I received a small update from the engine rebuilder who just started working on the engine by taking it apart and measuring the bearings, cranckshaft, pistins etc.
I have to wait untill Monday before I can take detailed pictures, but he informed me that the cranckshaft and bearings are OK, but the clearance between the pistons and cylinders is between 0,12mm and 0,16mm. According to him this is twice as much as regular.
I did call my dealer for factory specifications, but they have no such data for the M88 engine, only for the S38 that apart from the B38 engine has the same bore. The chief-mechanic send me the data by fax so will compare them with the obtained results before drawing conclusions.
According to the engine rebuilder, the measured wear is twice as much as what is normally accepted. He suggests going oversize and use new oversize pistons.