C-10 Repair Rebuild Overhaul Kit LINER KIT 469-5314 238-2710 133-7098 109-5319 C-12 3176C

I. Core Function: Build the foundation of the combustion chamber and ensure the combustion environment

The most core function of the cylinder liner is to form a closed combustion chamber together with the piston, cylinder head and piston rings, providing a stable space for fuel combustion.

Fuel mixes with air in the cylinder liner and burns to generate high-pressure gas, which drives the piston to move back and forth, and then drives the crankshaft to rotate through the connecting rod to output power.

The inner wall of the cylinder liner must have an extremely high degree of smoothness and wear resistance to ensure that the piston rings can fit closely, prevent gas leakage (" blow-by "), and guarantee combustion efficiency. If the cylinder liner is worn or deformed, it will lead to the failure of the combustion chamber seal, resulting in problems such as reduced power and sharp increase in fuel consumption.

2. Key Use 1: Protect the cylinder block and reduce maintenance costs

The cylinder block (engine cylinder block) is the "skeleton" of the engine, usually made of cast iron or aluminum alloy, with a complex overall structure and high manufacturing cost.

The cylinder liner directly withstands the reciprocating friction of the piston, the high temperature (up to over 2000℃) and high pressure (up to 10-15MPa) generated by combustion, functioning as a "sacrificial wear-resistant layer" to prevent direct wear of the cylinder block.

If the wear of the cylinder liner exceeds the limit (such as scratches on the inner wall or excessive ellipticity), only the cylinder liner needs to be replaced, without the need for maintenance or replacement of the entire cylinder block, significantly reducing maintenance costs (the cost of the cylinder liner is only 1/10 to 1/5 of that of the cylinder block).

Iii. Key Use 2: Optimize heat dissipation to prevent engine overheating

If the large amount of heat generated by combustion cannot be dissipated in time, it will cause serious faults such as the engine "boiling over" and piston jamming. The heat dissipation function of the cylinder liner is of vital importance

Cylinder liners are divided into dry cylinder liners and wet cylinder liners (the mainstream models are mostly wet type)

Dry cylinder liner: The outer wall does not directly contact the coolant. Heat is dissipated indirectly through the cylinder block. It has a simple structure and compact size, and is suitable for small engines.

Wet cylinder liner: The outer wall is in direct contact with the coolant, featuring a large heat dissipation area and high heat dissipation efficiency. It can quickly transfer the heat from the inner wall of the cylinder liner to the coolant, maintaining the normal operating temperature of the engine (80-90℃). It is suitable for high-power and high-load engines (such as those of construction machinery and heavy trucks).

Four. Key Use 3: Enhance wear resistance and corrosion resistance

The material of cylinder liners is usually high-strength alloy cast iron (containing elements such as chromium, molybdenum, and boron), and some high-end models adopt chromium plating or nitriding treatment. Compared with the material of cylinder blocks, it has better advantages:

Wear resistance: It can resist the long-term reciprocating friction of the piston rings (the piston can reciprocate 10 to 20 times per second), and extend the service life of the engine (under normal use, the service life of the cylinder liner can reach over 10,000 hours).

Corrosion resistance: Resist the corrosion of combustion products (such as acidic substances) and coolant, prevent pitting and rust spots on the inner wall of the cylinder liner, and ensure sealing performance.

V. Key Use 4: Ensure motion accuracy and maintain the smooth operation of the engine

The processing accuracy of the cylinder liner is extremely high (the roundness and cylindricity errors need to be controlled within 0.005mm), and the honing texture (cross mesh) on its inner wall can store a small amount of engine oil, form an oil film, and reduce the frictional resistance between the piston and the cylinder liner.

Ensure the straightness of the piston's reciprocating motion and avoid abnormal vibrations such as uneven wear and knocking of the piston cylinder.

In coordination with the elastic tension of the piston rings, maintain a reasonable gap (0.02-0.05mm) between the cylinder liner and the piston, ensuring sealing while preventing jamming due to thermal expansion.