CYLINDER
BLOCK
SERVICE
2. Check the water jacket for scale and corrosion. Clean the
block thoroughly and ensure that all oil passages are
clean.
3. Check the cylinder walls for scratches, dents and wear. If
necessary, repair by honing
or
boring. Measure the cylin-
der bore
in
right-angled directions A and B at three dif-
ferent depths.
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FRONT
CHECKING
CYUNDER
WEAR
4. When cylinder bore wear is not excessive and only the
piston rings require replacement, check the upper part
of
the cylinder for ridge wear.
If
any exists, ream the cylin-
der bore and hone when necessary.
Piston,
Piston
Pin
and
Piston
Rings
1.
Check the piston for seizing, scratches and wear. If nec-
essary, replace the piston.
2. Measure the piston
O.D. Replace the piston if exces-
sively worn.
If
the piston-to-cylinder clearance is exces-
sively large, machine the cylinder to an oversize bore or
replace the piston. The piston
O.D. should be measured
at the lower end
of
the skirt at right angles to the axis
of
the piston pin hole.
MEASURING
PISTON
0.0.
3. Measure the side clearance between each piston ring and
its groove. If necessary, replace the ring.
As to the semi-keystone type top ring, allow
it
to sink by
its own weight into the groove, then measure its depth
from the piston surface.
PISTON
RING
SIDE
CLEARANCE
WEIGHT
OF
RING
4. Measure the gap
of
each piston ring. Replace the ring if
its gap is excessively large. To measure the ring gap,
insert a ring into the least worn place
of
the cylinder bore
(skirt) using a piston and measure the gap with a feeler
gauge.
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JL:HG
.
RING
GAP
Engines & Generators
24
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