Recently several entered vessels have observed main
engine breakdowns brought on by heavily contaminated lubricating essential oil.
All of the vessels were relatively recent.
Modern marine diesel motors are technically complex and
they are becoming increasingly powerful and effective.
However , newer engines could be less forgiving than
old units if not operated, managed and lubricated correctly.
Lubricating Oil
The lubrication associated with moving parts is crucial
in order to diesel engine performance as well as longevity.
Lubricating oil decreases friction between components,
sets apart opposing surfaces and stops metal-to-metal contact. It also will act
as a coolant and minimizes the effect of corrosion. But the condition of the oil
has a tendency to deteriorate with use, primarily due to contamination and
chemical substance activity.
The manufacturer’s guide for the engine will provide
information on the quality and properties regarding lubricating oil required.
The actual manual will also include assistance with how the oil should be
supervised and maintained while the motor is running to ensure that this remains
suitable for use. This kind of advice is generally based on investigation
findings, operational experience, continuing analysis and other factors such as
technical common sense. The details will even include a margin of mistake to
minimise the risk of the actual engine being damaged since the lubricating oil
deteriorates, however the extent of this margin is not really known to the
user.
Therefore it is impossible for the user to determine
along with any degree of confidence if the outcome of exceeding the limits
arranged by the engine manufacturer is going to be relatively harmless or
possibly disastrous.
Although the engine handbook contains important
information about the lubricating oil and specifies crucial requirements and
constraints, the essential principles rarely differ:
It is therefore not possible for the user to find out
with any degree of self-confidence whether the outcome of exceeding the bounds
set by the engine producer will be relatively harmless or even potentially
disastrous.
Although the powerplant manual contains important
information concerning the lubricating oil and identifies key requirements and
limitations, the fundamental principles rarely vary:
•
The viscosity of the lubricating oil must remain inside certain
prescribed limits. Usually, oil viscosity increases throughout operation. If it
decreases, this might signify an ingress involving low viscosity fuel. Improved
or decreased viscosity may result in improper lubrication and energy
distortion.
•
The oil should never contain excessive amounts of drinking water or
insoluble foreign contaminants as their effects become progressively harmful
during operation, leading to poor lubrication and mechanised damage.
•
The oil should be capable of protecting the components from the engine
from corrosion due to aggressive chemicals. The ability in the oil to neutralise
acid compounds is termed the entire Base Number (TBN) or perhaps, alternatively,
the Base Number (BN). The TBN of lubricating oil generally decreases together
with use. Acidic corrosion might occur if the TBN drops below the threshold
specified through the manufacturer of the lubricating necessary oil, resulting
in excessive wear and also reducing the life of the components.
•
The flash point on the lubricating oil should stay within the range set
from the manufacturer. A flash stage lower than specified may symbolize the
presence of lighter hydrocarbons, perhaps indicating that the oil continues to
be affected by diesel fuel.
During operation, the lubricating olive oil normally
passes through physical filters to extract strong foreign particles, and
centrifugal separators to remove other harmful particles and water. It is
essential which both are inspected and taken care of entirely in accordance with
manufacturer’s directions.
The viscosity, flash level and TBN of lubricating oil
can only be renewed by a full or incomplete oil change.
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