Check for Thermal Overload

Through friction of clutch plate on the friction surface of the dual mass flywheel temperatures up to 200°C can arise during normal driving. At sliding clutch or through operating errors much higher temperatures can arise. These temperatures must not cause mandatory a reduced lifetime of the dual mass flywheel.

Possible indications for a high thermal load are:

• Tarnish (bluish) as well as local hotspots on friction surface
• Tarnish (bluish) near of mounting area and riveting area of clutch

If all other checkable features are well, the dual mass flywheel can stay in the vehicle.

Possible indications for a too high thermal load are:

• Cracks
• Fusion zones on friction surface (material smear)
• Scores in friction surface (for example through clutch lining riveting at destroyed or worn clutch plate)
• Tarnish (bluish) which reaches up to bearing area of dual mass flywheel
• Bluish discoloration of locating pins (3 locating pins in outer zone of dual mass flywheel)

In these cases the dual mass flywheel has to be replaced.