the correct torque.



18. Attach the oil pan to the cylinder block. Start with a bolt (A) To (IN), and then with the bolt (IN) To (A).