Date post: | 10-Dec-2015 |
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SHOP TOOLS
Quality tools recommended by the manufacturer should be used when servicing a small gas engine, Makes service easy and effective and prevents
damage to parts Common shop tools include
Wrenches - Punches - Hammers Piers - Chisels Screwdrivers - Measuring Instruments
WRENCHES
There 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 nuts
Which is better to use if you can encompass the entire bolt head, an open or closed end wrench?
IDENTIFY THESE WRENCHES
D.A. B. C.
Combination Wrench
Open End Wrench
Adjustable Wrench
6 Point Socket & Ratchet Handle
WRENCHES
An 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 nuts A torque wrench is used to tighten threaded
fasteners to a specific torque setting. Torque is the turning force applied to the fastener
PLIERS
Pliers are useful for gripping, bending, pulling, and cutting wires.
THEY SHOULD NOT BE USED IN PLACE OF WRENCHES
SCREWDRIVERS
Screwdrivers are available in a variety of shapes and sizes. Standard and phillips variety
The proper size blade should be used to match the length and thickness of the screw head slot
Offset screwdrivers can be used in tight situations.
IDENTIFY THESE SCREWDRIVERS
A. B. C. D.
Standard Screwdriver
Stubby Screwdriver
Offset Screwdriver
Phillips Screwdriver
PUNCHES Many types of punches are used for small engine
work Center punch
Has a point on the end, used to make depression in metal surfaces before drilling
Prick punch Same as above, but the point is 60 degrees to leave a
small depression prior to using the center punch Pin punch
Used to drive pins Drift punch
Used to align holes in mating parts
MEASURING 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. Calipers
Used to measure the diameter or thickness of an object Inside or outside
Micrometers Precision instrument designed to accuratley measure
engine parts
PARTS OF A MICROMETER
To understand how to take a reading from a micrometer, we need to know the parts. Anvil Spindle Sleeve Frame Thimble
STEPS TO READING A MICROMETER
Lightly tighten on object. Determine smallest measurement when
micrometer is closed. Find largest visible number on sleeve
and multiply times 0.100. Count number of marks past largest
visible number on sleeve and multiply times 0.025.
Multiply thimble reading times 0.001. Add all numbers to get answer.
0 1 2 3 4 5 6 7 8 9
15161718
14 13
19
15
1716
1413
1815
0 1 2 3
Smallest Measurement
0.000
Largest sleeve reading
0.300
NOW, AN EXAMPLE...
One mark pastlargest sleevereading
0.025
Thimble Reading
0.016
0.341 inches
20
15
0 1 2 3 4
2019181716
24232221
0
Smallest Measurement Largest sleeve reading
Three marks past largest sleeve reading
Thimble Reading
3.000
0.400
0.075
0.021
3.496 inches
Another example...
REVIEW...
Lightly tighten on object. Determine smallest measurement when
micrometer is closed. Find largest visible number on sleeve
and multiply times 0.100. Count number of marks past largest
visible number on sleeve and multiply times 0.025.
Multiply thimble reading times 0.001. Add all numbers to get answer.