If the crankshaft runout readings on the dial indicator are plus .002 inch and minus .003 inch, the runout is

If the crankshaft runout readings on the dial indicator are plus .002 inch and minus .003 inch, the runout is

• A. .002
• B. .003
• C. .005
• D. .007

Answer: (C)

Measuring crankshaft runout with a dial indicator assesses how far the shaft wobbles during rotation. The total indicator runout (TIR) is the difference between the highest and lowest readings observed in one full rotation. Here, the readings are +0.002 inch and -0.003 inch. The highest is +0.002 and the lowest is -0.003, so the runout is 0.002 - (-0.003) = 0.005 inches. So the crankshaft runout is 0.005 inches.

Measuring crankshaft runout with a dial indicator assesses how far the shaft wobbles during rotation. The total indicator runout (TIR) is the difference between the highest and lowest readings observed in one full rotation. Here, the readings are +0.002 inch and -0.003 inch. The highest is +0.002 and the lowest is -0.003, so the runout is 0.002 - (-0.003) = 0.005 inches. So the crankshaft runout is 0.005 inches.