Westerbeke 50 User Manual

accomplished.
Take pLenty of time in making this alignment and do not be
satisfied with anything less than perfect results.
The alignment is correct when the shaft
can be slipped backward and forward into the
counter bore very easily and when a feeler
gauge indicates that the flanges come exactly
together at all points. The two halves of
the propeller coupling should be parallel
within 0.002 inches (A).
In making the final check for alignment,
the eng ine half coupling should be held in
one position and the alignment with the pro-
peller coupling tested with the propeller
coupling in each of four positions, rotated
90· between each position. This test will also check whether the pro-
peller half coupling is in exact alignment on its shaft. Then,
keeping the propeller coupling. in one position, the alignment should
be checked rotating the engine half coupling to full position each 90·
from the next one.
The engine alignment should be rechecked after the boat has been
in service for one to three weeks and, if necessary, the alignment
remade. It will usually be found that the engine is no longer in
alignment. This is not because the work was improperly done at
first but because the boat has taken some time to take its final
shape, and the engine bed and engine stringers have probably absorbed
some moisture. It may even be necessary to re-align at a further
period.
The coupling should always be opened up and the bolts removed whe-
never the boat is hauled out or moved from the land to the water, and
during storage in a cradle. The flexibility of the boat often puts a
very severe strain on the shaft or the coupling or both when it is
being moved. In some cases the shaft has actually been bent by these
strains. This does not apply to small boats that are hauled out of
the water when not in use, unless they are dry for a considerable
time.
EXHAUST SYSTEM
Exhaust line installations vary considerably and each must be
designed for the particular job. The general requirements are to pro-
vide an outlet line with a minimum of restrictions and arranged so
that sea water, rain water or condensation cannot get back into the
engine. There should be a considerable fall in the line between the
exhaust manifold flange and the discharge end. This slope in the pipe
makes it difficult for water to be driven in very far by a wave, and a
steep drop followed by a long slope is better than a straight gradual
slope. Avoid any depression or trough to the line which would fill
with water and obstruct the flow of exhaust gas. Also avoid any sharp
bends.
Brass or copper is not acceptable for wet exhaust systems, as the
combination of salt water and diesel exhaust gas will cause rapid
deterioration. Galvanized iron fittings and galvanized iron pipe are
recommended for the exhaust line. The exhaust line must be at least
as large as the engine exhaust manifold flange and be increased in
size if there is an especially long run and/or many elbows. It should
be increased by 1/2" in I.D. for every 10 feet beyond the first
8

Westerbeke 50 Specifications

General

Brand	Westerbeke
Model	50
Category	Engine
Language	English