Removal
1.7L engines
1. Remove the ground cable from the battery. For better access, disconnect the crankcase ventilation hose from the rear of the head cover.
2. Remove the nuts securing the voltage supply bus to the glow plugs and remove the bus from the glow plugs.
3. Remove the glow plugs.
2.0L engines
1. Remove the ground cable from the battery. For better access, remove the pipe connecting the turbocharger and manifold.
2. On early models, remove the nuts securing the voltage supply bus to each glow plug (photo on the left), and remove the power supply bus (photo on the right).
3. On later models, disconnect the electrical connectors from the glow plugs.
4. Remove the glow plugs from the cylinder head.
Examination
Check each glow plug for mechanical damage. Burnt or broken glow plug tips may be due to poor fuel spray jet from the injector. If such damage is present, the fuel injectors must be checked and replaced if necessary.
If the glow plugs do not have mechanical damage, check their electrical resistance, which should be less than 1 Ohm.
The glow plugs can be tested for operability by applying 12 volts to them. They should heat up evenly and within the required time interval. The following precautions must be taken:
Hold the glow plug with a special clamp or pliers.
The glow plug power supply circuit must have a fuse.
After checking, the glow plug should cool for several minutes.
A glow plug in good condition heats up to the working cone turning red within 5 seconds. If it heats up longer or heats up in the middle part rather than at the end of the plug, the plug is faulty and must be replaced.
Text copied from this portal www.opelbook.ru
Installation
Installation is carried out in the reverse order of removal.
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