Note:
- - Ream all cylinders to the same oversize (for pistons of repair diameter).
- - Install piston rings of the same repair size, corresponding to the repair size of the pistons.
1. Select pistons of repair size.
Repair (0.50) piston diameter:
2C - 86.445 - 86.475 mm
3S-FE — 86.425-86.455 mm
4S-FE
- rem. (0.50) — 82.937 - 82.967 mm
- rem. (0.75) — 83.187 - 83.217 mm
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4A-FE, 7A-FE - 81.430 - 81.460 mm
5A-FE — 791130-79.160 mm
2. Calculate the repair size for boring the cylinders.
a) Using a micrometer, measure the piston skirt diameter at a distance of 25.4 mm (3S-FE); 26.0 mm (4S-FE); 24.5 mm (4A-FE, 5A-FE, 7A-FE); 64.5 mm (20): from the piston bottom surface (below the piston ring groove level) and in the direction perpendicular to the axis of the piston pin, as shown in the figure.
b) Calculate the diameter of the cylinder for boring.
The size to which the cylinder needs to be bored = P + C - H
P = piston diameter, mm
C = piston oil clearance
- 2C - 0.045-0.065 mm
- 3S-FE — 0.120-0.140 mm
- 4S-FE — 0.053 - 0.073 mm
- 4A-FE, 5A-FE, 7A-FE - 0.085-0.105 mm
H = honing allowance - 0.02 mm or less
3. Bore and hone the cylinder to the required dimensions.
- Maximum honing tolerance is 0.02 mm