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To measure the diameter of a cylinder using a dial bore gauge, use the following steps as a general guideline:
STEP 1
Using a ring gauge (made to the same precise size of the cylinder bore diameter) or an outside micrometer, zero the dial gauge inside the spindle-anvil of the micrometer or ring gauge. To do this, turn the outer ring or bezel of the dial gauge to align the zero graduation with the stable pointer position.
STEP 2
After zeroing the gauge, move it to the cylinder and tilt the gauge to place it inside the cylinder bore.
STEP 3
Rock the lever of the bore gauge back and forth, sweeping the gauge through a perpendicular position inside the cylinder. When the handle is at exactly 90 degrees to the cylinder, the dial gauge plunger will record the narrowest dimension of the cylinder due to the plunger’s orientation with the cylinder walls.
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STEP 4
When rocking the gauge, observe and record how far the dial plunger is either pushed into the gauge (a negative reading relative to the zero position) or how far the plunger moves past the zero position (a positive reading).
STEP 5
Take measurements in two places, 90 degrees apart, at the top, middle, and bottom of the cylinder where the piston has traveled.
STEP 6
Include separate measurements near the top of the cylinder above the uppermost area of piston ring travel (but not on the cylinder ridge of a worn engine). Measure the area near the bottom of the cylinder, below the lowermost point of ring travel.
STEP 7
Record all observations and analyze the results to determine the amount of taper, belled shape, and barrel wear of the cylinder concentricity. Compare measurements with specifications and make service recommendations.
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