Vectra B
Field Remedy: 1826
Remedy:Most frequent failures Failure mode: - thermal overload at centre-, ground electrode, insulator foot - broken centre-, ground electrode - insulator foot broken - thread damaged, wrenched Fault causes: - tightening torque too low - tightening torque too high 1. Thermal overload (Picture I) Tightening torque too low ( < 15 Nm) - spark plug was not correct tightened thereby the heat transfer was disturbed - centre-, ground electrode and insulator foot are melted 2. Broken centre electrodes (Picture II) Tightening torque too low ( < 15 Nm) - outer sealing ring thickness > 1,4 mm - vibration marks at the terminal head Through vibrations the spark plug loosened and the centre electrode broke. 3. Broken centre- and ground electrode (Picture III) Tightening torque too low ( < 15 Nm) - thickness of outer sealing ring > 1,4 mm The spark plugs loosened caused by vibrations. Hence it follows breaking of ground- and centre electrode and break out of the insulator foot. 4. Insulator foot fracture (Picture IV) Tightening torque too high (> 35 Nm) - outer sealing ring thickness < 1,2 mm Compound housing/insulator loosened Spark plug got untight Through shaking of the plug the spark plug has been completely destructed. 5. Thread wrenched Tightening torque too high (> 50 Nm) - strong tracks of the spark plug -wrench at the hexagon - forced rupture in the thread Subsequent damage (e.g. engine, cylinder) caused by described failures must not be covered by warranty.
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