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CYLINDER BLOCK
3.
If cylinder bores show more than specified out-of-round or
taper, or if cylinder walls are badly scuffed or scored, cylinder
block should be rebored and honed, and new oversize piston
and rings are fitted.
Standard value
Cylinder bore
.
86.49-86.53
mm
(3.4051-3.4067
in.)
Out-of-roundness and taper of cylinder bore
.
Max.
0.01
mm
(0.0004
in.)
4.
If cylinder top ridge is worn in stages, cut away with ridge
reamer.
5.
Oversize pistons are available in four sizes.
Piston service size and mark mm (in.)
0.25 (0.010)
O.S
0.25
0.50 (0.020)
O.S
0.50
0.75 (0.030)
O.S
0.75
1.00 (0.039)
O.S
1.00
6.
To rebore the cylinder to oversize, keep the specified
clearance between the oversize piston and the bore, and
make sure that all pistons used are of the same oversize.
The standard measurement of the piston outside diameter is
taken at a level
2
mm
(0.08
in.) above the bottom of the
piston skirt and across the thrust faces.
Piston-to-cylinder wall clearance
.
0.01-0.03
mm
(0.0004-0.0012
in.)
7.
Check for damage and cracks.
8.
Check top surface for flatness. If excessive flatness is evi-
dent, grind to minimum limit or replace
Standard value
Flatness of gasket surtace
.
Max.
0.05
mm
(0.0020
in.)
Overall height.
290
mm
(11.4
in.)
Service limit
Flatness of gasket surface
0.1
mm
(0.0039
in.)
Overall height
-0.2
mm
(-0.0079
in.)
CAUTION
The cylinder block gasket surface should be ground to
within -0.2 mm (-0.0079 in.) even with the grind of cyl·
inder head gasket surface.
20-67
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