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Difficulty: MediumSequential Detail Extraction

Read the passage below:

Before maintenance personnel test a newly reconditioned tactical vehicle turbocharger, they must complete a sequential pre-lubrication procedure to protect the floating bearings. First, mechanics fill the turbocharger oil inlet cavity with clean synthetic motor oil. Next, they manually rotate the compressor wheel by hand to verify smooth shaft rotation and coat the internal journals. After confirming free movement, technicians crank the engine with the fuel shutoff valve closed until oil pressure registers on the auxiliary gauge. Finally, once steady oil flow is confirmed, the fuel valve is reopened, and the engine is started at idle speed.

Based on the passage, arrange the following steps of the turbocharger pre-lubrication procedure in the correct chronological order from first to last.

  1. 1Fill the turbocharger oil inlet cavity with clean synthetic motor oil.
  2. 2Manually rotate the compressor wheel by hand to coat internal journals.
  3. 3Crank the engine while keeping the fuel shutoff valve closed.
  4. 4Reopen the fuel shutoff valve and start the engine at idle speed.

Answer

The correct chronological order is: (1) Fill the turbocharger oil inlet cavity with clean synthetic motor oil, (2) Manually rotate the compressor wheel by hand to coat internal journals, (3) Crank the engine while keeping the fuel shutoff valve closed, and (4) Reopen the fuel shutoff valve and start the engine at idle speed.
The chronological sequence is determined directly by textual transitional cues: filling the inlet cavity occurs first ('First'), manual rotation of the compressor wheel occurs second ('Next'), cranking the engine with the fuel valve closed occurs third ('After confirming free movement'), and reopening the fuel valve to start the engine occurs last ('Finally').

Step-by-Step Solution

1
Identify the initial milestone in the procedure.
Mechanics fill the turbocharger oil inlet cavity with synthetic motor oil.
The explicit sequence transition 'First' designates filling the inlet cavity as the initial action.
2
Locate the second step immediately following cavity filling.
Mechanics manually spin the compressor wheel by hand.
The chronological cue 'Next' indicates manual rotation occurs right after oil is added.
3
Determine the action taken after verifying free rotation.
Technicians crank the engine with the fuel shutoff valve closed to register oil pressure.
The transition 'After confirming free movement' places cranking without fuel as the third stage.
4
Identify the terminal stage of the procedure.
Technicians reopen the fuel valve and start the engine at idle speed.
The transition 'Finally' indicates reopening the fuel valve and starting the engine constitutes the closing step.

Key Concept

Sequential detail extraction from technical maintenance procedures using explicit chronological markers.
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Sequential Detail Extraction

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