# Main Engine exhaust valves

**URL:** <https://www.queseas.com/t/main-engine-exhaust-valves/340>\
**Category:** Main Engine\
**Tags:** main-engine, cylinder-condition, exhaust-valve\
**Created:** [July 21, 2022, 9:06pm UTC](https://www.queseas.com/t/main-engine-exhaust-valves/340 "2022-07-21T21:06:30Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Mastronikos](https://avatars.discourse-cdn.com/v4/letter/m/9dc877/32.png) [@Mastronikos](https://www.queseas.com/u/Mastronikos)\
**Post date:** [July 21, 2022, 9:06pm UTC](https://www.queseas.com/t/main-engine-exhaust-valves/340/1 "2022-07-21T21:06:30Z")

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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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**Author:** ![Paraschos.Liadis](https://avatars.discourse-cdn.com/v4/letter/p/f0a364/32.png) [@Paraschos.Liadis](https://www.queseas.com/u/Paraschos.Liadis)\
**Post date:** [July 23, 2022, 1:35pm UTC](https://www.queseas.com/t/main-engine-exhaust-valves/340/2 "2022-07-23T13:35:36Z")

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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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<div class="post-metadata">

**Author:** ![Mastronikos](https://avatars.discourse-cdn.com/v4/letter/m/9dc877/32.png) [@Mastronikos](https://www.queseas.com/u/Mastronikos)\
**Post date:** [July 23, 2022, 1:48pm UTC](https://www.queseas.com/t/main-engine-exhaust-valves/340/3 "2022-07-23T13:48:21Z")

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Thank you for your answer !