Main Engine exhaust valves

Technical Management Main Engine
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What are the most common causes which could result in holes (ie penetration) on the exhaust valve of an electronic ME type m/e cylinder?

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Hello,

Understand that your question refers to conventional, liquid fueled engines; not to dual fueled engines.

Several factors (or combination of them) that could lead to a premature deterioration of the condition of M/E exhaust valve spindles (higher burn away rates) and hence shorter overhauling intervals, are the following:

  • Improper maintenance and operation of the fuel injectors.
  • Prolonged operation at low M/E loads or under circumstances with insufficient scavenge air pressure. Under these conditions the exhaust valve spindle is subjected to higher thermal loads.
  • Bad fuel oil quality.
  • Improper reconditioning / rewelding procedure of the exhaust valve spindle.
  • Inadequate design/material specification of the exhaust valve spindle.
  • Wrong timing.

The above are applicable to mechanically (camshaft) and electronically controlled M/E.

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Thank you for your answer !