Toyota Supra 1990 Manual page 107

.... Front
ENGINE MECHANICAL - Cylinder Block EM-75
Cylinder Bore Size Mark
(0, 1, 2, 3 or 4)
>
EM5746
EM5745
EM2976
EM2977
HINT: There are five sizes of standard cylinder bore
diameter, marked "0", "1", "2", "3" and "4" accord-
ingly. The mark is stamped on the cylinder block as shown
in the illustration.
Standard cylinder bore diameter:
STD size
Mark "0" 82.990 - 83.000 mm
(3.2673 - 3.2677 in.)
Mark "1" 83.001 - 83.010 mm
(3.2677 - 3.2681 in.)
Mark "2" 83.011 - 83.020 mm
(3.2681 - 3.2685 in.)
Mark "3" 83.021 - 83.030 mm
(3.2685 - 3.2689 in.)
Mark "4" 83.031 - 83.040 mm
(3.2689 - 3.2693 in.)
Maximum cylinder bore diameter:
STD size 83.24 mm (3.2772 in.)
O/S 0.50 83.74 mm (3.2968 in.)
If the diameter is greater than maximum, rebore all six
cylinders. If necessary, replace the cylinder block.
6. REMOVE CYLINDER RIDGES
If the wear is less than 0.2 mm (0.008 in.), use a ridge
reamer to machine the top of the cylinder.
DISASSEMBLY OF PISTON AND CONNECTING
ROD ASSEMBLIES
(See page EM-63)
1. CHECK FIT BETWEEN PISTON AND PIN
Try to move the piston back and forth on the piston pin.
If any movement is felt, replace the piston and pin as a set.
2. REMOVE PISTON RINGS
(a) Using a piston ring expander, remove the compres-
sion rings.