AH01.00-P-0300-01A General Information on Inspecting Cylinder Walls

General information on inspecting cylinder walls





1. Pressure gloss marks, smoothings, individual blank points e.g. in middle of cylinder or in the area of cylinder head bolts.
Re-use crankcase.





2. Visible streaks, traces of rubbing starting from the first piston ring, run out after approximately 30 mm.

Traces of dry rubbing which cannot be felt, caused by oil film being washed off by fuel, e.g. during frequent cold starts in short distance driving. These traces of rubbing which occur principally in the area of the cylinder head bolts and on the pressure side are not a problem provided they are smoothed. The piston rings are not damaged. Re-use crankcase.





3. Ring shaped prints
Visible in the upper and lower reversal range of piston rings, are not a reason for complaint. Re-use crankcase.





4. All around blank, mirror-like, polished cylinder surfaces Mostly starting from the first piston ring, in the upper cylinder range, with measurable and partial cylinder wear. Cylinder wall unusable.





5. Rough streaks, friction seizure starting from the first and second piston ring, run out only in the cylinder bottom section.Traces of rubbing as described in item 2, which have advanced to signs of seizure. Piston rings may be damaged. If damage can be felt, cylinder wall unusable.
6. Individual continuous scratches caused by contaminations, e.g. through reverse pulsation of soot particles out of the exhaust. Re-use crankcase.
7. Piston seizure Cylinder wall usually perceptibly roughened over the entire length. Material deposits and perceptible traces of seizure on cylinder wall and at piston skirt. Cylinder wall unusable.
8. Brown coloration of the cylinder surface
Oil varnish is over large areas of the cylinder barrel and indicates, that the engine was driven at a high temperature level.
Re-use crankcase provided no impermissible cylinder distortion is present. Oil varnish above piston ring zone is normal and is not a reason for complaint.