INDUSTRY COMPONENT

Liner (Cylinder Sleeve)

A cylindrical sleeve that forms the inner wall of an engine cylinder, providing a wear-resistant surface for piston movement.

View Specifications

Component Specifications

Definition
A precision-engineered cylindrical component that serves as the inner lining of an engine cylinder in internal combustion engines. It provides a durable, wear-resistant surface for piston rings to seal against, maintains cylinder geometry under thermal and mechanical stresses, and facilitates heat transfer from combustion gases to the cooling system. Liners are critical for engine longevity, performance, and emissions control.
Working Principle
The liner creates a precisely honed cylindrical bore where the piston reciprocates. During engine operation, it withstands high temperatures (up to 300°C), combustion pressures (up to 200 bar in diesel engines), and frictional forces from piston rings. It transfers heat to the engine block/cooling system and maintains dimensional stability through controlled expansion. In wet liners, it directly contacts coolant; in dry liners, it's press-fitted into the block.
Materials
Typically made from gray cast iron (GG25, GG30), alloy cast iron with chromium, molybdenum, or nickel additives, or aluminum-silicon alloys with nickel plating for lightweight applications. Advanced materials include centrifugally cast iron with controlled graphite structure or composite materials with ceramic coatings for reduced friction.
Technical Parameters
  • Hardness 180-240 HB (Brinell)
  • Cylindricity <0.015 mm
  • Concentricity <0.02 mm
  • Wall Thickness 2-8 mm (varies by engine type)
  • Surface Roughness (Ra) 0.4-1.6 μm
  • Inner Diameter Tolerance H7/H8 (ISO)
Standards
ISO 6621-3, DIN 9760, SAE J343, JIS D 3101

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Liner (Cylinder Sleeve).

cylinder liner engine sleeve wet liner dry liner cylinder bore piston liner engine rebuild liner materials ISO 6621 Liner (Cylinder Sleeve) Liner (Cylinder Sleeve) in Motor Vehicle Manufacturing

Parent Products

This component is used in the following industrial products

Piston/Liner Assembly

A critical reciprocating assembly within a pump's fluid end that creates pressure by moving fluid through displacement.

View Product Details

Engineering Analysis

Risks & Mitigation
  • Cavitation erosion on coolant side
  • Scuffing/galling from insufficient lubrication
  • Thermal stress cracking
  • Corrosion from acidic condensates
  • Improper installation causing distortion
FMEA Triads
Trigger: Insufficient coolant flow or air pockets
Failure: Localized overheating and thermal cracking
Mitigation: Implement proper coolant system bleeding procedures, maintain correct coolant concentration, and monitor temperature sensors
Trigger: Contaminated lubricating oil with abrasive particles
Failure: Accelerated wear and loss of cylinder geometry
Mitigation: Use high-quality filters with proper maintenance intervals, implement oil analysis programs, and ensure clean assembly conditions
Trigger: Improper liner protrusion above block deck
Failure: Head gasket leakage and combustion gas blow-by
Mitigation: Follow manufacturer specifications for liner height measurement and use precision measuring tools during installation

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Bore diameter: IT7 grade (ISO 286), Cylindricity: ≤0.015 mm, Surface finish: Ra 0.4-0.8 μm for running surface
Test Method
Dimensional verification with air gauging or CMM, hardness testing per ISO 6506, surface roughness measurement per ISO 4287, pressure testing for wet liners, microstructure analysis for material verification

Buyer Feedback

★★★★☆ 4.9 / 5.0 (35 reviews)

"Testing the Liner (Cylinder Sleeve) now; the technical reliability results are within 1% of the laboratory datasheet."

"Impressive build quality. Especially the technical reliability is very stable during long-term operation."

"As a professional in the Motor Vehicle Manufacturing sector, I confirm this Liner (Cylinder Sleeve) meets all ISO standards."

Related Components

Isolation Monitor
An automotive BMS component that continuously monitors electrical isolation between high-voltage battery systems and vehicle chassis to prevent electric shock hazards.
Balancing Circuit
Electronic circuit in automotive BMS that equalizes voltage across battery cells to optimize performance and lifespan.
Communication Transceiver
A bidirectional communication transceiver for automotive BMS enabling data exchange between battery cells and control units.
Enclosure
Protective housing for automotive battery management systems ensuring safety, thermal management, and electromagnetic compatibility.

Frequently Asked Questions

What is the difference between wet and dry cylinder liners?

Wet liners have direct contact with engine coolant for better heat transfer but require sealing at both ends. Dry liners are press-fitted into the engine block without coolant contact, offering simpler installation but potentially less efficient cooling.

How often should cylinder liners be replaced?

Replacement depends on wear measurements. Typically, liners last 500,000-1,000,000 km in automotive applications or 10,000-20,000 operating hours in industrial engines. Replacement is needed when wear exceeds 0.1-0.15% of bore diameter or scoring/damage occurs.

What causes cylinder liner failure?

Common causes include abrasive wear from contaminated oil, cavitation erosion from coolant-side pressure fluctuations, thermal cracking due to overheating, corrosion from acidic combustion byproducts, and improper installation leading to distortion.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Get Quote for Liner (Cylinder Sleeve)

Isolation Monitor Lock Nut / Retainer