Toyota Land Cruiser 1988 Repair Manual page 94

ENGINE MECHANICAL- Cylinder Block
EM-63
16
mm
EM1318
BORING OF CYLINDERS
NOTE:
• Bore all six cylinders for the oversized piston outside
diameter.
• Replace the piston rings with ones to match the over-
sized pistons.
1. SELECT OVERSIZED PISTON
Oversized piston diameter:
0/S 0.50 94.463-94.493 mm
(3.7190- 3.7202
in.)
0/S 1.00 94.963-94.993 mm
(3.7387- 3.7399 in.)
0/S 1.50 95.463-95.493 mm
(3.7584- 3.7596
in.)
2.
CALCULATE AMOUNT TO BORE CYLINDER
(a) Using a micrometer, measure the piston diameter at
a right angle to the piston pin hole center line, 16
mm (0.63 in.) below the skirt bottom edge.
(b) Calculate the amount each cylinder is to be rebored
as follows:
Size to be rebored
=
P
+
C - H
P
=
Piston diameter
C
=
Piston clearance
0.027-0.047
mm
(0.0012- 0.0020
in.)
H
=
Allowance for honing
0.02
mm
(0.0008
in.) or less
3. BORE AND HONE CYLINDERS TO CALCULATED
DIMENSIONS
Maximum honing: 0.02 mm (0.0008 in.)
CAUTION: Excess honing will destroy the fin-
ished roundness.