How is lubrication provided to the device...

🔍 Key Concepts

• Study the small detail view showing items #11 and #12 and trace where any piping or passages lead in relation to the bearing surfaces. • Recall how large thrust bearings / line shaft bearings on main propulsion shafts are usually lubricated (gravity-feed or low‑pressure circulating oil vs. special high‑pressure systems). • Consider whether special synthetic oils or extremely high‑pressure systems are normally required for this type of marine shaft bearing.

💭 Think About

• From the illustration, does item #11 look like an oil supply arrangement feeding the working faces, or something else? What does #12 appear to represent? • If this device were using an extremely high‑pressure hydrostatic system, what extra components (pumps, accumulators, piping) would you expect to see sketched, and do you see them here? • Think about whether the thrust/line shaft bearing for a slow‑speed diesel is usually tied into the main engine sump and lube system, or completely separate with exotic lubricants.

✅ Before You Answer

• Verify which parts of the bearing are clearly in contact with oil and whether there is an obvious inlet path and drain path for lube oil. • Check whether the drawing or choices mention any special oil type requirement and ask yourself if that matches standard marine practice for these bearings. • Compare the arrangement to a normal line shaft bearing lubrication diagram in your notes and decide if this looks essentially the same or something fundamentally different.

How is lubrication provided to the device shown in the illustration? Illustration MO-0120

The lube oil enters through the supply pipes shown as #11 and eventually drains to the main engine sump.

Only silicate ester based synthetic oils have the capability and necessary characteristics to be used in this type of application.

A separate system containing oil under extremely high-pressure is used due to its ability to provide a high film strength.

The lubrication system closely resembles the system used with standard line shaft bearings.

🔍 Key Concepts

💭 Think About

✅ Before You Answer