D E H L E R 3 4
1.7.2. General
The boat may be operated with a maximum engine performance of 1 x 21 kW. Changes to the
concept must always be implemented in agreement with the yard. The shipyard cannot take on
liability for changes to the concept that were not agreed upon with the shipyard.
The speed must be reduced on crowded, much used waterways or in case of poor visibility.
Reduce the speed and keep a lookout for reasons of courteousness and your own and other
people’s safety. Observe the speed limits and the notices to avoid swell.
Observe the right of way as it is demanded by the rules for waterways (COLREGS).
Always keep a sufficient distance so that you can stop or manoeuvre to avoid collisions.
1.7.3. Instruments
H E L M P O S I T I O N
Rev counter
This instrument shows engine speed in revolution per minute. Cruising r.p.m. varies with
conditions and type of fitted engine.
Alarm systems
The acoustic alarm is released if the main engine cooling water temperature exceeds the
allowable limit or the oil pressure is too low.
The oil pressure alarm is also activated if the ignition is switched on but the engine is not running.
If the alarm is activated whilst the engine is running, the engine
should be down immediately and the reason of the alarm should
be investigated.
The engine should be warmed up slowly and not accelerated to
full speed if the operating temperature has not yet been reached.
1.7.4. Cooling system
The engine is equipped with a two-circuit cooling system.
The internal system is a closed circuit. In case of frost, an antifreeze agent must be added to the
internal circuit. The temperature is controlled by a thermostat. During winter storage, the cooling
water needn’t be drained off if it is mixed with an antifreeze agent suited for the existing
temperatures below freezing.
The external circulation draws seawater through the saildrive. After passing the heat exchanger
the cooling water is injected into the exhaust system in the exhaust elbow. Together with the
exhaust gas the cooling sea water is exhausted via the silencer and the exhaust pipe at the stern.
This guarantees a trouble-free engine operation. Moreover the engine noise is reduced..
The heat exchanger serves to cool the engine oil, the cooling water of the primary circulation and
the hydraulic oil of the gears.
The seawater filter must be cleansed regularly.
Check the seawater filter regularly. Depending on the water
quality, cleansing may be necessary.
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