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34
c) Fill heat exchanger or header tank to the top of the
filler neck and replace cap. Press down firmly on filler
cap and hand tighten in a clockwise direction.
NB: Keel cooled engines require a large quantity of engine
coolant which is dependent upon the size of the entire
keel cooling system capacity. Please refer to the vessels
build specifications and or builder for guidance.
d) Run the engine for 5 minutes on no load AC electrical,
then stop the engine, release the filler neck pressure
cap to remove any air from the system, remove the
cap and check the level. Top up coolant to the filler
neck and replace the filler pressure cap.
e) Check the cooling system for leaks.
NB: For keel cooled engines it is very important to bleed
all of the air out of the complete engine cooling system
before the engine is run on load. Please refer to the
vessels build specifications and or builder for guidance.
f) If a calorifier is fitted care must be taken to see that
this is also full of coolant and all the air is bleed from
the calorifier circuit. Please refer to points 4 & 5 within
'Calorifier Connection' on page 44.
g) Run the engine for 15 minutes with
load, as the system initially warms up excess engine
coolant will be leaked off from the overflow pipe into
the bilge*. Stop the engine and allow the engine to
fully cool down before removing the pressure cap and
topping up the engine coolant to 25 mm/1" below
the filler neck.
*Subject to installation it maybe possble to place a drip
tray or container to catch coolant overflow.
h) Repeat (g) if engine coolant level is greater than 1
inch below the base of the filler neck when the engine
has cooled down top up to level to 1 inch below.
i) Check the cooling system for leaks.
j) Run engine on
k) Coolant should be drained off every 2 years and
NB: When draining the engine coolant system, ensure the
engine has cooled sufficiently to prevent scalding from hot
pressurised water. Prior to draining a cold engine, remove
the filler cap from the header tank and then open the
water drain tap (image 34). This allows the water to drain
freely from the system. Please refer to image 35.
TO AVOID PERSONAL INJURY:
Engine Coolant Pressure Cap
Removal of the pressure cap when the engine
is hot can cause severe injury from scalding hot
water under pressure, always allow the engine
to fully cool.
Using appropriate personal protective
/
AC alternator
equipment turn the cap anti-clockwise to the
1
3
stop, this allows pressure to be released. Then
press firmly down on the cap and continue to
turn anticlockwise to fully release the cap.
To re-fit the cap align its tangs with filler neck,
press down and firmly turn the cap clockwise
until it fully meets the stop position.
The engine thermostat starts to open at
71°C, as a consequence, the guide running
temperature should be between 71 > 85°C.
47
35
Engine coolant
overflow pipe
Engine coolant
filler neck
/
AC alternator load for 20 minutes,
2
3
check for leaks and repeat (h) & (i).
replaced with a new solution.
CAUTION!
IMPORTANT!
Engine coolant
pressure cap
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