Cylinder Boring

NOTE:
- Bore all the 6 cylinders for the oversized piston outside diameter.
- Replace all the piston rings with ones to match the oversized pistons.

1. Select oversized pistons.
Oversized piston diameter:
O/S 0.50: 100.450 - 100.480 mm (3.9547 - 3.9559 inch)
O/S 1.00: 100.950 - 100.980 mm (3.9744 - 3.9756 inch)
2. Calculate amount to bore cylinders.





(a) Using a micrometer, measure the piston diameter at right angles to the piston pin center line, 42 mm (1.65 inch) from the piston head.
(b) Calculate the amount of each cylinder is to be rebored as follows:
Size to be rebored = P + C - H
P = Piston diameter.
C = Piston clearance: 0.040 - 0.060 mm (0.0016 - 0.0024 inch)
H = Allowance for honing: 0.02 mm (0.0008 inch) or less
3. Bore and hone cylinder to calculated dimensions.
Maximum honing: 0.02 mm (0.0008 inch)

CAUTION: Excess honing will destroy the finished roundness.