The ability of the separator to extract water should also be checked, taking samples from the inlet and outlet pipes and comparing the water content of both thereafter. The tests for water content and viscosity are usually carried out on board by the crew and should be repeated at weekly intervals, recording the results within the planned maintenance system. However, ascertaining whether or not the lubricating oil is acceptable in other respects requires detailed analysis by a specialised laboratorywww.yuchaiie.com