TM 5-4310-451-14
5-17. ENGINE BLOCK REPAIR (Con’t).
7.
Set dial scale to zero (0), then turn dial clockwise to read 8. Take measurements at positions B, C, D, E, and F of
cylinc from zero (0) mark on gage.
9.
Out-of-round or taper must not be greater than 0.002 in.
10.
Measure diameter of counterbores (21). Reading must be 5.046-5.051 in. (128.168-128.295 mm).
11.
Measure depth of counterbores (21). Reading must be 0.477-0.495 in. (12.116-12.573 mm). If counterbore
varies more than 0.0015 in. (0.0381mm) around edge of cylinder, engine block must be replaced.
12.
No two adjacent counterbores may vary more than 0.001 in. (0.025 mm) when measured along cylinder
centerline.
5-27
