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Westerbeke WPDS-20 Manual del operador Pagina 6

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Engine
Bolts
Bronze
or
stainless steel hanger bolts of appropriate size are recommended
for
use through the engine's
flexible mounts. Less preferred are
lag screws because their hold on the
Wood
is weakened every time they
are moved, whereas the hanger bolts stay in position.
If the nut on top
of
the hanger bolt is removed
to
allow
the engine
to
be lifted from
~s
resting place, the hanger bolt
~self
remains
in
place as a stud. Consequent-
ly, the bond between the hanger bolt and the wood
is
not weakened by the removal
of
the nut
or
the engine.
Foundation
for
the
Engine
A good engine bed contributes much toward the satisfactory operation
of
the engine. The engine's bed
must be rigidly constructed and neither deflect nor twist when it is subjected
to
the engine's weight
or
to
the
pressures that the boat may experience while operating in rough seas. The bed must keep the engine's
alignment within one
or
two
thousandths of an inch of this position at
all
times. The bed has
to
withstand
the forward push
of
the propeller shaft which pushes against the thrust washer bearing which finally pushes
against the engine's bolts and bed.
In fiberglass hulls, we recommend that similar wooden stringers as in wooden hulls be formed, fitted, and
then glassed securely
to
the hull. This allows the hanger bolts
to
be installed firmly in the wood, thereby
reducing noise and transmitted vibration.
The engine support stringers must be as wide
or
wider than the engine mounting isolator. Isolator overhang
and/or rounded stringer surfaces are detrimental
to
the isolators' ability to retain vibration.
Preformed fiberglass engine beds, when used, should be
of
sufficient thickness
to
properly support the en-
gine and should be
well-glassed
to
the hull when
installed.
The temptation
to
Install the engine on a pair of
fiberglass angle
Irons must be resisted. Such
construction will allow engine vibration
to
pass
through
to
the hull. Flexible mounts require a firm
foundation against which they must act ifthey are
to
perform their function. When possible, follow
bed design A and avoid bed design B (refer
to
the illustration).
Supports between the bed stringers, and extend-
ing from the stringers
to
the hull, may be required
for proper support and
to
aid in the absorption
of
vibrations.
Westerbeke Diesel
Engines
A
BAD
B
Note:
Avoid
excessive
height,
use
solid
stringer
construction
(A).
12
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