The multi-purpose offshore supply vessel to...

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Question 1 of 2066636eef28f7522a1c51ff52

The multi-purpose offshore supply vessel to which you are assigned is fitted with main propulsion diesel engines of the type shown in the illustration. In terms of valve operating gear, cylinder liner type, and connecting rod type, what statement is true? Illustration MO-0192

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Question 1 of 20

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🔍 Key Concepts

• Valve operating gear – look carefully for a camshaft in the head versus pushrods and rocker arms above the valves. • Cylinder liner cooling – decide whether the coolant is in direct contact with the outside of the liner (wet liner) or in a separate water jacket around a thicker cylinder casting (jacketed liner/dry liner). • Connecting rod arrangement in a V-engine – compare a single big-end per crankpin (conventional rod) with a master/articulated or fork-and-blade style where one rod connects to another (articulated/marine-type rod).

💭 Think About

• In the illustration, trace the path from the camshaft to the valves: do you see long pushrods coming up from low in the block to rocker arms, or does the camshaft itself sit up in the cylinder head right above the valves? • Look at the colored area around the yellow cylinder liner: is the coolant drawn right against the thin liner wall with sealing rings at top/bottom (typical wet liner), or is the liner part of a thicker casting with a surrounding cavity forming a water jacket (jacketed liner)? • Study how the two connecting rods on each crankpin are arranged: are both directly on the crankpin in the same way, or is one main rod on the crankpin with the other pinned to it (indicating an articulated or marine-type arrangement)?

✅ Before You Answer

• Before choosing, be certain whether the cam is in the head (overhead cam) or in the block using pushrods. • Verify from the coolant passages whether the liner’s outer surface is directly exposed to cooling water (wet) or surrounded by a separate water jacket (jacketed/dry). • Confirm whether there is one main connecting rod with a secondary rod attached to it (articulated/marine-type) or each rod is independently mounted on the crankpin (conventional).

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