Class 2 (2nd Engineer) MEKM 📅 Dec 2020

Exam Question

(a) Explain the factors you would consider in deciding whether to open up a cylinder unit for overhaul? After opening the unit and preparing for assembly, how would you decide whether to renew or re-use piston rings?

(b) List the causes of piston ring failure which may result in gas leakage or ring breakage.

Reference Answer

(a) Factors to consider when deciding whether to open up a cylinder unit for overhaul:
If a Planned Maintenance System (PMS) is in use onboard, the running hours of the engine components are typically the primary factor in deciding when to open up a cylinder unit. The overhaul is scheduled based on the predetermined intervals specified by the manufacturer or the PMS.
Significant reduction in compression pressure and peak pressure, as evidenced by the indicator card diagram, indicates that the cylinder unit's performance has degraded.
If there is a crack in the liner or cylinder head, then the cylinder unit is immediately inspected and repaired.

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