Westerbeke DS Manual

WESTERBEKE
Model DS
Marine Diesel Engine
5 hp. 187 Ibs.
For large daysailers
and small cruising boats.
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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.
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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.