Sunday, November 11, 2012

Day 37 sheet

“Cummins Engine Oil and Oil Analysis Recommendations” service bulletin #3810340

1.       Nine Functions of Oil:


Extreme Pressure Wear Control





Shock Damping

Hydraulic Action

Oil Additives


2.       Six Oil Contaminants:

Combustion By-Products

Acids, Varnish, and Sludge

Abrasives or Foreign Material

Fuel or Coolant




3.       Nine Sets of Data That Must Be Included In Oil Analysis:

Engine model and serial number

Miles and hours of oil use

Miles and hours on engine since new or since rebuild

Oil used (brand name, performance category, and viscosity grade)

Date sample was collected

Engine application

Amount of new oil added since previous oil change

Any recent engine maintenance

Analysis of new (unused oil)


4.       Oil Sample Methods:


Method 1)

The recommended method for collecting an oil sample is to take the sample from a pressurized port while the engine is idling and warm. This method makes sure the oil sample is not stagnant and represents the actual homogeneous oil mixture that is flowing through the engine. A recommended location for sampling is a port that allows pre-filtered oil to be collected.


Method 2)

This method uses a vacuum pump to draw the oil sample out of the oil sump out through the dipstick tube. The sample should be obtained as soon after stopping the engine as possible so the oil is still warm and stratification has not occurred. Do not allow the tube from the vacuum pump to draw oil from the bottom of the oil pan because excess debris will be included and will cause an incorrect oil analysis.


5.       Appendix A

There is a lot of info in this appendix. I’ll have to read it a couple more times to soak in all the info. Basically It gives you a break-down of the contaminants and wear the contaminants are coming from. Depending on the levels of contaminants you can determined if there needs to be a major repair to be done. Cummins Inc doses not recommend that oil analysis be used to determine maintenance intervals. Oil analysis only permits maintenance intervals to be estimated.


6.       11th hour of the 11th day of the 11th month

This is significant because of the major hostilities of World War 1 were formally ended in 1918 with the German signing of the Armistice.8

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