ENGINE
ADJUSTMENTS
SPARK
PLUGS
The spark plugs should
be
cleaned and regapped after the
first
50
hour break-in period, then inspected every 250 hours
thereafter and replaced
as
needed.
A
WARNING:
00
not
remove
the
spark
plugs
while
the
engine
is
hot.
Allow
the
engine
to
cool
before
removing
them.
Spark
plug
gap:
0.031
+1-
0.0002
in.
(0.8
-
0.05
mm).
Spark
plug
torque:
10
-15
Ib-ft
(1.5
-
2.31
kg-m).
NOTE:
Loctite
Anti-Seize applied
to
the
threaded portion
of
the
spark plugs will
retard
corrosion,
making future removal
of
the
spark plugs
easier.
GAP
INSPECT
FOR
WEAR
&
CARBON
INSPECTING
THE
SPARK
PLUGS
INSPECT
FOR
DAMAGE
CHECK
FOR
DETERIORATION
AND
DAMAGE
DRIVE
BELT
ADJUSTMENT
The drive belt must be properly tensioned. Excessive drive
belt tension can cause rapid wear
of
the belt
and
reduce the
service life of the fresh water pump's bearing. A slack belt or
the
presence
of
oil on the belt can cause belt slipping,
resulting
in
high operating temperatures.
The
BCOB generator
has
two
drive belts, one drives
the
governor and alternator and
the
other drives
the
raw
water
pump.
The tension adjustment procedure for both belts
is
as
follows:
1.
Remove the belt guard.
2.
To
adjust the governor drive belt, loosen
the
two
governor
mounting bolts.
To
adjust the raw water pump/fresh water pump drive
belt, loosen the two raw water pump mounting bolts.
3. With
the
belt(s) loose, inspect for
wear,
cracks and frayed
edges, and replace
if
necessary.
4.
To
loosen or tighten the governor drive belt, slide the
governor in
or
out
as
required, then retighten
its
mounting
bolts.
To
loosen or tighten the
raw
water pump/fresh water
pump drive belt, slide
the
raw
water pump
in
or
out
as
required, then retighten
its
mounting bolts.
5.
The drive belts are properly adjusted if it
can
be
deflected
no
less than 3/8 inch (lDmm) and
no
more
than
1/2
inch
(12mm)
as
the belt
is
depressed with
the
thumb at the
midpoint between the two pulleys on the longest span of
the
belt.
NOTE:
Maintain a
22
lb
pressure
to
the
belt's outer face
for proper belt operation.
Spare
belts should always
be
carried
on
board
A
WARNING:
Never
attempt
to
check
or
adjust
a
drive
belt's
tension
while
the
engine
is
in
operation.
6.
Operate
the
generator for about 5 minutes, then shut down
the
generator and recheck
the
belt(s) tension.
7.
Replace
the
belt guard.
Engines & Generators
46
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