How do you replace the water pump on an 2003 1.8 318i petrol BMW?

Answer 1

the following has to be done:

- drain coolant from any side of cyl block plug to have it drained less that the pump bottom fitting stud level.

- release and remove driving belt;

- unscrew and remove the fan;

- unscrew all seven studs nuts;

- take a wooden hummer and kick the pump case to release it from thhe gasket;

- take a screw driver and try to separet it from the gasket;

- remove an old gasket;

- clean the cyl block mounting flange;

- unpack the new pump;

- take a die and have all studs threaded ends calibrated;

- use a silicone (T=100 C degrees) to have joining surfases thin covered;

- put on new gasket and pun on new pump on the studs;

- have all nuts tighten in cross (180 degrees);

- be sure the pump shaft is rotated smoothly before the fan is installed;

- install the fan and have it tighten;

- instal driving belt and adjust it;

- open the expansion tank and add coollant having roated the engine to remove an air from the system;

- remain the expantion tank unclosed and start the engine on iddle speed;

- check with both coolant level in the tant and engine temp by hand;

- once the coolant level is stable - add some more collant to be sure thhe level is in limits (marks) as punched on this tank;

- close the lid;

- wash your hands;

- take a beer afterwards .