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ENGINE OVERHAUL - Crankshaft and Cylinder Block 11B-69 3. CYLINDER BORING (1) Select the oversized piston to be used using the maximum inner diameter cylinder as a reference. (2) There are two types of oversized pistons (0.50 mm, 1.00 mm), so bore so that the clearance is at the specified value that matches the piston’s outer diameter. The reference points for measuring the piston’s outer diameter are shown in the illustration. (3) Calculate the boring finish dimensions based on the piston outer diameter measurement value. Boring finish dimension = Piston outer diameter + 0.02 to 0.04 mm (clearance with cylinder) - 0.02 mm (honing margin) (4) Bore each cylinder to the boring finish dimensions calculated above. To prevent strain caused by a temperature rise during boring, bore in the order of the No. 2 → No. 4 → No. 1 → No. 3 cylinders. (5) Hone to the final finish dimension (piston outer diameter + clearance with cylinder). (6) Confirm the clearance between the piston and cylinder. Piston outer diameter 11.65 mm |