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CYLINDER BLOCK
Boring Cylinder
1.
Oversize pistons to be used should be determined on the
basic of the largest bore cylinder.
~_-::::::::P::is::;;to::;;n::;;O::.D::·::::::::-_--JThrust
direction
0.25
0.50
0.75
1.00
Identification mark
Size
0.25
mm
(0.010
in.) O.S
0.50
mm
(0.020
in.) O.S
0.75
mm
(0.030
in.) O.S
1.00
mm
(0.039
in.) O.S
NOTE
Size mark is stamped on top of piston.
2.
Measure outside diameter of spring to be used.
3.
Based on measured piston 0.0.• calculate boring finish
dimension.
Boring finish dimension
=
Piston 0.0
+0.01-0.03
mm
(0.0004-0.0012
in.) (clearance between 0.0. and cylinder)
- 0.02
mm
(0.008
in.) (honing margin.)
4.
Hone each of the cylinders to the calculated size.
CAUTION
To prevent distortion that may result from temperature
rise during honing, bore cylinders, working from No.2 to
. No.4 to No.1 to No.3.
5.
Hone the cylinders. finishing them to the proper dimension
(piston outside diameter
+
gap with cylinder).
6.
Check clearance between piston and cylinder.
NOTE
When boring cylinders,finish all of four cylinders to same
oversize. Do not bore only one cylinder to an oversize.
REASSEMBLY
Y200COA
1.
Install the following parts by referring to the respective par-
agraphs.
1) Crankshaft
2)
Flywheel
3)
Piston
4) Cylinder head
5) Timing belt train
6)
Front case
20-68
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