Hello dear friends.
we are using cummins engines KTA50-G3, the oil analysis result show low viscosity (79 on 40c, and 11.8 on 100c).
we couldn`t find the reason for that so have any body faced some issue like that??
Original Post
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Did you check for fuel dilution - not sure what the rest of the oil analysis results say?
The polymer in multigrade engine oils do shear in service.
The polymer in multigrade engine oils do shear in service.
Dear friend,
it is a must to mention what kind of oil you are using for your engine.
i hope this a 40 grade oil and your case would probably be a fuel dilution as RENEWa rightly said.
hope you can reveal more of the oil analysis results.
it is a must to mention what kind of oil you are using for your engine.
i hope this a 40 grade oil and your case would probably be a fuel dilution as RENEWa rightly said.
hope you can reveal more of the oil analysis results.
from the viscosity values i think your oil is 15W40 grade ,see the flash point if there is about 20% drop the reason is fuel dilution ,if not then it will be due to shear of VII used in multi grade oil
If I'm not mistaken this is a generator? If you are using a 15w/40 oil, which I presume you are, this could be due to fuel dilution or shearing of the multigrade oil. Where is this engine operating? Is there an oxidation result in the oil analysis results?
Dear Michelle,
could you explain more abt this shearing in oils.
Regards
could you explain more abt this shearing in oils.
Regards
The viscosity index of an oil can be increased by the addition of certain compounds. Unfortunately these long organic polymers that uncoil when the oil heats up are not completely shear stable i.e. they start to break up when subjected to high shearing forces.
Dear all,
thank you for ur details.
we are using 15w-40 petromin oil.
Michelle:
our generators are operating in saudi arabia and the oxidation result in the oil analysis is almost about 19.00 so does it effect on the viscosity?
Note that, we had this problem befor on same engine, as action we replaced the Fuel Pump and it work ok for 2 weeks and get back to low viscosity.
therefore if the fuel dilution is the reason? what can we do and what can we check / replace if necessary?
Regards,
thank you for ur details.
we are using 15w-40 petromin oil.
Michelle:
our generators are operating in saudi arabia and the oxidation result in the oil analysis is almost about 19.00 so does it effect on the viscosity?
Note that, we had this problem befor on same engine, as action we replaced the Fuel Pump and it work ok for 2 weeks and get back to low viscosity.
therefore if the fuel dilution is the reason? what can we do and what can we check / replace if necessary?
Regards,
Michelle
thanks for this info
thanks for this info
When interpreting results, all factors should be considered together.
Assuming use of a 15W-40 oil then this would suggest 1/ fuel dilution 2/ polymer shear or thirdly and most unlikely in Saudi is the use of 10W-30 .Analysis shows results to be like a 10W-30 with no polymer shear.
For 1/ Check new oil and additive levels and also flash point, compare with used oil results and any history.To achieve this drop in viscosity some fuel has to be present.
For 2/ Polymer shear is unlikely as VI is ~140
Fuel by FTIR well worth checking and also by GC, provided fuel is run , new oil and used oil(expensive)
Oxidation looks moderate but will tend to slightly thicken the oil anyway.
Assuming use of a 15W-40 oil then this would suggest 1/ fuel dilution 2/ polymer shear or thirdly and most unlikely in Saudi is the use of 10W-30 .Analysis shows results to be like a 10W-30 with no polymer shear.
For 1/ Check new oil and additive levels and also flash point, compare with used oil results and any history.To achieve this drop in viscosity some fuel has to be present.
For 2/ Polymer shear is unlikely as VI is ~140
Fuel by FTIR well worth checking and also by GC, provided fuel is run , new oil and used oil(expensive)
Oxidation looks moderate but will tend to slightly thicken the oil anyway.
