Volvo Penta 300 Series, Руководство по ремонту

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Cylinder liner, inspection and
measurement
Inspection
The cylinder liner should be thoroughly cleaned before
inspection and measuring. The cylinder liner must be
removed from the cylinder block in order to carry out
a proper crack check.
IMPORTANT! The cylinder liner position and
cylinder number must be marked up with a felt
tip pen before the lining is removed.
NOTE! The cylinder liner should not be removed un-
less it is proved necessary, by measuring or an-
other method, to replace it, hone it or check it for
cracks.
The magnaflux method can be used for the crack
check.
Measuring
1
Measure cylinder liner wear with a cylinder indica-tor.
The cylinder indicator should first be set with a pat-
tern ring or a micrometer so that the wear is mea-
sured as precisely as possible.
Use the cylinder liner original diameter as a starting
point.
2
Measure the cylinder liner at the end of travel of the
top piston ring, and at several places along its travel.
At each measurement point, measurements should be
done along and across the length of the engine.
Repair Instructions
Cylinder block, reconditioning
Cylinder block, inspection
Clean the cylinder block thoroughly and check bear-
ing position, connecting rods and cap for damage.
Check that all the channels are free of deposits and
that the block does not have any cracks. Smaller
crack build up can be repaired by sweat welding. If
the welding is carried on the upper surface the cyl-
inder block must be ground flat. In case of larger de-
fects the cylinder block must be replaced.
The cylinder block is available as a replacement part
without the plugs installed in order to facilitate clean-
ing the lengthwise oilways.
NOTE! It is important that the plugs (P/N 955083-1)
are installed again after the cleaning is carried out.
Cylinder block, surface grinding
If the cylinder block requires surface grinding it must
not go below the minimum measurement “C”. See
Workshop Manual “Technical Data”.
NOTE! After grinding the upper block surface, piston
height above the cylinder block must be checked. See
Workshop Manual “Technical Data”.