21-3 Cylinder Liner, Pistons
Cylinder Liner and Pistons,
Inspection
Clean the cylinder liners carefully before inspec-
tion and measurement.
IMPORTANT!
Cylinder liners and pistons are classed together. This
means that cylinders and liners must not be mixed.
The piston and cylinder liner sets are only available as
a single, complete unit.
Cylinder Liner
Measurement of cylinder liner wear can be done with
the liner installed in the cylinder block.
NOTICE!
The cylinder liners must be taken out of the
engine block, to do a careful crack check.
1
Measure the cylinder liners with a cylinder indi-
cator. In order to obtain the greatest possible
accuracy in the wear measurement, the cylinder
liner must first be set up with a gauge ring or
micrometer. Use the original diameter of the cyl-
inder liner as the base value.
2
Measure the cylinder liner at top and bottom dead
centers, and at several places vertically.
At each measurement location, measurement
must be lengthwise and crosswise in relation to
the engine.
3
If wear is greater than 0.45–0.50 mm, a new com-
plete lining kit must be used (piston, liner, piston
rings, piston pin and seals).
Oil consumption also affects when cylinder liners
must be changed.
4
Remove the cylinder liner and do a crack check.
Be specially careful when checking the liner col-
lars.
The Magnaflux method may be used for this
check.
Pistons
5
Check for worn piston ring grooves, damaged
retainer ring grooves, cracks and other damage
to the pistons.
If the piston has deep scratches on its skirt, the
piston (liner kit) must be scrapped. The same
applies if the piston has one or more cracks in the
piston pin hole or in the bottom of the combustion
chamber.
Crack tests must be done using the chalk powder
method.
P0006962
21-3 Cylinder Liner, Pistons
7748841 06-2010
175
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