Exam Question
(a) State the circumstances owing to which it may be necessary to renew a cylinder liner.
(b) Explain how the liner is removed.
(c) Explain how the new liner is fitted.
State the important checks to be made before and after fitting.
Class 2 (2nd Engineer)
MEP
📅 Jun 2018
Reference Answer
(a) There are several circumstances under which it may be necessary to renew a cylinder liner in an engine. One of the primary reasons is excessive wear of the liner, which can lead to issues such as blow past, where combustion gases escape past the piston rings, and incomplete combustion, both of which can affect engine performance
Excessive wear down of liner leads to troubles like blow past incomplete combustion. Liner wear can be of the following types:
Frictional wear: It is due to the sliding over of two surfaces and depends on the speed of movement between surface, material, temperature, load of engine, lubrication, etc
Corrosive wear: it is due to the burning of fuel in combustion space. High sulphur content in fuel oil will lead to the formation of sulphuric acid due to the absorption of condensate/ moisture present inside the combustion space.
Excessive wear down of liner leads to troubles like blow past incomplete combustion. Liner wear can be of the following types:
Frictional wear: It is due to the sliding over of two surfaces and depends on the speed of movement between surface, material, temperature, load of engine, lubrication, etc
Corrosive wear: it is due to the burning of fuel in combustion space. High sulphur content in fuel oil will lead to the formation of sulphuric acid due to the absorption of condensate/ moisture present inside the combustion space.
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