Bukh DV36/48 Workshop Manual - page 128
009W2329-R01
O10
Header tank and heat exchanger
The arrangement of header tank and heat exchanger fitted on the top of the water cooled
exhaust manifold is shown on page O11.
In case of keel cooling the arrangement only serves as header tank and from the factory it has
been prepared for this by changes in proportion to the use as heat exchanger/ header tank,
and directly it will not be possible to change the function from keel cooling into heat exchanger
cooling without buying a new header tank or heat exchanger/header tank prepared for the
purpose.
Dismantling of heat exchanger
In order to clean the heat exchanger element or in order to test it for pressure, remove the
profile-cast rubber tubes on the inlet and outlet side of the seawater connection and take out
the element.
Further, exchange the element in case of corrosion or leaks, as it can not be recommended to
plug leaky pipes because of reduced heat conductivity.
Filling of anti-freeze solution
If you want to continue to use the boat in periods of frost pour water/anti-freeze solution
through the cap of the header tank, depending on what temperature you want protection
against.
Before doing so drain off the freshwater from the engine through the drain plug in the
crankcase and through the drain plug of the circulation pump.