Boring Of Cylinders; Calculate Dimension To Bore Cylinders - Toyota 3b Repair Manual

ENGINE MECHANICAL
-
itit
in
Dtain
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BORING OF CYLINDERS
HINT:
.
Bore
all four
cylinders
for the
oversized piston outside
diameter.
o
Replace
the piston rings with ones matching the pistons.
1.
SELECT OVERSIZED PISTON
Oversized piston diameter:
CALCULATE DIMENSION TO BORE CYLINDERS
(a)
Using a micrometer, measure the piston diameter at
a
right
angle
to the piston
pin
hole center line,
the
indicated distance from the piston
head.
Distance:
B
49.2O mm (1.937O in.)
38
45.20 mm (1.7795 in.)
118
38.33 mm
(1.5O91 in.)
1413
42.83 mm (1.6862 in.)
(b)
Calculate
the
size each cylinder is
to
be rebored
as
follows:
Size
to be rebored
=
P
+
C
-
H
P =
piston diameter
g =
piston clearance
B
0.145
-
0.165 mm
(0.0057
-
0.0065 in')
38
O.19
-
0.21 mm
(O.OO75
-
O.OO83
in.)
118
O.3O -
0.32
mm
(0.01 18
-
0'0126 in.)
148
O.23
-
0.25 mm
(O.OO91
-
O.oO98 in.)
H =
allowance
for
honing
Less
than
O.O2
mm
(O.OOO8
in.)
BORE
AND HONE CYLINDERS TO CALCULATED
DIMENSIONS
Amount of
honing:
0.02 mm
(O.OOOB
in.) maximum
NOTICE:
Excess
honing
will
destroy
the
finished
roundness.
2.
lature.
'it into
mm
(in.)
o/s
B
3B
118 148
0.50
95.345-95.375
(3.7537-3.7549)
102.300-102.330
(4.O276-4.0287l
95.190-95.220
13.7476-3.74881
102.260-102.290
(4.0260-4.0272l.
0.75
95.595-95.625
(3.7636-3.7648)
102.550-
102.580
(4.0374-4.O386)
95.440-95.470
(3.7575-3.7587l.
102.510-102.54C
(4.0358-4.0370)
1.OO
95.845-95.875
(3.7734-3.7746l,
102.800-102.830
(4.U72-4.O48r''l
95.690-95.720
(3.7673-3.7685)
102.760-102.790
(4.U57-4.0/,681
3.