Vehicles with 2.5L diesel engine (X25DT)
The fan viscous coupling should be replaced if there is rust on its hub. This causes the fan to either stop or rotate with great difficulty when the engine is stopped. Also replace the coupling if it has significant axial or radial play. In addition, there should be no oil leaks on the coupling hub.
Removal
1. Remove the engine compartment protection (see the relevant chapter).
2. Using a 32mm wrench, unscrew the fan from the water pump hub (see illustration).
(Material copied from the portal: OpelBook.ru)
Attention! The fan mounting nut has a left-hand thread, so you need to unscrew it to the right (counterclockwise).
When unscrewing the nut, the water pump drive belt should be tightened, thus holding the hub from turning. In specialized workshops, the 1 KM-821 device is used for this purpose (see illustration 7.0). You can make such a device yourself from a steel sheet. After loosening the nut, you can unscrew it by rotating the fan impeller. Make sure that the impeller does not fall down.
3. Remove the fan by pushing it downwards.
Warning! Do not place the fan with a viscous coupling horizontally. They should only be placed vertically!
If necessary, separate the impeller and coupling by unscrewing the three mounting bolts.
Installation
4. Install the viscous coupling into the fan and secure with bolts applying a torque of 10 Nm.
Caution: To avoid damaging the coupling threads, do not tighten the bolts with excessive force.
5. Secure the fan with the coupling installed to the water pump hub by tightening the nut to 20 Nm while holding the hub from turning.
Caution! Do not allow the nut to become crooked when installing. The nut has a left-hand thread.
6. Install the engine compartment protection.
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