Westerbeke W-46 - Cylinder Sleeves Inspection

INSPECTION/REPAIR
Cylinder Sleeves
1. Using a cylinder gauge, t~ke ID
measurements in two ,directions
(parallel and transverse to the
crankshaft axis} on each
cylinder sleeve at the three
locations indicated below.
If wear reaches the repair
limit, rebore the sleeve to the
next specified oversize.
Specifications
Unit: mm (in.)
Item
Standard
Repair
Service
limit
limit
84 +0.035
0
+0.20
0.7
Cylinder sleeve ID
(3.307~.00138)
(+0.008)
(0.028)
Out of
Q.ot5
roundness
(0.00059),
max
0.05
Taper
(0.0020),
max
2. Two oversizes are provided
for: +0.25 and +0.5 mm(0.00984
and 0.01969 in.). After
rebor ing, be sure to hone the
bore to the specified oversize
accurately within plus 0.035mm
(0.00138·in.) or minus 0 mm.
Machining the bores of all four
sleeves to the same oversize is
recommended (Pistons and piston
rings are available for the two
oversizes).
3. If any sleeve bore is unevenly
worn, determine the oversize
which the sleeve' is to be
rebored on the basis of the
maximum wear noted. This will
ensure perfect roundness in the
oversize bore.
. NOTE: Cylinder sleeve installed must be flush with,
·the block
surface.
Crankcase gasketed surface
I
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1
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2
:
3
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Positions for checking sleeve bore diameter
Removing ridge with ridge reamer
(NOTE: If the cylinder sleeves are found in good condition.
with the wear far less than the repair limit, it 1s per-
missible to rebuild the engine with replacement-piston rings.
In these cases, be sure to ream off the ridge and, as
necessary, hone the bore to remove any glossy surface.)
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