TP-7070 7/18 81Section 3 Scheduled Maintenance
3.6.3 Oil Analysis
The engine oil analysis interval varies for different
engines, applications, and oil types. Refer to the Engine
Operation and Maintenance Manual for oil analysis
intervals.
Follow the procedures and recommendations in this
section to ensure that samples provide a good
representation of the engine oil condition. Always use
the same procedure for oil sampling to allow reliable
comparisons.
In extreme conditions, perform the oil analysis more
frequently. For example:
D In extreme climates
D When the generator set is subject to repeated starts
D When the engine is running for a long time on low load
D If there is high sulphur content in the fuel (from 0.5 to
1.5% by weight)
Some signs that the oil is no longer carrying out its
function may include:
D Unusually large deposits or precipitations on the
inside of the engine and its components such as
filters, centrifuges or separators, in particular when
compared with the previous analysis
D Unusual discoloration of components
As a precaution, also send a bottle containing a new oil
sample which will serve as a reference point for the
analysis of the used oil.
Sampling Point
Sampling is carried out at a representative point in the
system, preferably just after the machine is shut down.
D Always sample at the designated sampling point(s).
See the engine Operation Manual for the
recommended sampling point.
D Failing this, sample via the dipstick well with a syringe
and flexible hose.
D As a last resort, sample directly from the sump drain
point after draining the dirty fluid at the bottom of the
sump.
Preparation of Sampling Point
In order to avoid contaminating the sample:
D Carefully clean the sampling point and the sampling
equipment before each sample is taken and before
opening the system.
D If possible, avoid environmental disturbances when
taking the sample (wind, dust, rain,...).
The laboratory-supplied bottle should be filled to 3/4 full.
In the absence of a laboratory-supplied bottle, make
sure there is a minimum amount of 125 ml (4.3 oz.).
Use an appropriately labeled and cleaned bottle. Some
important points to note during sampling are:
D Oil brand and type
D Sampling date
D Equipment type and serial number
D Operating hours since commissioning (startup)
D Operating hours since oil change
D Sampling type: during draining or during a sampling
D If oil was added (topped up) since the last oil change,
indicate how many liters (quarts) were added.
D Interventions carried out
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