Operation
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Winterthur Gas & Diesel Ltd.
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2.3.1 Recommended Limits for ISO 4406 Particle Count
The specification for a 100 ml oil sample is ISO 4406 −−/20/17 maximum in the
system oil downstream of the filter, which means:
D It is not necessary to count particles of a size of smaller than 6 mm (R
4
count)
D A maximum of 1 000 000 particles of a size equal to or larger than 6 mm (R
6
count)
D A maximum of 130 000 particles of a size equal to or larger than 14 mm (R
14
count).
ISO 4406 is only for particles up to 21 mm. For particles larger than 21 mm, the NAS
and SAE AS particle count must be obeyed.
2.3.2 Recommended Limits for NAS and SAE AS Particle Count
For particles larger than 21 mm, WinGD recommends the NAS and SAE AS
specification for a 100 ml oil sample in the system oil as in Table 5.
Table 5: Limits for NAS 1638 and SAE AS 4059 Cleanliness Classes
Particle size (mm or microns)
5 to 15 15 to 25 25 to 50 50 to 100
100 to
150
System Oil
− Cleanliness class 12 11 10 8 5
− Particles per 100 ml
1 024 000
91 200 8 100 360 8
Servo Oil
− Cleanliness class 12 11 8 5 0
− Particles per 100 ml
1 024 000
91 200 2 025 45 0
2.3.3 Servo Oil − Particle Counts
If the particle count is more than the limit given, do a check of the coarse and fine
filters. This will make sure that all filter elements, gaskets and seals are not damaged.
If a high particle count continues and the filters are serviceable, it is possible that an
area of wear in the engine causes an unsatisfactory number of particles. Too many
particles can also go into the system oil if the piston rod gland boxes do not correctly
seal and used cylinder lubricating oil mixes with the system oil.
The purifier removes particles. You must make sure that the purifier is operated at the
correct temperature. Refer to the manufacturers recommendations and make sure
that the flow rate is adjusted to get the best operation.
2017−08
Lubricating Oils
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