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Cylinder Liner

Honing is a process used to restore the rough surface of engine liners, which is essential for maintaining lubrication and reducing wear. This is followed by Plateau Honing, which refines the surface to create a flat finish while preserving oil retention. Liner lacquering occurs when a layer of lacquer forms on the liner, leading to loss of oil control and increased wear, primarily due to chemical reactions between fuel and oil at high temperatures.

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56 views4 pages

Cylinder Liner

Honing is a process used to restore the rough surface of engine liners, which is essential for maintaining lubrication and reducing wear. This is followed by Plateau Honing, which refines the surface to create a flat finish while preserving oil retention. Liner lacquering occurs when a layer of lacquer forms on the liner, leading to loss of oil control and increased wear, primarily due to chemical reactions between fuel and oil at high temperatures.

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Honing

Honing is carried out when liner gets glazed and looses it’s rough surface. Rough surface is required so as to sustain lube
oil film so that there is a film between piston rings and liner to reduce friction and wear of both rings and liner.

Honing is carried out by the help of silicon carbide tool which makes the surface rough and there is an
increase in the diameter of the liner. This process of Honing is followed by a process named PLATEAU HONING which
uses flex Jones which is like a brush with fine grains and revolve at a speed of 80-160 rpm. It makes a zig zag profile of 30
degree angle by moving vertically 1m/s which corresponds to about 2 sec for one double movement.

PLATEAU HONING removes only peaks , rough, torn and folded metal left by Honing process. It is called plateau finish as
it is surface profile that resemble a series of plateau with harsh peak removed leaving flat finish with greater bearing area
while maintaining a cross hatch pattern of valley for oil retention.

Liner Lacquering

It is the formation of a layer of lacquer on liner covering the Honing pattern, resulting in loss of oil control. It is mainly found
in highly loaded engine with low sulpher gas oil. Lacquer probably originates partly due to decomposition of alkaline oil
additives and partly due to decomposition at high pressure and temperature.

Phenomenon of Lacquering:-

When the fuel oil comes in contact with lub oil of high alkaline content then fuel react chemically with the alkaline of lub oil
to form lacquer. Now due to high temperature the compound form burns and volatile part of the compound formed gets
evaporated and leaving carbonic hard part. This hard part when rubbed with piston rings gets break and along with it some
particles of liner also breaks leading to wear of liner.

Liner Lacquering

Definition: Liner lacquering is the formation of a layer of lacquer on the liner, covering the honing pattern. This results in
loss of oil control and is commonly found in highly loaded engines using low sulphur gas oil.

Cause: Lacquer forms due to: Decomposition of alkaline oil additives

Decomposition at high pressure and temperature

Phenomenon of Lacquering: When fuel oil (with high alkaline content) contacts lube oil, it reacts to form lacquer.

At high temperatures: Volatile compounds evaporate, leaving carbonic hard deposits.

These hard deposits can break when rubbed with piston rings.

Broken particles may also wear out the liner.

Lacquering in engine context refers to the formation of a hard, shiny, varnish-like layer (called lacquer) on metal
surfaces, especially inside cylinder liners.
In simple terms:

It’s like a sticky or hard coating that builds up due to heat and chemical reactions inside the engine.

It blocks the oil pattern, reduces lubrication, and can cause wear and tear on the engine parts.

Why it happens?

High engine temperature

Reaction between fuel and oil (especially if low-quality or mismatched)

Decomposition of additives in engine oil


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