There are no industry standard tests that evaluate
the performance or the compatibility of aftermarket
additives in finished oil. Aftermarket additives may
not be compatible with the finished oil's additive
package, which could lower the performance of the
finished oil. The aftermarket additive could fail to mix
with the finished oil. This could produce sludge in the
crankcase. Perkins discourages the use of
aftermarket additives in finished oils.
To achieve the best performance from a Perkins
engine, conform to the following guidelines:
• Select the correct oil, or a commercial oil that
meets the “EMA Recommended Guideline on
Diesel Engine Oil” or the recommended API
classification.
• See the appropriate “Lubricant Viscosities” table to
find the correct oil viscosity grade for your engine.
• At the specified interval, service the engine. Use
new oil and install a new oil filter.
• Perform maintenance at the intervals that are
specified in the Operation and Maintenance
Manual, “Maintenance Interval Schedule”.
S·O·S Oil analysis
Some engines may be equipped with an oil sampling
valve. If S·O·S oil analysis is required the oil
sampling valve is used to obtain samples of the
engine oil. The S·O·S oil analysis will complement
the preventive maintenance program.
The S·O·S oil analysis is a diagnostic tool that is
used to determine oil performance and component
wear rates. Contamination can be identified and
measured by using the S·O·S oil analysis. The S·O·S
oil analysis includes the following tests:
• The Wear Rate Analysis monitors the wear of the
engine's metals. The amount of wear metal and
type of wear metal that is in the oil is analyzed.
The increase in the rate of engine wear metal in
the oil is as important as the quantity of engine
wear metal in the oil.
• Tests are conducted to detect contamination of the
oil by water, glycol, or fuel.
• The Oil Condition Analysis determines the loss of
the oil's lubricating properties. An infrared analysis
is used to compare the properties of new oil to the
properties of the used oil sample. This analysis
allows technicians to determine the amount of
deterioration of the oil during use. This analysis
also allows technicians to verify the performance
of the oil according to the specification during the
entire oil change interval.
Fuel Specifications
Fuel Recommendations
To get the correct power and performance from the
engine, use a fuel of the correct quality. The
recommended fuel specification for Perkins engines
is shown below:
• Cetane number 45 minimum
• Viscosity 2,0 to 4.5 cSt at 40 °C (104 °F)
• Density 0.835 to 0.855 Kg/liter
• Sulfur 0.2% of mass, maximum
• Distillation 85% at 350 °C (662 °F)
• Lubricity 460 micrometers maximum wear
scar on “ISO 12156 - 1”
Cetane number
This indicates the properties of ignition of the fuel.
Fuel with a low cetane number can be the root cause
of problems during cold start. This will affect
combustion.
Viscosity
This is the resistance to flow of a fluid. If this
resistance is outside the limits, the engine and the
engine starting performance in particular can be
affected.
Sulfur
High sulfur content of the fuel is not normally found in
Europe, North America, or Australasia. This can
cause engine wear. When only high sulfur fuels are
available, it will be necessary that high alkaline
lubricating oil is used in the engine or that the
lubricating oil change interval is reduced.
Distillation
This is an indication of the mixture of different
hydrocarbons in the fuel. A high ratio of lightweight
hydrocarbons can affect the characteristics of
combustion.
Lubricity
This is the capability of the fuel to prevent pump
wear.
46
SEBU7992-05
Maintenance Section
Fluid Recommendations
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