01-020 Illuminating cylinders Preceding work: Removing spark plugs (15-018). C iylinder (01) . . . . . . . . . . . . . . . . . , . . . . . . . . illuminate with cylinder inspection lamp (Ol), distinguish between “optical rub marks and seizing rub marks”. “Optical rub marks” may result from the ring gap. Traces of honing are still visible, engine in order. “Seizing rub marks”; honing marks no longer visible, recondition engine. Commercial tool Cylinder inspection lamp 8. g. Karl Storz GmbH, D-7200 Tuttlingen Motoskop TW (cold light) with lens probes 103 26 CW (570 mm) and 103 26 CT (210) 01 0904 - 02011