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Westerbeke 12C- TWO User Manual

Westerbeke 12C- TWO
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ENGINE
ADJUSTMENTS
NOTE:
WESTERBEKE
':;'commends
that
the/allowing
engin~
adjust-
.
ments
be
peiformed
by
a
competent
engine
mechanic.
The
information
below
is
provided
to
assist
the
mechanic.
ENGINE
COMPRESSION
Check;
the engine's
compression
pressure
at
500
and
1250
openiting'houis
or
whenever
engine
perfonnance
is
reduced.
Remove
each
glow
plug
and
check
each
cylinder's
compression
pressure.
The engine's cranking
speed
is
at
280
rpm.
MEASURING
COMPRESSION:
Check
LIe
compression
pressure.
To
do
this wann
the
engine,
remove
all
fuel
injectors,
or
glow
plugs,
disconnect
the
fuel
shut-off
solenoid
wire,
and
install
a
compression
adapter
in
the
injector
hole
or
glow
plug
hole.
Connect a
compression
tester
on
the
adapter
and
cnmk
the
engine
with
the
starter
motor
until
the
pressure
reaches
a maximum
value.
Repeat
this
process
for
.each
cylinder.
Look
for
cylinders
with
dra-
matically
Cat
least
20%)
lower
compression
than
the
average
of
the
others.
Compression
pressure
should
not
differ
by
more
than
35.5
psi
C2.5
kglcm')
at
280rpm.
If a weak
cylinder
is
flanked
by
healthy
cylinder,
the
problem
is
either
valve
or
piston
related.
Check
the
valve
clearances.
for
the
weak
cylinder,
adjust
as
needed
and
test
again.
If
the
cyliilder
is
still
low,
apply
a
small
amount of
oil
into
the
. cylinder
to
seal
the
rings
and
repeat
the
test.
If
compression
comes
up
-the
rings
are
faulty.
.
Abnormally
high
readings
on
all
cylillders
indicates
heavy
carbon
accumulations,
a
condition
that might
be
accompanied
by
high
pressures
and
noise.
NOTE:
In
case
of
severe
vibrations
and
detonation
noise,
the
cause
may
be
fuel
injector
problems,
see
FUEL
INJEC~
TORS.
Poor
fuel
quality.
contaminates
and
loss
of
positive
fuel
pressure
to
the
injection
pump
will
result
in
injector
faults.
.
When
re-installing
the
glow
plugs
use
anti-seize
compound.
COMPRESSION
VALUES
STANOARD
(AT
280
RPM)
398.16
PSI
(28Kg/cm')
MINIMUM
(AT
280
RPM)
355.5
PSI
(25Kg/cm"
MAXIMUM
ACCEPTABLE
DIFFERENCE
BETWEEN
35.5
PSI
(2.5
Kg/em"
DRIVE
BELT
ADJUSTMENT
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
temperamres.
The
drive
belt
is
properly
adjusted
if
tlie
belt can be
deflected
no
less
thim
3/8
inch
ClOmm)
and
no
more
than
1/2
inch (l2mro)
as
the
belt is
depressed
with
the
thumb
at
the
midpoint
between
the
tv(o
pulleys
on
the
longest span
of
the
beli.
A spare bolh,r belts
should
always
be carried
on
board.
A
WARNING:
Never
attempt
to
check
or
adjust
the
drive
helt's
tension
while
the
engine
is
in
operation.
Adjusting
Belt
Tension
1.
Loosen
the
alternator
pivot
bolt.
2. Loosen
the
alternator
alljusting
bolt.
3. With
the
alternator
loose,
swing
it outward
l1I1i:i!
the
drive
belt is
tensioned
correctly.
4.
Tighten
both
bolts.
S.
Check
the
tension
again
after
the
engine
has
been
in
.
operation.
Engines & Generators
39

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Westerbeke 12C- TWO Specifications

General IconGeneral
BrandWesterbeke
Model12C- TWO
CategoryEngine
LanguageEnglish

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