Climate Control; Cooling Service; Engine Backfiring; Air Conditioning And Heating - Back Cove Yachts Back Cove 30 Owner's Manual

engine coolant through small tubes contained in the
heat exchanger, while simultaneously circulating cool
seawater around these tubes, thus allowing for the
transfer of heat. The sea water and engine coolant
are kept entirely separate, leaving the engines'
internal compartments completely free from the
corrosion caused by saltwater.
The seawater enters the system through an intake
sea valve (see Fig_6.1-3) located in the engine
compartment. It is vital that the engine seawater
intake sea valve be left open at all times during
engine operation. The thru-hull for this sea valve is
covered with an external strainer that prevents any
large items from entering the system. A water pump
on the engine draws seawater through the external
strainer, and then through an internal water strainer
located in the engine room (see Fig_6.1-3).
The engine sea water pump utilizes a neoprene
rubber impeller. This impeller must never be run
dry. A spare impeller and impeller cover gasket
should always be kept on board. Refer to the
engine owner's manual for type, location, and
replacement procedures.
The recommended engine coolant is a solution of
water and anti-freeze. The anti-freeze keeps the
cooling water from freezing and also provides
important anti-corrosion properties. Check the engine
owner's manual for the appropriate water/anti-freeze
ratio and the recommended anti-freeze type.
C. Causes and Cures for Engine Overheating
Low coolant level
Add coolant after the engine has cooled
down.
Blockage at the external seawater strainer
Inspect and clean external strainer.
Blocked or clogged engine intake sea valve
Open and close sea valve several times to
unblock.
Clogged internal seawater strainer
Inspect and clean internal seawater strainer.
Broken impeller blades in seawater pump
Remove pump cover plate, replace pump
impeller and cover gasket.
Air in system
Bleed-off air.
Loose water hose connections
Tighten hose clamps.
Collapsed or ruptured water hose
Replace hose.
D. Cooling Service
The engine cooling systems should be serviced as
recommended in the engine owner's manual. The
system should be drained, flushed, and new coolant
added. Cleaning the system with an approved
cleaner will help to dissolve mineral deposits, oil
contamination, and sludge. The engine owner's
manual recommends proper cleaners for the cooling
system.
E. Engine Backfiring
The exhaust is constructed to withstand internal
pressure several times greater than that which is
expected in a normally operating wet exhaust
system.
Engine backfires are capable of very high
instantaneous pressures which may exceed the
system's capacity. If such a backfire occurs the
entire exhaust system should be inspected for
damage.
F. Water Heater
The water heater (see Fig_6.3-2) utilizes the engine's
cooling system as a source of heat. The engine
cooling water circulates through the water heater
where a heat exchanger heats the domestic hot
water.
Scalding may occur due to overheating the
domestic water after the engine has been run for
some time. Always exercise care when running
hot water.
7.11 Climate Control (HVAC)
A. Air Conditioning and Heating (optional)
The air conditioning/heating system installed in your
Back Cove is of the size and capacity best suited for
the size of your boat. The Back Cove 30 A/C systems
are available as options.