Wartsila 31 Product Manual page 72

7. Lubricating Oil System
The engine has a wet or a dry sump oil system depending on the installation application.
In dry sump, suction pipes are connected to external lubricating oil system and back to engine
driven lubricating oil pump. The suction pipe must be equipped with a non-return valve.
In wet sump, suction pipes to the main lubricating oil pump, prelubricating oil pump and
separator are connected in the oil sump. Oil strainers are connected to the suction pipes for
the pumps. An oil dipstick is located at the top of oil sump on the side of engine block. The
oil dipstick indicates the maximum (HIGH) and minimum (LOW) limits between which the oil
level may wary. There is also an oil level transducer (LS204) connected to the engine automation
system. The transducer is measuring the low level of oil in the oil sump.
The direct driven lubricating oil pump is of screw type and equipped with a pressure control
valve. The pump is dimensioned to provide sufficient flow even at low speeds. Concerning
flow rate and pressure of the engine driven pump, see Technical data.
The pre-lubricating oil pump is an electric motor driven gear pump equipped with a safety
valve. The pump should always be running, when the engine is stopped. Concerning flow rate
and pressure of the pre-lubricating oil pump, see Technical data.
The lubricating oil module built on the engine consists of the lubricating oil cooler, thermostatic
valve and automatic filter.
The centrifugal filter is used as a by-pass filter, for oil quality indication only.
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Wärtsilä 31 Product Guide
Wärtsilä 31 Product Guide - a1 - 18 October 2016