Westerbeke 21A Manual de instalación descargar pdf (Pagina 10)

ENGINE LOCATION

The overall layout of the engine room should be planned for

easy inspection, servicing, and handling of the engine.

Thoroughly study all the equipment to be installed and make

a paper plan to provide optimum engine room space.

Consider the following:

1. Ventilation – Since an increase in engine room

temperature causes a reduction in the intake air and thus a

drop in engine output, ventilation inside the engine room

must be ample. See your Operators Manual for the

ventilation requirements for your engine/generator.

a. Dimension and capacity with a ventilator installed

b. Dimension and capacity with an intake duct

installed

2. Engine Room Height – For engines having a top oil fill,

the distance from the oil cap at the top of the rocker cover

to the overhead must be enough that oil can easily be

added.

3. Space to move the propeller shaft flange – Allow

approximately 3 - 4 in (7.7 - 10.0 cm) of space to move

the flange toward the stern for changing the transmission,

etc.

4. Exhaust System – Make sure there is adequate space for

all exhaust system components, including the exhaust

silencer. See the BASIC EXHAUST SYSTEMS section in

this manual.

ENGINE BED

A strong mounting bed contributes to the satisfactory

alignment and operating of the engine. The 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 be strong enough to keep the engine’s alignment within

one or two thousands of an inch at all times. The bed has to

withstand the forward push of the propeller shaft. It is also

critical that the beds are parallel to one another and to the

line of the propeller shaft when viewed from above. They

also must be offset an equal distance from the line of the

propeller shaft.

In fiberglass hulls, we recommend that solid wooden support

stringers similar to those in wooden hulls be formed and

fitted, then glassed securely to the hull. This will allow the

hanger bolts to be installed firmly in the wood, thereby

reducing noise and transmitted vibration.

The stringers must be as wide or wider than the engine

mounting isolator. Avoid excessive height. Isolator overhang

and/or rounded stringer surfaces are detrimental to the

flexible mounts’ ability to retain vibration.

Supports between the bed stringers and supports extending at

right angles from the stringers to the hull may be required for

proper strength and to aid in the absorption of vibrations.

The engine bed must be constructed so that a wrench can be

set at the engine base to retighten the engine mounting bolts

at the mounting feet.

Many boat manufacturers are now providing preformed

fiberglass mounting beds for their engine installations. These

beds, when used, should be of sufficient thickness for proper

support and should be well-glassed to the hull when installed.

Avoid the temptation to install the engine on a pair of angle

irons glassed in place. Such a construction will allow

vibration to pass through to the hull. Flexible engine

mounts require a firm foundation.

When preparing the engine load, also plan out and build an

engine drip pan. To simplify cleaning up after oil changes,

consider a separate drip pan for use under the oil and fuel

filters.

SSB RADIO/ELECTRONIC GROUNDING

If your boat needs a ground plane for a radio and other

electronic gear, this is the ideal time to bond a substantial

area of copper mesh into the base of the engine space while

it is accessible.

ENGINE LOCATION AND MOUNTING

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Westerbeke 21A Manual de instalación Pagina 10

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