Discolouration of the sliding layer and / or the back of the bearing
DESCRIPTION OF THE DAMAGE
- Blue-ish to black discolouration of the sliding layer or on the back of the bearing
- Accompanied by lumps and material removal / displacement
Following bearing seizure, the back of the bearing is black in colour.
The tarnishing colour can be seen in the sliding layer.
Possible causes
- Consequential damage due to increasing temperature development as a result of initial rubbing marks, seizure or edge wear
- Insufficient heat dissipation provided by the lubricant
Remedy
If overheating damage occurs, the bearing must be replaced and the causes investigated. In the event of consequential damage, the cause of the primary damage must be rectified. If no further damage to the bearing is visible, the lubricant circuit and the stress on the bearing must be checked.