🔍 Key Concepts

• Function of stuffing boxes on crosshead diesel engines and where they are located relative to the piston rod/crankcase • Visual features of a vane type steering gear (hydraulic vanes in a circular housing) versus seal arrangements on a shaft or rod • How scraper rings and sealing rings are arranged in multiple stacked segments to keep oil and gases separated between crankcase and scavenge space

💭 Think About

• Look at the central vertical member in the illustration: what kind of part could that be on a large slow‑speed diesel engine? A rudder stock, a shaft, or a piston rod? • Notice the many stacked rings and the bolted housing around the rod. What is the purpose of having multiple rings in series—supporting weight, transmitting torque, or sealing and scraping fluids? • Ask yourself which option would most likely require a complex, multi‑ring sealing arrangement between two spaces with different oils or gases.

✅ Before You Answer

• Identify whether the device is primarily for sealing and scraping along a reciprocating rod, or for transmitting rotary motion to a rudder or shaft. • Check if a vane type steering gear would normally show radial vanes within a circular chamber rather than stacked rings along a straight bore. • Confirm which listed component (motor mount, steering gear, stuffing box, mechanical shaft seal) would be built with multiple segmented rings and gland followers as seen in the cutaway.