Cylinder Liners: Diameter Tolerance ±0.005 mm

Component Specifications

Definition

Cylinder liners, also known as cylinder sleeves, are cylindrical components that fit into the bore of an engine block to provide a durable, wear-resistant surface for piston rings to seal against. They serve as the primary interface between the piston assembly and the engine block, containing combustion pressures while minimizing friction and wear. These components are critical for maintaining compression, controlling oil consumption, and ensuring proper heat transfer from combustion gases to the cooling system.

Working Principle

Cylinder liners work by creating a precisely honed cylindrical surface that guides piston movement while containing high-pressure combustion gases. During engine operation, the liner provides a low-friction surface for piston rings to slide against, maintaining a gas-tight seal that prevents blow-by. The liner transfers combustion heat to the engine block and cooling system while withstanding thermal expansion and mechanical stresses from piston side forces.

Materials

Typically made from cast iron alloys (gray iron, ductile iron, or alloyed cast iron) or steel alloys. Common materials include: - Gray cast iron with 3.0-3.5% carbon for good wear resistance - Chromium-molybdenum alloyed cast iron for enhanced durability - Aluminum-silicon alloys with nickel coating for lightweight applications - Plasma-transferred wire arc (PTWA) coated steel for advanced applications

Technical Parameters

Parameter	Typical range	Notes & selection driver
Hardness	180-250 HB
Concentricity	≤0.01 mm
Wall Thickness	1.5-3.0 mm
Length Tolerance	±0.1 mm
Surface Roughness	Ra 0.2-0.8 μm
Diameter Tolerance	±0.005 mm

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 6621-3, ISO 6624, DIN 9760, SAE J431

Parent Products

This component is used in the following industrial products

Automotive Engine Blocks

The main structural component of an internal combustion engine that houses the cylinders, crankshaft, and other critical components.

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Engineering Analysis

Risks & Mitigation

Improper installation leading to coolant leaks
Inadequate surface finish causing excessive oil consumption
Thermal stress cracking from overheating
Cavitation erosion from coolant pressure fluctuations
Wear beyond tolerance limits reducing compression

FMEA Triads

Trigger: Insufficient lubrication during break-in period
Failure: Scoring and galling of liner surface
Mitigation: Implement proper break-in procedures with specific lubricants and controlled operating conditions

Trigger: Coolant contamination with combustion gases
Failure: Cavitation erosion and pitting
Mitigation: Regular coolant system maintenance and use of proper coolant additives

Trigger: Excessive piston side forces
Failure: Liner distortion and ovality
Mitigation: Ensure proper piston-to-bore clearance and connecting rod alignment

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Diameter tolerance ±0.005 mm, surface finish Ra 0.2-0.8 μm, hardness 180-250 HB

Test Method

Coordinate measuring machine (CMM) for dimensional verification, surface profilometer for roughness measurement, Brinell hardness testing, pressure testing for wet liners

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Cylinder Liners

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Anhui Leading Forklift Parts Co., Ltd.

Shenyang, Liaoning, CN

Also makes: Engine Assembly, Mast assembly, Hydraulic Steering Cylinder and 9 more

Listed on the company's own website · profile compiled by CNFX from public sources

Listed there as: “Cylinder Liners Kits”
View source page ↗ leadingforkliftparts.com · checked 2026-09-16

View profile Send enquiry

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the difference between wet and dry cylinder liners?

Wet liners have direct contact with engine coolant, providing better heat transfer but requiring precise sealing. Dry liners are pressed into the engine block without coolant contact, offering simpler installation but potentially less efficient cooling.

How often should cylinder liners be replaced?

Cylinder liners typically last 200,000-300,000 miles in normal operation but should be inspected during major engine overhauls. Replacement is necessary when wear exceeds manufacturer specifications, scoring is visible, or compression loss occurs.

What causes cylinder liner failure?

Common failure causes include improper installation, inadequate lubrication, coolant contamination, thermal stress from overheating, cavitation erosion, and abrasive wear from contaminated oil or air.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Cylinder Liners