Winterthur Gas & Diesel Ltd. X52, Operation Manual

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12.3.4.2 Recommended limits
For particles up to 21
μ
m, WinGD recommends the specification for a 100 ml oil sample in the
system oil as follows:
•
ISO 4406 --/20/17 maximum
This has the meaning that follows:
•
It is not necessary to count particles of a size of smaller than 6
μ
m (R
4
count).
•
A maximum of 1 000 000 particles (class 20) of a size equal to or larger than 6
μ
m (R
6
count)
is permitted.
•
A maximum of 130 000 particles (class 17) of a size equal to or larger than 14
μ
m (R
14
count)
is permitted.
For particles larger than 21
μ
m, you must obey the NAS and SAE AS specification as in Table
12-7 - Recommended NAS limits for an engine with servo oil filter and in Table 12-8 -
Recommended NAS limits for an engine without servo oil filter .
Tab 12-7 Recommended NAS limits for an engine with servo oil filter
Particle size ranges (
μ
m)
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
Tab 12-8 Recommended NAS limits for an engine without servo oil filter
Particle size ranges (
μ
m)
5 to 15 15 to 25 25 to 50 50 to 100 100 to 150
System oil
- Cleanliness class
12 11 9 7 5
- Particles per 100 ml 1 024 000 91 200 4 050 180 8
NOTE:
•
Particle counting has poor repeatability and reproducibility.
•
The method does not determine the nature, hardness or shape of the particles.
•
Use the used oil analysis and particle count data to form a full picture.
X52
AA00-0000-00AAA-030F-A
Operation Manual System oils
Winterthur Gas & Diesel Ltd.
- 450 - Issue 002 2018-11