The 3-position, 4-way directional control...

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Question 1 of 2066636eef28f7522a1c51f649

The 3-position, 4-way directional control valve with a 30 bar output at "ee" as shown in the illustration (MO-0116) is a blocking valve associated with the engine turning gear. Which of the following statements describes its function when incorporated into a slow-speed diesel engine starting control air distributor as shown in the illustration (MO-0053)? Illustrations MO-0053 and MO-0116

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Question 1 of 20

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🔍 Key Concepts

• Relationship between turning gear engaged and engine starting safety interlocks • Difference between control air (pilot air) to the distributor and main starting/supply air to the starting valves • How a blocking (interlock) valve in MO-0116 changes the air path to ports "A" and "C" when the turning gear is moved

💭 Think About

• When the turning gear is engaged, should the engine be able to receive starting air to the cylinders? Think about what must be prevented mechanically and pneumatically. • Look at MO-0053: which air actually causes the starting valves at each cylinder to open—control air to the distributor, or the main supply air line? Which one is easier/safer to block? • Trace the air path from the 30‑bar source through MO‑0116: what happens to the connection to port "A" and to port "C" in each of the three positions?

✅ Before You Answer

• Confirm from MO-0053 which port corresponds to control air (pilot air) and which corresponds to start/supply air. • Check, in MO‑0116, which valve position corresponds to turning gear engaged and see whether port "A" or "C" is blocked in that position. • Verify that in the normal running condition (turning gear disengaged), the path needed for a normal engine start (from 30 bar to distributor) is not blocked.

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