16
Magnetic
Stand
A magnetic stand (F tgu re
af)
is used to hold a dial indi-
cator securely when checking the runout
of
a round object
or when checking the end play
of
a shaft.
V-bloc ks
V-blocks (Fig
ure
42) are precision-ground blocks used
to hold a round object when checking its runout or condi-
tion.
Surface Plate
A surface plate can be
used
to check the flatness
of
parts
or to
prov
ide a perfectly flat surface for
minor
resurfacing
of
cylinder head or other critical gasket surfaces. While
industrial quality surface plates are quite expensive, the
home
mec
hanic can improvise. A thick metal plate can be
used as a surface plate. The surface plate s
how
n in Figure
43 has a piece
of
sandpaper glued to its surface that is used
for cleaning and smoothing machined surfaces, such as
the cylinder head.
NOTE
A local machine shop can fabricate a sur-
face plate.
Expendable Supplies
Certain expendable supplies are also required. These
include grease, oil, gasket cement, shop rags and cleaning
solvent. Ask the dealer for the special locking com-
pounds, silicone lubricants and lubricants that make vehi-
cle maintenance simpler and easier.
WARNING
Having a stack
of
clean shop rags on hand is
important when performing engine work.
However;
to prevent the possibility
of
fire,
store solvent-soaked rags in a sealed metal
container until they can be washed or dis-
carded.
NOT
E
To
avoid absorbing solventand other chem-
icals into the skin while cleaning parts,
wear a pair
ofpetroleum-resistant rubber
gloves. These can he purchased through
in-
dustrial supply houses or well-equipped
hardware stores.
CHAPTER
ONE
1\1ECHANIC'S TIPS
Removing
Fr
ozen Nuts
and
Screws
When a fastener rusts and cannot be removed, several
methods may be used to loosen it. First, apply penetrating
oil such as Liquid Wrench or WD-40. Apply it liberally
and let it penetrate for 10-15 minutes. Rap .thc fastener
several times with a small hammer; do not hit it hard
enough to cause damage. Reapply the penetrating oil if
necessary.
For frozen screws, apply penetrating oil as described,
then insert a screwdriver in the slot and rap the top of the
screwdriver with a hammer. This loosens the rust so the
screw can be removed in the normal way. If the screw
head istoo damaged to use this method, grip the head with
locking pliers and twist the screw out.
Avoid applying heat unless specifically instructed, as it
may melt, warp or remove the temper from parts.
Removing Br
oke
n Screws
or
Bolts
lf
thc head breaks
off
a screw or bolt, several methods
arc available for removing the remaining portion.
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