Cooling - Beta Marine Beta 10 Operator's Maintenance Manual

Notes:
1. The mechanical fuel lift pump is
fitted to all engines as standard,
but if a suction head of 0.25m is
required then an electric fuel lift
pump must be fitted (ask your
dealer or Beta Marine).
2. It is very important that the
excess fuel from the injectors is
fed back to the fuel tank and not
back to any point on the supply
3. Fuel pipe sizes are:
Beta 10
BZ482 / Beta 16
BD722 / Beta 25
SEAWATER INLET SYSTEM (HEAT EXCHANGER COOLED ENGINES)
Your engine is fitted with a gear
driven sea water pump which sucks
in seawater or raw water to cool the
closed circuit system via the heat
exchanger.
1. It is very important that the
seawater inlet should have a
strainer system either built into
the sea cock or a high level
system with visual inspection
glass, as shown, mounted just
above the water line.
2. The inlet sea cock and pipe work
to the sea water pump should be
22mm ID or 3/4" minimum.
3. Good access to the inlet seacock
is essential so that plastic bags or
sea weed trapped in the intake
can be poked out!
4. All pipe work should have
approved marine grade stainless
steel hose clips. Any loose
clamps or bad connections can
line. This will help prevent air
getting into the system.
4. Any fuel leaks in the system are
likely to cause poor starting and
erratic running and must be
corrected immediately.
5. A fuel/water separator must be
installed.
6. The fuel return (leak off) pipe
must loop down to be level with
Supply (mm)
8
8
8
cause flooding and sinking of the
vessel.
5. If water is required for stern tube
lubrication then this should be
taken from a 'T' piece in the pipe
going from the heat exchanger
outlet to the water injection bend.
6. Scoop type water pickups should
never be used, as water will be
forced through the pump and
into the exhaust system whilst
7. Fuel lines and hoses must be
Leak off (mm)
8
8
8
Note: The maximum lift of the sea
water pump is 2m
30
the bottom of the tank before it
enters the top of the tank - see
12. This prevents fuel 'drain
down'.
secured and separated or
protected from any source of
significant heat. The filling,
storage, venting and fuel supply
arrangements and installations
must be designed and installed so
as to minimise the risk of fire and
explosion. Flexible fuel hoses
connecting the engine to fuel tank
supply and return lines must meet
the requirements set in standard
ISO 7840:1995/A1:2000 and as
required by your surveyor /
authority.
the vessel is in motion. This is
very dangerous as the exhaust
will eventually fill and raw water
will back up into the engine
through the exhaust valve.
Catastrophic failure will result as
soon as the engine is restarted.
Water Level