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Difficulty: HardPrecision Measurement Instruments

An automotive technician is performing critical tolerance checks during an engine and chassis overhaul. Match each precision measurement instrument on the left to its most appropriate automotive inspection task on the right.

  • Dial IndicatorMeasuring lateral runout on a brake rotor surface while rotated on a hub
  • Feeler GaugeChecking valve lash clearance between a camshaft lobe and mechanical lifter
  • Telescoping GaugeTransferring an internal cylinder bore diameter to an outside micrometer
  • Depth MicrometerMeasuring cylinder liner protrusion height above the cylinder block deck surface

Answer

Dial Indicator matches Measuring lateral runout on a brake rotor surface; Feeler Gauge matches Checking valve lash clearance; Telescoping Gauge matches Transferring an internal cylinder bore diameter; Depth Micrometer matches Measuring cylinder liner protrusion height.
Each instrument is engineered for a specific geometric inspection mode: dial indicators track surface variance and runout during rotation; feeler gauges gauge precise physical air gaps between mating parts; telescoping gauges expand inside internal bores to capture internal diameters for outside micrometer verification; depth micrometers utilize a wide reference base to measure stepped depths and component protrusions.

Step-by-Step Solution

1
Analyze the mechanical motion and measurement type for each automotive inspection task.
Identify tasks requiring continuous surface deflection tracking, narrow clearance measurement, internal dimension transfer, and stepped flat-plane depth measurement.
Matching precision instruments requires pairing the geometric constraint of the part with the design capability of the tool.
2
Pair continuous rotational deflection with the contact plunger instrument.
The dial indicator is matched to brake rotor lateral runout.
The dial indicator's needle translates continuous microscopic plunger displacement into direct thousandths of an inch or hundredths of a millimeter.
3
Pair narrow clearance insertion with calibrated flexible steel leaves.
The feeler gauge is matched to valve lash clearance.
Calibrated thickness strips can slide between closely spaced flat or curved surfaces to evaluate clearance by tactile drag.
4
Pair internal bore geometry with the expanding indirect transfer gauge.
The telescoping gauge is matched to transferring cylinder bore diameter.
Telescoping gauges enter deep engine bores, expand to contact opposing cylinder walls, lock rigid, and transfer the size to an outside micrometer.
5
Pair reference deck protrusion measurement with the flat-base micrometer.
The depth micrometer is matched to cylinder liner protrusion height.
The flat base rests securely across the cylinder block deck while the extension rod measures the step height to the top of the liner flange.

Key Concept

Precision Measurement Instrument Selection and Application
Estimated Time:1m 30s
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Topics

Precision Measurement Instruments

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