Westerbeke 21A Instrukcja Instalacji Pobierz pdf (Strona 18)

RECOMMENDED GUIDELINES

These guidelines dated February 2004 supercede all

previous guidelines published by Westerbeke

Corporation for all types of exhaust systems. Water

intrusion is not covered by warranty because it is not

caused by a product defect. Please study these guidelines

carefully before planning your exhaust system installation.

Throughout these guidelines our use of the word “engine” is

generic, it refers equally to either a propulsion engine or to the

engine driving a generator set, sea water and raw water are the

same.

Beyond conveying exhaust gases and cooling system sea

water out of the boat, the other purpose of the exhaust system

is to prevent sea water intrusion into the engine (at the exhaust

outlet) under all conceivable conditions of boat trim, boat

operation, sea conditions, and heel angle while not exceeding

the manufacturer’s back pressure recommendations. Seawater

intrusion is usually catastrophic to catalytic converters and

engines. The engine/genset supplier is not in a position to

judge what installation characteristics will prevent water

intrusion in all conceivable circumstances. That judgment is

the responsibility of the engine installer. What we as the

manufacturer can do is advise the best practice, as we see it,

leaving final judgments to the installer.

Sea Water Intrusion Through The Exhaust Outlet

The diagram above illustrates a below waterline installation

of an engine or genset. The letters A through H are the

important dimensions that are discussed in detail in the

following text:

Let’s start with A, the difference between the highest

underside of the boat deck near the engine/generator and the

high point of the exhaust run from the water lift muffler to

the exhaust outlet. A should be minimized. There is every

reason to attach the high point of the exhaust hose directly to

the underside of the deck. There is no reason to fail to take

full advantage of this maximum available height because it

forms the primary barrier to water intrusion.

We need to define the water line for exhaust installation

purposes. By water line we mean the highest point the water

level can reach, at the location of the exhaust through hull

fitting, from all conceivable causes - other than passing

waves of a duration of not more than a second or two. This

worst case water level could be caused by any of the

following: backing down aggressively, turning aggressively,

coming up onto a plane, decelerating off a plane, extreme

boat trim, high seas, wallowing in following seas, heeling,

etc. Hereafter these instructions will refer exclusively to this

worst case water level as the relevant water level to plan a

good installation.

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