TP-5592 7/96 Installation 6-13
Locatetheexhaustoutletatleast4in.(10cm)abovethe
waterline when craft is loaded to maximum capacity.
Typically, install a flapper at exhaust (transom) outlet to
prevent water backup in following seasor when moving
astern (backward).
Exhaust system guidelines for various generator set
locations follow. Information and illustrations of stern
(rear) exhaust installations also apply to side-exhaust
installations. Where exhaust lines would require
passage through bulkheads, it may be more practical to
use port- (left) or starboard- (right) side exhaust outlets.
This would be especially true where long exhaust lines
to the transom (rear) could cause excessive back
pressure. Should anyinformation regardinginstallation
conflict with USCG Regulations, follow regulations.
Above Waterline
In addition to considerations described earlier, install a
customer-supplied silencer with silencer outlet at a
maximum of 10 horizontal ft. (3 m) from center of
engine’s exhaust outlet. See Figure 6-14. Mount a
typical silencer with inlet and outlet horizontal and with
drain plug down. A pitch of at least 1/2 in. (13 mm) per
running foot (30.5 cm) is preferred. Some silencers
require two supporting brackets or hanger straps for
installation to stringers or other suitable structure. Any
liftintheexhaustlinetoimprovesilencingmustbebelow
engine exhaust manifold outlet.
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