2Shop ToolsQuality tools recommended by the manufacturer should be used when servicing a small gas engine,Makes service easy and effective and prevents damage to partsCommon shop tools includeWrenches Punches HammersPiers ChiselsScrewdrivers - Measuring Instruments
3WrenchesThere are many types of wrenches, and it is important to use the correct tool when faced with a decision of which would be best.Box end, open end, adjustable, and socket type wrenches should be used on hexagon bolts and nutsWhich is better to use if you can encompass the entire bolt head, an open or closed end wrench?
5Identify These Wrenches A.B.C.D.Combination WrenchOpen End WrenchAdjustable Wrench6 Point Socket & Ratchet Handle
6WrenchesAn adjustable wrench should be used as a last resort when other wrenches are not available.Adjustable wrenches are prone to loosening and slipping around the corner of bolts and nutsA torque wrench is used to tighten threaded fasteners to a specific torque setting.Torque is the turning force applied to the fastener
7PliersPliers are useful for gripping, bending, pulling, and cutting wires.THEY SHOULD NOT BE USED IN PLACE OF WRENCHES
9Answer A. B. C. D. Water Pump Pliers Slip Joint Pliers Lineman Pliers Needle Nose Pliers
10ScrewdriversScrewdrivers are available in a variety of shapes and sizes.Standard and phillips varietyThe proper size blade should be used to match the length and thickness of the screw head slotOffset screwdrivers can be used in tight situations.
12Identify These Screwdrivers A.B.C.D.Standard ScrewdriverStubby ScrewdriverOffset ScrewdriverPhillips Screwdriver
13Punches Many types of punches are used for small engine work Center punchHas a point on the end, used to make depression in metal surfaces before drillingPrick punchSame as above, but the point is 60 degrees to leave a small depression prior to using the center punchPin punchUsed to drive pinsDrift punchUsed to align holes in mating parts
15Identify These Punches A.B.C.D.Center PunchDrift PunchPin PunchPrick Punch
16Measuring Instruments High quality measuring instruments should always be used when servicing a small gas engine.Measurements are made to determine if parts are within specific limits or if adjustments are needed.CalipersUsed to measure the diameter or thickness of an objectInside or outsideMicrometersPrecision instrument designed to accuratley measure engine parts
18Identify These Measuring Tools B.C.D.MicrometerOutside CaliperInside CaliperFeeler Gauge
19Parts of a micrometerTo understand how to take a reading from a micrometer, we need to know the parts.AnvilSpindleSleeveFrameThimble
20This is a English micrometer sleevethimbleanvilspindleframe
21Steps to Reading a micrometer Lightly tighten on object.Determine smallest measurement when micrometer is closed.Find largest visible number on sleeve and multiply timesCount number of marks past largest visible number on sleeve and multiply timesMultiply thimble reading timesAdd all numbers to get answer.
22Now, an example...Smallest MeasurementLargest sleeve reading1517161413181918170.000161514130.3000.0250.0160.341 inchesOne mark pastlargest sleevereadingThimble Reading
23Another example... 0 1 2 3 4 Smallest Measurement Largest sleeve reading20191817162423222120153.0000.4000.0750.021Thimble ReadingThree marks past largest sleeve reading3.496 inches
24Review... Lightly tighten on object. Determine smallest measurement when micrometer is closed.Find largest visible number on sleeve and multiply timesCount number of marks past largest visible number on sleeve and multiply timesMultiply thimble reading timesAdd all numbers to get answer.