Which of the following tools is recommended for checking cylinder block line bore?

The recommended tool for checking cylinder block line bore is a master line bore bar. This tool is specifically designed to measure the alignment and diameter of the bored holes in a cylinder block, providing precise measurements that are critical for ensuring engine performance. The master line bore bar allows for the accurate assessment of whether the alignment meets the manufacturer’s specifications, which is essential for optimal engine operation.

Using a master line bore bar ensures that any variances in the cylinder block are detected and addressed. This tool typically features a rigid construction and can measure in various configurations, ensuring versatility in different engine applications. Its design allows for reliable readings, making it a preferred choice over other tools that may not offer the same level of precision needed for line boring checks.

Other tools listed, such as a straightedge and thickness gauges or a dial indicator, may be useful for different types of measurements within engine construction, but they are not specifically suited for the precise alignment checks that the master line bore bar excels at. Dial bore gauges are excellent for measuring the diameter of holes but do not provide the same comprehensive assessment for alignment as a master line bore bar does.