Westerbeke 21A Manual de instalación descargar pdf (Pagina 15)

PROPELLER SHAFT COUPLING (Engines)

A propeller shaft half-coupling is available for all engine

models. It is bored to shaft size for the specific order, and has

either a keyway with set screws and two locking bolts, or is

of the clamping type with a keyway.

This coupling is carefully machined to allow a slight

forced-fit onto the shaft and to make an accurate mating

surface between the coupling and the output flange of the

transmission.

The forward end of the propeller shaft has a long straight

keyway. Any burrs should be removed from the shaft’s end.

The coupling should be a light drive fit onto the shaft, and

the shaft should not have to be scraped down or filed in order

to get a fit. It is important that the key be properly fitted to

both the shaft and to the coupling. The key should fit the side

of the keyway closely but should not touch the top of the

keyway in the hub of the coupling.

If driving the coupling over the shaft is difficult, the coupling

can be expanded by heating it in a pail of boiling water. The

face of the propeller coupling must be exactly perpendicular

to the center line (axis) of the propeller shaft. Have a

machine shop fit the coupling and face the coupling so that

the mating surface of the flange is at a perfect right angle to

the propeller shaft.

After driving the coupling over the shaft, remove the two

locking bolts from the coupling and countersink the shaft

below each locking bolt hole. Insert and tighten the two

bolts, then wire the two bolt heads together with stainless

wire. This will secure the coupling to the shaft. For

additional security a stainless hose clamp can be tightened

around the coupling shoulder and over the two bolt heads.

FLEXIBLE COUPLINGS

A flexible coupling or a “drive saver” can be installed

between the WESTERBEKE shaft coupling and the

transmission coupling to reduce vibration and absorb thrust

and torque. This is an important consideration when using

flexible engine mounts. Follow the manufacturers’

recommendations and instructions.

These illustrations show typical propeller shaft installations

with variations on stuffing boxes and stern tubes. The

propeller shaft on the boat with the spade rudder is supported

by the stern tube. An external strut supports the shaft on the

other boat.

PROPELLER SHAFT ALIGNMENT

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Westerbeke 21A Manual de instalación Pagina 15

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