General information on inspecting cylinder walls - AH01.00-P-0300-01VA
- Pressure gloss marks, smoothings
Individual blank locations, for example in the middle of the cylinder or in the area of the cylinder head bolt.
Reuse crankcase.
- Visible stripes, friction marks
Starting from first piston ring, tapering to an end after about 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.
Reuse crankcase.
- Ring shaped imprints
Visible depressions in the upper and lower reversal range of piston rings, are not a reason for complaint.
Reuse crankcase.
- Rotary bright, reflecting, polished upper surfaces of cylinder
Usually starting from the first piston ring, in the upper area of cylinder, with a measurable partial cylinder wear.
Cylinder wall unusable.
- Roughened streaks, rubbing seizures
Starting from the first and second piston ring, tapering to an end only in bottom part of cylinder. 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 is unusable.
- Continuous individual traces of scratch
Caused by contamination, e.g. through reverse pulsation of soot particles out of the exhaust.
Reuse crankcase.
- Piston seizure
Cylinder wall usually perceptibly roughened over the entire length. Material deposits and perceptible traces of seizure on cylinder wall and piston skirt.
Cylinder wall unusable.
- Brown coloring of cylinder upper surface.
Oil varnish over large areas of the cylinder contact surface which indicates that the engine was driven at high temperature level. Reuse crankcase provided no impermissible cylinder distortion is present. Oil varnish above the piston ring zone is normal and should not be considered a fault.