Boring Of Cylinders; Select Oversized Piston; Calculate Amount To Bore Cylinder; Bore And Hone Cylinders To Calculated Dimensions - Toyota 7M-GE Repair Manual

EM-80 ENGINE MECHANICAL .- Cylinder. Block
BORING OF CYLINDERS
NOTE; .-
l
Bore all six cylinders for the oversized piston. outside
diameter.
l
Replace the piston rings with ones to match, the over-
sized pistons.
1.
2.
3.
SELECT OVERSIZED PISTON
Oversized piston diameter:
O/S, 0.50 7M-GE 83.40 - 83.45 mm
(3.2835 - 3.2854 in.)
7M-GTE 8341.. - 83.46.mm
(3.2839 - 3.2858 in.)
CALCULATE AMOUNT TO BORE CYLINDER
(a) Using a micrometer, measure the piston diameter at a
right angle to the piston pin hole center line, 22 mm
(0.87 in.) from the piston head.
(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
7M-GE 0.08 - 0.10 mm
(0.0020 - 0.0028 in.1
7M-GTE 0.07 - 0.09 mm
(0.0028 - 0.0035 in.)
H = Allowance for honing
0.02 mm (0.0008 in.) or less
BORE AND HONE CYLINDERS TO CALCULATED
DIMENSIONS
Maximum honing: 0.02 mm (0.0008 in.)
CAUTION: Excess honing will destroy the finished
roundness.