Moin! I have a classic bearing damage to a crankshaft bearing, while dismantling the crankshaft further damage to two of the other bearings was noticed. However, there are no bars or grinding marks to be recognized but a ca. 1mm deep holefrass. (see pictures) Is a mystery how such a thing can happen to me??? There are also no discolorations of the metal which would indicate strong heat effect. Has anyone seen this before or an idea what the cause is? Could? Thank you very much for every info! LG