spark
Plug
The
type spark
plug
provided in your engine is
listed
as medium
in
the spark
plug
heat
range chart - Prestolite 14 L7 or equivalent.
Shank Length 7/16"
Thread
Size 14 MM
Gap Setting .025
Inch
NOU
It
is possible that under unusual conditions, "colder "type spark
plug
may
be required^ Consult your
Authorized
Case
Dealer regarding
the proper type spark
plug
to use for your particular
condition.
The
spark
plug
plays a very important part in the power
fuel
economy and general performance of your engine. The outside of
plug
should be cleaned frequently to prevent shorting of the
plug.
The
spark
plug
should be removed, checked, cleaned and gapped
at the end of every 100 hours of operation.
Removing
It
is important to select the exact size spark
plug
wrench. The
wrong
size or type wrench may
cause
distortion
and insulator break-
age.
Always
use a spark
plug
wrench or a
thin
wall
deep
socket
wrench
of the recommended size.
Thoroughly
clean the spark
plug,
including
the threads.
Check the electrode
gaps
us-
ing
a .025
inch
gauge. A very
slight
drag should be
felt
when
the
gauge
wire
passes
between
the electrodes.
Reset
the
gaps
by bending
the side electrode
only.
Never
touch
the center electrode.
Installing
Install
the spark
plug,
with
a new gasket,
in
the engine and
seat
the
plug
on the gasket,
finger
tight.
Tighten
the
plug
about 3/4 of a
turn
after the
plug
is
seated
firmly
on its
gasket. If a torque wrench is
available,
tighten the
plug
to
27 foot-pounds. This
will
assure
proper seating and
sealing
of the spark
plug.
THIS
TYPE
OF
CRACK
IS
SUALLY
CAUSED
BY
1.
DROPPING PLUG
3.
STRIKING PLUG WITH
WRENCH DURING
INSTALL
ATION
ROUND FEELER GAUGE
WILL
GIVE
A
MORE
ACCURATE READING
Figure
14
24
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