Toyota 1C Repair Manual page 88

EM-82
ENGINE MECHANICAL - Cylinder Block
EB
(D
Thrust
Direct10n
®
Axial
Direction
15
mm
(0.59
in.)
Middle
15
mm
(0 .59
inJ ...,,.,
BORING OF CYLINDERS
1. SELECT OVERSIZED PISTON
If using a 0/S piston, bore all cylinders for the 0/S piston
outside diameter.
NOTE: If oversized pistons are used, the rings must also
be oversized .
Oversize piston diameter {0/S 0.50):
1C series 83.45 - 83.48 mm (3.2854 - 3.2868 in.)
2C series 86.45 - 86.48 mm (3.4035 - 3.4047 in .)
2. CALCULATE DIMENSION TO BORE CYLINDERS
la)
Using a micrometer, measure the piston diameter at
right angles to the piston pin center line, 18 mm
(0. 71 in.) below the piston pin center line.
(b) Calculate the size each cylinder is to be rebored as
follows :
Size to be rebored
=
P
+
C - H
P
=
Piston diameter
C
=
Piston clearance
0.04 - 0.06 mm (0.001 6 - 0 .0024 in.)
H
=
Allowance for honing
less than 0.02 mm {0.0008 in.I
3. BORE AND HONE CYLINDERS TO CALCULATED
DIMENSIONS
Maximum honing: 0.02 mm (0.0008 in.)
CAUTION: Excess honing will destroy the finished
roundness.
4 . INSPECT CYLINDER BORE DIAMETER
(a) The difference between A, B and C measurements is
greater than the taper limit. ·
Taper limit: 0.01 mm (0.0004 in.}
(bl The difference between the thrust and axial measure-
ments is greater than the out-of-round limit.
Out-of-round limit: 0 .006 mm (0.0002 in.)