Repairing a water pump usually does not lead to the desired result, so it is recommended to replace the pump assembly.
1. Disconnect the wire from the "–" terminal of the battery.
2. Drain the coolant (see "Replacing the coolant").
3. Set the piston of the 1st cylinder to the TDC position (see "Setting the piston of the first cylinder to the TDC position of the compression stroke").
4. Remove the tension roller (see "Replacing the tension roller").
Warning! After removing the camshaft drive belt, do not turn the camshaft or crankshaft.
5. Remove the camshaft timing pulley (see "Replacing the cylinder head gasket").
6. Loosen the nut and remove the four bolts securing the rear cover of the camshaft drive.
7. Move the rear cover aside and remove the water pump by prying it up by the toothed pulley with a screwdriver.
8. Remove the gasket from the pump. Replace the damaged gasket.
9. Replace the water pump if coolant is leaking through the drain hole (the pump seal is damaged)…
10. …there is a noticeable axial play of the pump shaft (the pump bearing is damaged)…
11. …cracks, chips, and flaking were found on impeller 1, toothed pulley 2, and pump housing 3.
12. Check the tightness of the pump bearing lock screw. Tighten the screw if necessary.
13. Install the pump in the reverse order of removal. The number on the pump should be facing up.
14. Install the remaining parts in the reverse order of removal. Install the camshaft pulley with the protruding part of the hub toward the engine.
15. After this, check the alignment of the TDC marks on the camshaft pulley and the rear cover of the drive belt (see "Setting the piston of the first cylinder to the TDC position of the compression stroke").
16. Adjust the tension of the camshaft drive belt (see "Replacing the camshaft drive belt and adjusting the belt tension") and fill with coolant (see "Replacing the coolant").