Models with single overhead camshaft engine
Removal
1. If the engine is not removed from the vehicle, drain the cooling system as described in Chapter 2.
2. On 1.4 and 1.6 l models (except C16 NZ2) remove the rear timing belt cover. On C16 NZ2, 1.8L and 2.0L models, remove the timing belt (see Section 2A).
3. Remove the timing belt tensioner roller from the oil pump where applicable.
4. Loosen and remove the cooling system pump mounting bolts (see illustration).
5. Remove the coolant pump from the cylinder block and remove the O-ring (see illustrations). You may have to tap the pump lightly with a mallet to loosen it from the cylinder block.
6. If necessary, remove the rear timing belt cover from the pump.
7. It is not possible to overhaul the cooling system pump, and if it is faulty, replace the pump unit
Installation
8. Installation is carried out in reverse order, paying attention to the following.
9. When installing the pump, use a new O-ring. Before installation, apply silicone grease or petroleum jelly to the pump installation area in the cylinder block and the O-ring
10. Do not fully tighten the pump mounting bolts before the timing belt is installed and tensioned.
11. Install and tension the toothed drive belt as described in Section 2A.
12. If the engine is in the vehicle, fill the cooling system as described in Chapter 4.
Models with twin overhead cam engines
Removal
13. Remove the lower engine protection plate.
14. If the engine is in the vehicle, drain the cooling system as described in Chapter 2.
15. Remove the timing belt, camshaft sprockets, crankshaft sprocket, timing belt tensioner and idler rollers, and timing belt rear cover as described in Section 2B.
16. Proceed as described in points 4 and 5.
17. It is not possible to overhaul the cooling system pump. If the pump is faulty, replace it.
Installation
18. Installation is carried out in reverse order, paying attention to the following.
19. Use a new O-ring. Before installing, apply silicone grease or petroleum jelly to the pump mounting area in the cylinder block and the O-ring.
20. Install the pump and before tightening the pump mounting bolts, make sure that the protrusions on the pump and cylinder block are aligned (see illustration).
Text copied from an internet website OpelBook
21. Install the remaining components and tension the timing belt as described in Section 2B.
22. If the engine is in the vehicle, fill the cooling system as described in Chapter 4. Install the lower locking plate.
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