Yanmar 1GM User Manual page 18

G ENERAL INFO RMATI ON
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wi ll accept either type); this can damage the head so that
the proper tool will be unab le to remo ve it.
8. Keep screwdrivers in the proper condition, and they
will last longer and per
form
better. Always keep the tip of
a standard screwdriver in good condition. Figure 19
shows how to grind the tip to the proper shape if it be-
comes damaged. Note the symmetrical sides of the tip.
Plie rs
Identify them by painting the screwdriver
shank underneath the handle.
4. When selecting screwdrivers, note that more power
can be applied with less effort with a longer screwdriver
than with a short one. Of course, there will be situations
where only a short handle screwd river can be used. Keep
this in mind though, when tryi ng to remove tight screws.
5. Because the working end of a screwdriver receives
quite a bit of abuse, you shoul d purchase screwdrivers
with hardened tips . The extra money will be well spent.
6. Screwdrivers are available in sets, which ofte n include
an assortment of common an d Ph illips blades. If purchas-
ing them individually, buy at least the following:
a. Common screwdriver-5/16 x 6 in. blade.
b. Common screwdriver-3/8 x 12 in. blade.
c. Phillips screwdriver-size 2 tip. 6 in. blade.
d. Phillips screwdriver-size 3 tip. 6 and 8 in. blade.
7. Use screwdrivers only for driv ing screws. Never usc a
screwdriver for prying or chisel ing metal. Do not
try
to rc-
move a Phillips , Torx or Allen head screw with a standard
screwdriver (unless the screw has a combination head that
Pliers come in a wide range of types and sizes . Pliers are
useful for cutting, bending and crimping. They should
never be used to cut hardened objects or to turn bolts or
nuts . figure 20 shows several types of pliers .
Each type of pliers has a specialized function. Combi-
nation plie rs are general-purpose pliers and are used
mainly for holding and for bend ing. Necdlenose pliers are
used to hold or bend small objects. Adj ustable pliers
(commonly referred to as channel locks) can be adjusted
to hold various sizes of objects; the ja ws rema in parallel to
grip around objects such as pipe or tubing.
Lock ing Pliers
Locking pliers (Figu re 21) are used to hold objects veIY
tightly while another task is performed on the obje ct.
Locking pliers are available in many types for more spe-
cific tasks.
Ci rc lip Pliers
Circlip pliers (Figure 22) are used to remove circlips
from shafts or within engine or suspension housings.
When purchasing circlip pliers, there are two types . Exter-
nal pliers (spreading) are used to remove circ lips that fit
on the outside of a shaft . Internal pliers (squeezing) are
used to remove circlips that fit inside a housing.
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