SL2023-738/IKCA Sampling of scavenge drain oil

Controlling wear rates and good cylinder conditions are essential for optimising component service life and overhaul intervals.
The cylinder condition must be monitored by performing a monthly visual inspection through the scavenge air ports and by acquiring a scavenge drain oil analysis (SDA) from an accredited laboratory

every third month or 1,500 running hours. In addition, it is recommended to supplement the laboratory SDA by doing onboard SDAs at short intervals (100–200 running hours).
By monitoring the cylinder condition closely, the cost of ownership can be reduced by:
– Optimising the cylinder oil feed rate
– Wear control
– Optimising overhaul intervals
This Service Letter addresses:
– Drain oil sampling
– Drain oil analysis

Evaluation of analysis results from accredited laboratories ashore Methods for onboard drain oil analysis
Recommended values and dilution
– Sweep test
– Recommended schedules for drain oil sampling.