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Model
OS
Specifications
Type: One cylinder four cycle vertical diesel.
Displacement:
15
.9
cu
. in.; bore 3 in.; stroke 2
Y4
in.
Power: 5 hp at 3000 rpm continuous.
Compression Ratio: 16.25:1.
Weight: 1871bs. with
2:1
reduction gear.
Cylinder
Block
: Aluminum.
Cylinder: Cast Iron.
Cylinder Head: Aluminum.
Crank
sh
aft: Steel, counterbalanced.
Connecting Rod: Forged steel.
Piston: Aluminum.
Bearings: Tri metal.
Lubr
ication: Full pressure to main
an
d large end bear-
ings. Full flow integral replaceable lube oil filter.
Cooling System: Positive displacement rubber impeller
raw water pump.
Installation Angle:
IS
' maximum.
Fuel System: Bryce in
ject
ion pump, variable speed gov-
ernor
wit
h automatic overload control. Camshaft
driven fuel
lift
pump with hand primer.
Fuel Consumption: See fuel consumption curve.
Electri
cal System:
12
volts 10 amp. Oelco-Remy starter-
generator.
Transmission: Paragon/ Westerbeke
2:1
reduction and
reverse gear
wit
h positive neutral.
Standard Equipment:
2:1
manual reverse and reduction
gear; electric starter-generator; cooling system with
raw water pump mounted; flexible engine mounts;
sump pump and hose; full flow lube oil filter; secon-
dary fuel oil filter; fuel lift pump
wit
h hand primer;
flexible hose connections for fuel supply and return;
threaded exhaust flange 1"
IPS
; mounting brackets for
controls; key switch.
'5
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000
I
~OO
2000 2500
3
000
RPM
Why
a
OS
for sailboats?
The Westerbeke model
OS
is small and
light
. so that
even daysailers can enjoy the advantages of diesel safety
and inboard reliability.
Outboard motors are fine for outboard motorboats, but
they are not ideal for sailboats. The weight
of
a stern-
hung outboard kills a sailboat
in
a seaway. An outboard
in a well is somewhat better from a weight stand-point,
but its drag
is
considerable. Our model
OS
keeps weight
inboard and, when used with a folding propeller, creates
minimal drag. It also gives better control by speeding
water past the rudder.
In the past, diesel engines were considered too large,
heavy, and expensive for small boats,
so
gasoline en-
gines were used despite their hazards. Comparing
our
model OS with the most popular gasoline inboard sail-
boat engine, it
is
smaller, weighs about half as much, and
costs no more. Naturally, the four-cylinder gasoline en-
gine has a higher horsepower rating, but our built-in 2:1
reducti
on
gear lets the model
OS
use nearly all its 5 hp
to drive the boat, while the gasoline engine probably
won't drive a small sailboat much faster.
Although a one-cylinder engine
is
rarely smoother than a
four, our model
OS
, with its heavy flywheel, carefully bal-
anced parts, and soft mounting system,
is
remarkably
smooth. With all these features, we believe
it
makes eco-
nomical sense to install a Westerbeke model
OS
.
Westerbeke engines are sold andserviced by Westerbeke
distributors in
major
port
cities in the United States.
J.
H.
WESTERBEKE
CORP.
LEDIN
DRIVE,
AVON
INDUS
TRIA
L
PARK
,
AVON
,
MASS.
02322
CABLE
: W
ESTCORP
,
AVON
TELE
X:
92
-4444
13857 Printed
In
U.S A.
