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A4
DESCRIPTION
This high efficiency, naturally aspi-
rated diesel engine is a well-proved
power unit of advanced design and in-
corporates the very latest results of
research in diesel engineering tech-
niques.
Favorable
high power-to-
weight ratio with outstanding reliability
and the greatest economy in operation
are marked features of the engine.
The
Westerbeke 60 engine is robustly
constructed
and
manufactured
to
exacting
production
standards
for
withstanding the most arduous duties -
inherent Westerbeke qualities which
play an important role in reducing
routine attention and maintenance to a
minimum, while at the same time ap-
preciably extending intervals between
major overhauls.
Outstanding features
of the
design
include
monobloc
construction,
a
forged
alloy-steel
crankshaft
with
'Tuftride'
treated bearing journals,
and the Ricardo Comet Mk VB spheri-
cal anti-chamber combustion system.
CYLINDER BLOCK AND CRANKCASE
Special cast iron monobloc casting pro-
vided with adequate ribs and wide joint
flanges,
giving a light construction
with maximum rigidity. Large capacity
water jackets are cast around each
bore. There is a closed circuit breath-
ing system fitted
CYLINDER HEAD
Manufactured from special cast iron
and secured by twenty-five 7/16 in.
(11.1 mm) diameter high tensile steel
studs to the cylinder block.
Combus-
tion chambers of Ricardo Comet design
are incorporated and renewable valve
guides are fitted.
CRANKSHAFT
Special
alloy
steel
forging
with
'Tuftride' hardened bearing journals.
The shaft,
which is fully counter-
balanced by design and also dynamically
and statically balanced, is carried in
three steel-lined reticular tin aluminum
shell bearings. 2.478 in. (62.94 mm)
diameter giving a total
~rojected
area
of 10.424 in 2 (67. 24 cm ).
CONNECTING RODS
'I'
section heat-treated alloy steel
stampings.
The big-ends are fitted
with
steel-backed
lead-indium thin
shell bearings, 2.248 in. (57.07 mm)
diameter,
and the small ends with
steel-backed lead-bronze alloy bushes,
1. 125 in. (28.58 mm) diameter.
Total
big-end
bearing
projected
area
8. 720 in 2 (56. 26 cm 2 ).
PISTONS
Anodized aluminum alloy with solid
skirt.
Each piston has one chrome-
faced compression ring,
one taper-
faced compression ring, one stepped
scraper ring, and one slotted oil con-
trol ring.
The fully-floating gudgeon
pins 1. 125 in.
(28. 58 mm) diameter
are located laterally by circlips.
VALVE GEAR
Overhead
poppet-type
valves
are
operated by means of flat-faced piston-
type tappets and push-rods from the
camshaft,
which is
situated in the
engine casing and adjacent to
the
crankshaft.
The
inlet
valves are
manufactured from silicon chromium
steel and the
exhaust valves from
nickel
chromium
manganese
steel.
Double coil springs are fitted to each
valve.
CAMSHAFT
Steel forging with case-hardened inte-
gral cams
and supported in three
steel-backed
white metal bearings.
TIMING GEAR
The camshaft and fuel injection pump
are chain driven from the crankshaft.
Slipper and tensioner units are fitted
to ensure smooth working of the timing
gear.
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