Figure 2-8.—Locations for taking crankshaft deflectionreadings.Most borescopes have the following basiccomponents:1. Eyepiece (zoom or wide angle)2. Scan control ring3. Probe tube4. Scan mirror5. Quartz-lined lamp6. Focus control ring7. Other electrical accessoriesAs with any optical instrument, you should handlethe borescope with care to avoid damaging its lenses andmirrors. The borescope is powered by alternatingcurrent. So, before you first use it, be sure to read andfollow the manufacturer’s operating instructions. Theborescope can be inserted through any engine opening,such as a cylinder port, to identify problems, such ascracked pistons, cracks in the cylinder head, burnedvalves, and scuffed or pitted liners. You can remove thecrankcase cover to inspect the bottom section of theengine.STROBOSCOPEA stroboscope is a flashing light source used tomeasure the speed of fast-moving objects. it producesthe optical effect of stopping or slowing down an objectto allow you to observe and analyze the object’s motion.Figure 2-10 shows a typical stroboscope.A stroboscope consists of a power switch, rpmcontrol dial, range switch, calibration indicator light,calibration screws, combination adjustments, reflectorlamp assembly, and other electrical accessories. Forinformation about the functions of the components,consult the operator’s manual.Before you use the stroboscope, be sure to read andfollow the manufacturer’s operating instructions. Theinstrument commonly operates from a 120-volt, 60-Hz,alternating current supply. Any change in currentfrequency will affect the flashing speed and affect thestroboscope’s accuracy for speed measurements. Thestroboscope can be used to measure the speed and toobserve the motion of rotating, reciprocating, orvibrating mechanisms. Never leave the stroboscopeunattended while it is in use. Since the stroboscopemakes a moving object appear to be standing still,someone could be seriously injured by the apparently“stationary” object.TORQUE WRENCHThe torque wrench is used to measure an object’sresistance to turning and to provide precise tighteningFigure 2-9.—Typical borescope.2-6
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