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Zichai L250-01-068 Cylinder Liner

Zichai L250-01-068 Cylinder Liner

Heybeli Marine is a trusted global supplier of class-approved, high-precision marine engine components. The Zichai L250-01-068 Cylinder Liner is a critical, heavy-duty structural component engineered to withstand massive mechanical forces, extreme combustion temperatures, and intensive abrasive wear within the Zichai L250 engine series.

When inspecting the structural architecture of industrial wet-type cylinder liners, look at the precision-machined outer landing shoulders and the distinct cooling grooves cut into the external jacket wall. These features ensure a precise, unyielding press-fit into the engine block cylinder bore, optimizing direct heat transfer to the surrounding jacket cooling water while preventing structural distortion under intense firing pressures.

Category: Brand: Product ID: 19299

Description

Technical Overview & Product Details

The cylinder liner forms the central combustion chamber wall within which the piston assembly cycles thousands of times per minute. In medium-speed four-stroke marine diesel engines like the Zichai L250 series (including the 6L250, 8L250, and LC9250 platforms), the liner must maintain a perfectly cylindrical shape under extreme internal gas pressures exceeding 150 bar, while operating continuously on variable fuel lines—ranging from clean distillates to aggressive, unrefined Heavy Fuel Oil (HFO).

The L250-01-068 part number designates a premium, wet-type alloy cast iron liner. Fabricated using centrifugal casting methods, it features an advanced metallurgical matrix alloyed with boron, phosphorus, and chromium to ensure high resistance against adhesive wear, scuffing, and corrosive acid attack.

  • Compatible Engine Type: Zichai L250, LB6250, LB8250, 6L250, 8L250, and LC9250 series four-stroke medium-speed marine diesel engines.
  • Part Number / Designation: L250-01-068 (Cylinder Liner / Cylinder Sleeve).
  • Component Type: Wet-Type Combustion Chamber Core Component.
  • Nominal Cylinder Bore: 250 mm.
  • Material Base: Centrifugally cast high-phosphorus/boron-alloyed pearlitic gray iron with high micro-hardness.

Key Features & Performance

  • Advanced Plateau Honing Profile: The internal sliding surface undergoes a specialized multi-stage cross-hatch plateau honing process. This creates a surface profile consisting of flat “plateaus” interspersed with deep oil-retention “valleys.” This finish maintains an unbroken lubricating oil film between the liner wall and the piston rings, directly preventing metal-to-metal contact, scuffing, and blow-by.
  • High Strength and Distortion Resistance: The high-tensile structural layout of the liner body easily absorbs the immense lateral thrust loads imposed by the connecting rod mechanism during the power stroke, keeping structural ovality and cloverleafing deformation well within factory specifications.
  • Water-Side Cavitation Protection: The external water-jacket surface is treated with specialized anti-corrosion coatings or deep geometric machining to resist high-frequency vibrations. This active protection mitigates the collapse of vapor bubbles (cavitation erosion) caused by the rapid expansion and contraction of cooling water against the liner wall.
  • Acid Corrosion Defense: Heavy fuel oils containing high sulfur contents generate corrosive sulfuric acid during combustion. The precise chemical balance of phosphorus and alloyed elements in our L250-01-068 liner forms a resilient protective matrix that neutralizes cold-end acid corrosion along the lower stroke line.

Why Source from Heybeli Marine?

Worn, polished, or out-of-round cylinder liners lead to immediate power loss, high lubricating oil consumption, severe blow-by into the crankcase, and a high risk of catastrophic piston seizure (scuffing). Heybeli Marine safeguards your vessel’s operational safety and machinery assets with:

  1. Exacting OEM Dimensional Integrity: Sourced from top-tier marine foundries utilizing high-end multi-axis machining tools, our liners guarantee 100% geometric matching, correct calibration clearances, and uniform wall thickness.
  2. Global Strategic Logistics: We maintain continuous stock of Zichai L250 main engine components across strategic international maritime corridors, ensuring rapid, 24-hour dispatch to primary dry docks, ports, and freight forwarders.
  3. Comprehensive Overhaul Integration: We supply the L250-01-068 liner along with all matching top-end accessories, including specialized rubber sealing O-rings (L250-01-069 / 070), the cylinder cover gasket (L250-01-045), complete piston assemblies, and matched piston ring sets.
  4. Rigorous Testing Standards: Every single liner undergoes non-destructive testing (NDT), ultrasonic flaw analysis, hydrostatic pressure leak testing, and surface roughness verification before being approved for distribution.

Technical Maintenance Note: When executing a cylinder unit overhaul and fitting a new Zichai L250-01-068 cylinder liner, absolute cleanliness within the engine block receiver bore is paramount. Thoroughly scrape and clean the upper and lower landing surfaces of the block to remove scale, varnish, and old O-ring debris. Always fit brand-new, original-specification rubber sealing rings into the lower grooves and apply a thin layer of specialized lubricant to prevent ring twisting or clipping during insertion. Before lowering the liner into position, verify the landing shoulder flatness using a dial indicator to prevent uneven stress concentrations or water-jacket distortion after the cylinder head is tensioned.

Additional information

Brand

Zichai
Model

L250-01-068

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