Exam Question
With reference to exhaust valves:
(a) Describe how valves are reconditioned. (8)
(b) Explain how valve timing is checked and corrected. (8)
Class 4 (4th Engineer)
MEP
📅 Aug 2022
Reference Answer
### (a) Reconditioning of Exhaust Valves (8 Marks)
The reconditioning of a marine diesel engine exhaust valve is a meticulous process aimed at restoring its geometry and material properties to the manufacturer's original specifications. This process is critical for ensuring gas-tight sealing, efficient heat transfer, and longevity. The procedure is as follows:
**1. Preparation and Initial Inspection:**
* **Cleaning:** The valve spindle and seat are thoroughly cleaned, typically by sandblasting, to remove all carbon deposits, scale, and combustion residues. This ensures a clean surface for accurate inspection.
The reconditioning of a marine diesel engine exhaust valve is a meticulous process aimed at restoring its geometry and material properties to the manufacturer's original specifications. This process is critical for ensuring gas-tight sealing, efficient heat transfer, and longevity. The procedure is as follows:
**1. Preparation and Initial Inspection:**
* **Cleaning:** The valve spindle and seat are thoroughly cleaned, typically by sandblasting, to remove all carbon deposits, scale, and combustion residues. This ensures a clean surface for accurate inspection.
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