Authored by Dunaev AV
This control is always needed before the service of machines
and equipment. For 0.5 hours evaluate the work of oils, prevent
their late change and accident.
Means of verification
The crucible 75.100 ml, thermometer 250 °С, device for the
slow controlled heating of the oil to 220 – 235 °С, filter paper.
Determine the temperature of the beginning and end of
crackling/foaming/boiling oil when it is watered, flash point,
decreasing due to loss of viscosity. An oil stains (“drip sample”,
Figures 1&2) on filter paper after 15 - 20 minutes characterizes
the contamination, washing, dispersing properties, water cut and
overheating of the oil.
Qualitative characteristics of drip samples of motor oils of CC, CD, CF-4, SG-4 quality classes according to API (Figures 1 & 2, Tables 1-3)
1. Almost fresh oil in the new engine worked no more than
50 hours; not contaminated, blurs to the largest size, gives a
uniformly colored light gray spot with a light outer ring of pure
oil.
2. The same, no more than 100 hours; visible core, thin core
ring, wide diffusion zone ring of contaminated oil and the outer
ring of almost pure oil. This is a classic example of “drip sample”
oil with a large margin of performance.
3. Contaminated but have a stock working property worked
oil; it requires regular monitoring to get ahead of the sharp
deterioration of the oil and motor.
4. Oil is visibly contaminated and loses its detergentdispersant
properties (the spot diameter is considerably
decreased, as mechanical impurities enlarged); for Vysocinaprasannah
motors this oil needs to be replaced. If the oil stain
is yellow – the engine overheated and the oil is excessively
oxidized - pitched.
5. Oil - a marriage of emergency motor (oil lost working
properties, and maxprimary formed sludge); it is required to
eliminate the failure (water leaks, etc.), rinse the motor.
As you work, with the watering, increasing the number and size
of mechanical impurities with the loss of the working properties
of the oil, its spot with light gray turns into dark black and steadily
decreases in size. And a drop of dirty, watered (dead) oil from the
engine with an emergency condition does not spread on the filter
paper (matter), as it has a lot of viscous sludge.
None.
No Conflict of Interest.
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