| 摘要 |
A method and apparatus (50) for forming counterbores (30) (32) in a selected cylinder borehole (12) in an engine block (11) by aligning and securing the column (51) of a boring machine (50) relative to both the longitudinal axis (20) of a given cylinder borehole (12) and the center (21) of the engine crankshaft (70) and then lowering the boring machine spindle (54) into the selected cylinder borehole (12) to form the counterbores (30) and (32).
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