The oil of a speed control governor on one of your tug's main diesel engines is foaming excessively, and internally governor parts are sticking due to corrosion. What is the most likely cause?
• Effect of water contamination on lubricating oil (foaming, rust/corrosion) • How different contaminants (water vs. solids vs. wrong viscosity) show up in symptoms • Relationship between corrosion of internal parts and the type of contamination present
• Which type of contamination is most directly connected to both foaming oil and internal corrosion at the same time? • Would wrong viscosity or incompatible seals normally create foam and rust, or would they show different symptoms (like leaks, poor speed control, or sluggish response)? • If solids were the main contaminant, what problems would you expect in the governor (think wear, sticking, scoring) and would that normally cause heavy foaming?
• Match the symptom "foaming excessively" with the most typical cause from lubrication theory. • Match the symptom "parts are sticking due to corrosion" with the contaminant most likely to produce rust inside the governor. • Eliminate any option that does not logically explain BOTH symptoms at the same time, not just one of them.
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