Volvo Penta 300 Series, Руководство по ремонту, Страница: 62 / 96

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Repair Instructions
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If the wear is greater than 0.25–0.30 mm the cylinder
liner with piston and piston rings should be replaced.
NOTE! The piston and cylinder liner are supplied as
replacements parts only as a complete cylinder lin-
er kit. The pistons and liners are classed and
marked with a letter. C, D or E. This means that a
piston marked E may only be mounted in an E
marked liner.
Class Cylinder bore
C 92.00–92.01 mm
D 92.01–92.02 mm
E 92.02–92.03 mm
Cylinder liner, honing
Honing pattern in cylinder liner
It is important that the cylinder liner retains the old
honing pattern for good lubrication and sealing char-
acteristics. The liner should therefore be honed if
there are ring scratches, deposits or polished areas.
It is not recommended that honing is carried out with
the cylinder liner in position because pollutants may
fall into the oilways and the difficulties in measuring
accurately.
The cylinder liners have a honing pattern (see illus-
tration) the angles of which are calculated to give op-
timal lifetime. When honing in conjunction with piston
ring replacement the original pattern must be followed
to retain the lubricating function.
The honing lines must be regularly formed and evenly
cut in both directions, over the whole surface.
NOTE! The correct speed must be held on the honing
tool in order to obtain the correct pattern.
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Clean any carbon deposits off the removed cylinder
liner. Fix the cylinder liner in a vice, use jaw pads to
avoid damage.
Use a powerful drill which can operate at low speed,
200–400 rpm.
Use a Flex-Hone® tool, type GB95.
NOTE! Do not use a honing tool with grindstones as
these damage the whole liner surface.
Lubricate the liner with thin engine oil before and
during honing.
IMPORTANT! After honing, it is very important
that the liner should be carefully cleaned. Use
hot water, a brush and detergent (never paraffin
(kerosene) or diesel oil). Finish off by wiping
with oiled cotton rags, which are changed until
they are no longer discolored. Oil the liner with
thin engine oil after drying.
Flex-Hone® is a registered trademark of Brush Research Man-
ufacturing Co., Inc.