Fig. 1 - Cylinder wear check diagram.
Fig. 3 - Measuring cylinder diameter.
Fig. 4 - Cylinder inside roughening with No.
5.9030.349.0 equipment.
Cylinders
Fig. 2 - Cylinder-to-piston position.
Overall cleaning
After removal, clean the cylinders with water and soda or Diesel
oil; also perform a torough cleaning of the cylinder block parts
forming the oil chamber for cylinder cooling.
Checking cylinders
Examine the cylinder surfaces for scoring, ovalization, taper and
excessive wear.
An acceptable cylinder wear gives the cylinder a light tapered
shape; but if barrel-shape wear is noticed, the cylinder should be
replaced.
Measurements are to be taken on each single cylinder at three
different levels, and also on to planes perpendicular to each other.
If the diameter measured is above the maximum wear limit, the
cylinders should be replaced.
Whenever the piston rings are replaced because of excessive
wear, also inspect the cylinder internal surface; if this is completely
smooth, cylinder reboring will be necessary to permit the new
piston rings to be properly bedded. Use the special tool to perform
a swift to-and-fro movement along the cylinder internal wall in
order to score the inner cylinder surface as shown in figure 1.
engine
cylinders
12
1
26
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