Removal and installation the water pump (Opel Astra G)

Removal

Petrol models

1. Disconnect the negative battery cable (see Chapter Engine electrical equipment).

2. Drain the cooling system (see Chapter Routine maintenance).

3. Remove the timing belt with the tension roller, dOHC models remove the rear belt cover (see Chapter Engine).

4. Where required, mark the position of the pump mounting flange relative to the block surface, then remove the three water pump mounting bolts (1).



5. Remove the pump from its mounting socket in the block (1.6L SOHC and 2.0L DOHC engines), or remove it from the block (1.4, 1.6 and 1.8 L DOHC engines), - if necessary, having first tapped it with a soft-faced hammer.

6. Remove the pump sealing ring - it must be replaced during installation.

The pump cannot be repaired and in case of failure it is replaced with a new one.

Diesel models

1. Set the parking brake, jack up the vehicle and place it on supports. If so equipped, remove the crankcase guard.

2. Disconnect the negative battery cable (see Chapter Engine electrical equipment).

3. Remove the engine protective cover and drain the cooling system (see Chapter Routine maintenance).



4. Remove the air cleaner assembly with the air mass meter sensor and the intake air duct (see Chapter Power and exhaust systems).

5. On 1.7L DOHC and 2.0L engines remove the accessory drive belt (see Chapter Routine maintenance), - before removing the drive belt, loosen the pump pulley mounting bolts.

6. On 1.7L SOHC and 2.0L engines remove the timing belt with the tension roller (see Chapter Engine), - this operation requires hanging the power unit and removing the right support of its suspension with its bracket from the cylinder block.

7. On 1.7L DOHC and 2.0L engines, holding the pump pulley still (use an oil filter wrench or an old drive belt), unscrew the mounting bolts and remove the pulley from the pump drive flange.



3. Remove the water pump mounting bolts.

A — Water pump mounting bolts on 1.7L DOHC models

B — Water pump mounting bolts (2) on 2.0L models

A.

B.

4. Remove the pump assembly from its seat in the block (1.7L engines)/ timing chain covers (2.0L engines - see illustration), if necessary, tapping it first with a soft-faced hammer.





5. Remove the sealing gasket/ring - the sealing element must be replaced during installation.



The pump cannot be repaired and in case of failure it is replaced with a new one.

(The article was published on the website OpelBook)

Installation

Installation is carried out in the reverse order of dismantling the components.

1. Make sure that the mating surfaces of the components are thoroughly cleaned and wiped dry before installation petrol models make sure that the mounting marks/standard installation marks applied during dismantling are correctly aligned. Tighten the mounting bolts with the required force.

The sealing ring should be lightly lubricated with silicone grease before installation.

1. Finally, fill the cooling system and remove air from it (see Chapter Routine maintenance), connect the negative cable to the battery, start the engine and check it for signs of developing coolant leaks.