OPERATING MANUAL FOR BUKH DV36ME ENGINES
009W0327-R03
- 7 -
Fuel lift pump
The fuel lift pump is a cam shaft driven sealed type diaphragm pump, which cannot be
dismantled for repair or cleaning. It is recommended to install a water/dirt accumulating
filter in the suction line to the pump.
After repairs the fuel system must be bled as described under ”Preparation for the first
start” if necessary.
Lubricating Oil System
The engine is pressure lubricated and the oil system has a built-in relief valve for
controlling the oil pressure. A lubricating oil cooler is also fitted.
The oil level is checked as mentioned before.
Change of Oil
Lubricating oil should be changed for the first time after 25 hours of running,
later for every 150 hours or at least once a year. It is recommended to chan-
ge the oil when engine is warm, and the procedure is as follows:
1. Turn the left cock below oil bilge pump 90°.
2. Pump up the oil from the sump by means of the bilge pump.
3. When the sump is empty pour fresh oil.
4. Check oil level on dipstick.
Recommended Lubricating Oil
Modern diesel engines demand heavy-duty oils with additives securing best
operation conditions and longest life time of the engine under various conditions.
Therefore use a first class HD-oil from a recognized oil company.
Oil specifications as mentioned in ”LUBRICATION OIL CHART”.
When operating under difficult conditions, i.e. frequent cold starting,
short operation periods, greatly varying loads, use quality ”Service
CD” and also use quality "Service CD" in case the sulphur content of
fuel is higher than 1 %.
Change of Lubricating Oil Filter
Lubricating oil filter cannot be cleaned, but should be changed every
150 hours or once a year. To change the filter proceed as follows :
1. Unscrew filter A and discard it.
2. Clean the sealing surface of the engine B, and remove old
gasket C if any from old filter
3. Mount new filter at once under clean conditions.
4. Screw on filter until gasket fits tightly, tighten a further half turn.
5. Fill with oil until normal level is reached.
6. Start the engine and check that the filter is tight.
Cooling water system
Normally the engine is direct seawater-cooled, however, alternatively it can be delivered with freshwater-cooling, or it may
be fitted with this later on. Freshwater-cooling is particularly used in boats running more than 500 hours a year.
Seawater cooling
From external strainer the cooling water is drawn through the lubricating oil cooler to the pump from where the water is fed
through the cooling jackets up to the cylinder head and from there, via the watercooled exhaust manifold and thermostat
overboard, through the exhaust pipe. A thermostat is fitted in the watercooled exhaust manifold. This ensures a constant
cooling-water temperature between 50-75°C
Exchange of zinc anode
In order to protect against corrosion in the engine cooling-water system, there is one zinc anode fitted on the starboard side
of the crankcase under the water-cooled exhaust manifold. The zinc anode must be checked 2-3 times during the season,
dependent on the waters you are sailing in. If the zinc anode is corroded away it must be replaced.
Exchange of impeller in cooling-water pump
The cooling-water pump is a rotary pump with a neoprene impeller. The impeller cannot stand up to dry running for more
than 20 sec., and this is why you must make sure before starting the engine that the sea-cock is open. When building the
boat or during winter storage of the engine, you must not put water pressure to the seawater in-take, as this may fill the
engine cylinders with water. Due to varying temperatures and the one-sided deformation during the winter storage, the
impeller should be taken out and kept separately during this period. Change the impeller by slackening the six screws in the
cover of the pump, remove the cover and withdraw the impeller which is fitted on a multi spline shaft. Too high cooling
temperature (defective pump impeller) or defects on thermostat will cause the blue lamp in the control panel to light up and
the acoustic alarm to function. If the thermostat is removed, the by-pass for cooling water has to be closed.
