ENGINE
ADJUSTMENTS
SPARK
PLUGS
The spark
plugs
should be cleaned
and
re-gapped after the
first
50 hour break-in period, then inspected
every
250
hours
thereafter
and
replaced
as
needed.
A
WARNING:
Do
not
remove
the
spark
plugs
while
the
engine
is
hot.
Allow
the
engine
to
cool
before
removing
them.
SPARK
PLUG
GAP:
D.032
-
0.035in.
(0.8
-
0.9mm).
SPARK
PLUG
TORQUE:
11
-15
lb-ft
(15
-
26
Nm).
NOTE:
Loctite
Anti-Seize applied
to
the
threaded
portion
of
the
spark
plugs
will
retard
corrosion,
making
future
removal
of
the
spark
plugs
easier.
·
INSPECT
FOR
WEAR
&
CARBON
.
INSPECTl.NG
THE
SPARK
PLUGS
t
USE A 518" FLEX-SOCKET
TO REMOVE & INSTALL
SPARK PLUGS
~CHECK
FDR
DETERIORATION
AND
DAMAGE
ZINC
ANODE
[Raw
Water
Cooled
Models]
The
zinc
anode
is located just below the thennostat cover
and
next to
the
oil filter.The purpose
of
the zinc anode
is
to
sacrifice itself
to
electrolysis action taking place in the
raw
water
cooling
circuit,
th~reby
reducing the effects
of
electrolysis
on
other components of the
system.
The
condition of
the
zinc anode should be checked
monthly
and
the anode cleaned or replaceq
as
required. Spare
anodes
should be carried
on
board.
NOTE:
Refer
to
the
Cooling
Syste1it
pages
jot
Fresh
Water Cooled Thennostat
and
Zinc
Anode
assemblies.
THERMOSTAT
[Raw
Water
Cooled
Models]
A thermostat
controls
the
coolant
temperature
as
the
raw
water
continuously
fiows
through
the
closed
cooling
circuit.
When
the engine is
first
started,
the
closed
thermostat
prevents
the
water
from
fiowing
(some
water
is
by-passed
around
the
thermostat
to
provide coolant circulation
in
the
engine
block).
As
the
engine
warms
up,
the thermostat
gradually
opens.
The
thermostat
is
accessible
and
can
be
checked,
cleaned,
or
replaced
easily.
Carry
a
spare
thermostat
and
gasket.
If
you
suspect a
faulty
thermostat,
place
it
in
a
pan
of
water
and
bring to a
boil.
A
working
thermostat
should
open
when
heated
and
close
when
cold.
ZINC
ANODE
THE
GASKET
IS
SEALED
TD
THE
CASTING
AND,
UNLESS
DAMAGED,
CAN
BE
LEH
IN
POSITION.
ADD
SEALANT
TD
THE
GASKET
SURFACE
WHEN
REASSEMBLING
THE
COVER.
GASKET
(PN.048150)
APPLY
SEALANT
.
WHEN
INSTALLING
· ·
·THERMOSTAT
ASSEMBLY
ZINC
ANODE
AND
GASKET
(PN.048017)
Engines & Generators
27
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