Removal and installation or replacing the water pump (N46)
Attention:
- Risk of steam burn.
- These works should be performed only on a cold engine.
Attention:
- Collect the drained coolant and send it for disposal.
- Observe the applicable national disposal regulations.
1. Remove the alternator drive belt. 2. Unscrew the coolant drain plug from the radiator.
3. Drain and dispose of the coolant.
Note:
- The water pump with thermostat and power steering pump can only be removed and installed together.
- The power steering pump remains on the vehicle.
4. Unlock and disconnect the cooling system hoses (1-3).
Note: The power steering pump hoses remain connected.
Note: The water pump is secured to the power steering pump with only two bolts.
5. Align the power steering pump pulley with one of the water pump bolts.
6. Loosen the first bolt between the water pump and the power steering pump approximately one turn.
Tightening torque: 32 Nm.
7. Align the power steering pump pulley with the second water pump bolt.
8. Loosen the second bolt between the water pump and the power steering pump by approximately one turn.
Tightening torque: 32 Nm.
9. Loosen the bolts and remove the power steering pump together with the water pump from the cylinder block.
Note: When installing, you must remove the cover.
Note:
- When installing, the sealing surfaces must be clean and free of grease.
- Replace the profile gasket (1).
10. Remove the thermostat.
Note:
- When installing, the sealing surfaces must be clean and free of grease.
- Replace the sealing ring.
11. Remove the thermostat housing.
Note:
- When installing, the sealing surfaces must be clean and free of grease.
- Replace the sealing ring.
Note: When installing, it is necessary to lubricate the clutch disc between the power steering pump and the water pump.
12. Adjust the water pump clutch disc relative to the power steering pump drive.
13. Connect the water pump and the power steering pump.
Note:
- When installing, insert the bolts from the front through the power steering pump pulley and pre-tighten to approx. 5 Nm.
- The bolts are finally tightened only after the power steering pump mount on the cylinder block has been tightened.
Note: A corrugated cover (2) is installed between the circular sealing rings (1) to provide protection against dust. Clean or replace the protective cover.
14. Replace the O-rings (1) on the connecting elements.
15. Lubricate the O-rings (1) with coolant to facilitate sliding.
16. Pre-install the connecting elements into the water pump.
17. Assemble the engine.
18. Bleed the cooling system and check it for leaks.
[Examine the original source using the link on the website: «BMWman.ru»]