GENE
RA
L INFORMATION 17
interpreted, can indicate general ring a
nd
valve a
condition. Th
ey
are available from
mOlOrcycle
or
aulO
supply stores and mail order outlelS.
MECHANI
C'S
TIPS
Rem
ovi
ng Frozen Nuts and Screws
When a faslener rusts and cannot
be
removed,
several methods
ma
y
be
used to loosen it. First.
apply penetrating oil such
as
Liquid
Wr
ench
or
WD-40
(av
ailable al any hardware
or
aUlo
supply
store). Apply
it
liberally and lei
it
penetrale for
10-15
minutes. Rap the fastener sever
al
times with
a small hammer: do
not
hit
it
hard enough
to
cause
damage. Reapply the penetrating oil if necessar
y.
For frozen screws. apply penetrating oil as de-
scribed, then
in
se
rt
a screwdriver
in
the s
lOi
and
rap the top
of
the screwdriver with a hammer. This
loosens the
ru
st so Ihe screw can
be
removed in
the normal
way.
If the screw head is too chewed
up
to
use a sc rewdriver. grip the head with Vise
Grip pliers and twist the screw out.
Remedying S
trip
ped
Thre
ads
Occasionally, threads are
st
ripped through
carelessness
or
impact damage. Orten the threads
can be cleaned up
by
running a tap (for internal
th
reads on nuts) or die (for external threads on
bolts) through the threads (Figure 45).
To
clean
or
repair spark plug threads, a spark plug tap (Fig-
ure 46) can
be
used.
If the internal
th
reads
in
a part are damaged
beyond the use
of
a tap. the damaged threads can
be
replaced with a Heli-Coil.
or
equivalent.
ma
s-
ter
th
read repair pack (
Fi
g
ur
e 47). These
kit
s have
all the necessary
item
s
to
repair a damaged internal
th
read.
®
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