SERVICE BULLETIN
V.13
DATE:
April 15,
1976
BULLETIN
NUMBER:
89
MODEL:
Westerbeke
30
(formerly 4-91)
SUBJECT:
Internal
Changes
Since Introduction
There
is
a
serial
number
nameplate
riveted to the block
behind
and
just
below
the
lube oil cooler.
It
is best seen
by
shining a
flashlight
upwards
from
below.
This
basic block
serial
number
is
composed
of a prefix
and
a suffix.
The
suffix
is
the
last
three to six characters following the
last
slash or
hyphen.
The
prefix
is
all
which
precedes the
last
hyphen
or slash.
Only
the suffix
has
been
transposed to the
Westerbeke
nameplate through April
1976.
It
becomes
the
first
portion of the
serial
number
on
the
Westerbeke
nameplate; the
last
portion is a shipping
code
for internal
use
only.
Since the introduction of the engine in
1969,
there
have
been
four
different
suffixes
used
in part to denote various internal engineering
changes
to the block.
When
ordering
parts,
these suffixes are
an
integral part of the engine
serial
number
and
must
be
supplied.
Chronologically, the following
changes
have
taken place:
1)
a
slight
water
pump
change
not affecting interchangeability,
2)
a
major
water
pump
change
requiring a
new
cylinder block,
3)
enlarged water passages requiring a
new
block,
head
and
head
gasket
implemented
simultaneously with a
new
valve retention design eliminating
the
cotter
retaining
clip
and
the cylindrical seal.
The
main
purpose of
this
bulletin
is
to outline these
changes
with
their
serial
number
cut
off
points.
See
the table
on
the reverse side of
this
Service Bulletin.
The
new
head
gasket
is
usable
on
any
previous engine
and
must
be
used
from
the
change
point
onwards.
The
new
water
pump
must
be
used
from
the
change
point
onwards
and
cannot
be
used
in
an
earlier
engine block.
The
new
valves
must
be
used
from
the
change
point
onwards
and
should
be
used
as
replacement parts along with the
new
cotter
and
top
cup.
We
will only supply cylinder blocks
and
block assemblies
from
current production.
All
this information
is
included in Edition 6 of the
Westerbeke
30
Parts List being
issued in April
1976.
PIN:
18978
J. H. WESTERBEKE CORP.
AVON
INDUSTRIAl.
PARK,
AVON,
AlASS.
02322·
(.f7}
5.8-7700
CABl.E:
WESTCORP,
AVON·
TEl.EX:
82-4444
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