Callesen Diesel Page 6 of 12 Sheet No. 7-94-2A
the cooling water temperature. As described above, it must be about 65-70ºC. If this level is
exceeded, the alarm device will give a warning.
The oil pressure can be checked in the wheelhouse where manometers for lubricating oil and clutch
oil pressure are fitted. As mentioned before, the lubricating oil system is connected to the alarm de-
vice which will give a warning in case the oil pressure drops below approximately 0.5 kp/cm².
It is recommended, during daily operation, to inspect the engine approximately every 3-4 hours to
see if everything is in order. At the same time lubricant should be applied where necessary (water
pumps and sterntube).
The small air filters on the valve covers should be cleaned every two months. The starting valves in
the cylinder covers should be lubricated about every three months: Loosen the plug which goes
down into the large fitting above the valve and pour down about 6-8 drops of oil on the valve, but not
more, and screw the plug up again.
During operation the engine oil level should be checked daily, the oil level of the clutch case approx
every week; in both cases when the engine is warm and idling.
A small grease cup is placed on the front end of the engine at the flywheel and on the aftermost end
cover near the flange coupling. This grease cup should be lubricated only little every week,
approximately, for lubrication of the shaft packing ring.
In case the lubricating oil pressure "before filter" rises to more than 5 kp/cm² when the engine is
warm, the filter inserts should be replaced by new ones. Normally, the pressure is about 4 kp/cm².
The filters can be replaced during operation as the oil filter is equipped with a conversion cock and
the engine can run on one filter or the other, respectively, or on both filters at the same time. The
latter is normal. The clutch and reversal oil pressure must be 7 kp/cm² unloaded and 9 kp/cm² at full
revs.
On newer engines a two-step overflow valve is fitted; in this case normal oil pressure is about 9
kp/cm² and during reversing the pressure rises to about 16 kp/cm² and drops to 9 kp/cm² again after
the operation.
If the engine starts smoking after having been used for a prolonged period (it may have many dif-
ferent reasons, see "Working Trouble"), the cause of the smoking must be identified and remedied
as soon as possible, as thick formation of smoke will cause great wear of the cylinders and pistons
and may result in sticking piston rings, damaged valves etc. If, under the given conditions, it is im-
possible to correct the fault at once, reduce the load until the smoke nearly disappears.
If the cooling or bilge pump starts leaking, the stuffing boxes must be tightened up; if necessary, the
pumps must be repacked. On newer engines the stuffing boxes are equipped with special packing
rings.
When checking the pump valves, remove the air vessel under which the valves (balls of synthetic
rubber) are placed (see 7-62).
Should the oil pump of the lubricating system fail for some reason, the engine can be operated if the
oil pressure is kept up by means of the hand pump. All larger engines are equipped with by-pass
pipes and switchcocks so that the suction pump as well as the pressure pump can be used for
lubricating the engine.
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