Which tool arrangement is appropriate for verifying bearing bore alignment on an engine block?

Which tool arrangement is appropriate for verifying bearing bore alignment on an engine block?

• A. Straight edge and feeler gauges
• B. Telescopic gauge and outside micrometer
• C. Inside micrometer and vernier caliper
• D. Bore gauge

Answer: (A)

Verifying bearing bore alignment is about checking that the bores sit true in relation to each other and run straight in the block. The straight edge provides a fixed reference plane across the bore openings, and the feeler gauges measure any gaps between that reference and the bore surfaces. By placing the straight edge along the bore faces and running feeler gauges in at multiple positions around the circumference and along the bore, you can detect warping, twisting, or out-of-round conditions. If the straight edge sits with uniform, small gaps around the bore, alignment is acceptable; if gaps vary or are larger in certain areas, the bore is misaligned. Other tools focus on sizing the bore rather than checking its positioning. Telescopic gauges and outside micrometers measure diameter and are used to determine bore size, not how the bore lines up with the block. Inside micrometers with a vernier caliper similarly target bore size, not alignment, and a bore gauge is also for measuring diameter. For alignment checks, a straight edge with feeler gauges gives the direct assessment of straightness and relative bore positioning.

Verifying bearing bore alignment is about checking that the bores sit true in relation to each other and run straight in the block. The straight edge provides a fixed reference plane across the bore openings, and the feeler gauges measure any gaps between that reference and the bore surfaces. By placing the straight edge along the bore faces and running feeler gauges in at multiple positions around the circumference and along the bore, you can detect warping, twisting, or out-of-round conditions. If the straight edge sits with uniform, small gaps around the bore, alignment is acceptable; if gaps vary or are larger in certain areas, the bore is misaligned.

Other tools focus on sizing the bore rather than checking its positioning. Telescopic gauges and outside micrometers measure diameter and are used to determine bore size, not how the bore lines up with the block. Inside micrometers with a vernier caliper similarly target bore size, not alignment, and a bore gauge is also for measuring diameter. For alignment checks, a straight edge with feeler gauges gives the direct assessment of straightness and relative bore positioning.