The water pump on vehicles with a four-cylinder engine, as well as diesel, is located on the left side of the engine when viewed in the direction of travel and is driven by a V-belt.
On vehicles with a five-cylinder engine, the water pump is also located on the left side of the engine, but is driven by a toothed belt.
On vehicles with a six-cylinder engine, the water pump is driven by the outside of the toothed belt.
The water pump does not require maintenance. Its repair is also impossible. If leaks or rattles occur during operation, the water pump must be replaced as a set.
New gaskets are required when installing the pump (four- and six-cylinder engines, as well as diesel) or new o-ring (five-cylinder engine).
1. Four-cylinder petrol as well as diesel engines. Remove the V-belt first, as well as the power steering pump bracket.
2. Remove the toothed belt guard.
3. Disconnect the water pump housing.
4. Disconnect the pump cover from the body by removing the seven bolts (see illustration).
5. Replace gasket between pump cover and housing. When replacing the pump housing, the gasket between the pump housing and the motor must also be replaced.
6. Tighten the pump cover bolts to 10 Nm and the V-belt pulley bolts to 25 Nm. The tightening torque of the pump housing mounting bolts on the engine for Mb hex bolts is 25 Nm, and M10 is 25 Km.
7. Five-cylinder engine. Remove the power steering pump first.
8. Remove the toothed belt guard.
9. Loosen the toothed belt tension and remove the toothed belt from the water pump gear (see illustration).
10. Turn out bolts of fastening of the water pump and remove it.
11. Install a new water pump with a new O-ring.
12. Screw in the water pump mounting bolts and tighten them with a torque of 20 Nm.
13. Apply a toothed belt and without fail check the functioning of the gas distribution mechanism.
14. Tighten the toothed belt. Six-cylinder engine. When replacing the water pump, the owner of a car with this engine is faced with a problem regarding the removal of the toothed belt (see illustration 9.0a).
15. Remove the ribbed belt.
16. Remove a gear belt.
17. Turn out nine bolts on the case of the water pump and remove the case.
18. Replace gasket.
19. Screw in the pump housing mounting bolts and tighten them in two passes with a torque of 10 Nm.
20. Install a toothed belt and without fail check the functioning of the gas distribution mechanism.
Attention! Do not operate vehicles with four-cylinder petrol or diesel engines without a water pump drive V-belt. This can cause severe engine damage.
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