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Zichai L250-01-049 Cylinder Liner Sealing Ring

Zichai L250-01-049 Cylinder Liner Sealing Ring

Heybeli Marine is a trusted global supplier of class-approved, high-precision marine engine components. The Zichai L250-01-049 Cylinder Liner Seal (commonly designated as the cylinder liner O-ring or water jacket sealing ring) is a critical elastomeric barrier engineered to maintain absolute fluid isolation within the Zichai L250 engine block.

When managing top-end overhauls, the integrity of these static elastomeric rings is paramount. The O-ring must maintain its strict circular cross-section and material elasticity under constant compression, establishing an unyielding seal between the wet-type cylinder liner outer wall and the internal landing bores of the engine crankcase.

Category: Brand: Product ID: 19298

Description

Technical Overview & Product Details

In medium-speed four-stroke marine diesel engines like the Zichai L250 series (including the 6L250, 8L250, and LC9250 platforms), the wet cylinder liner (L250-01-068) is directly surrounded by high-velocity jacket cooling water. The lower section of the liner slips into the engine block guide bores right above the oil sump.

The L250-01-049 seal is positioned within the precision-machined grooves of the lower liner landing zone. Its primary role is to prevent high-temperature jacket water from escaping down into the crankcase—where it would instantly emulsify the lubricating oil and destroy the main bearings—while simultaneously keeping pressurized crankcase oil mist out of the cooling system.

  • Compatible Engine Type: Zichai L250, LB6250, LB8250, 6L250, 8L250, and LC9250 series four-stroke medium-speed marine diesel engines.
  • Part Number / Designation: L250-01-049 (Seal of Cylinder Liner / Liner O-Ring).
  • Component Type: Engine Block and Cylinder Liner Critical Fluid Seal.
  • Material Compound: Premium Fluoroelastomer (FKM / Viton) or high-grade hydrogenated nitrile matrix featuring high chemical and thermal resistance.
  • Operational Temperature Threshold: Sustained structural performance up to 150°C.

Key Features & Performance

  • Excellent Resistance to Compression Set: Constant exposure to high mechanical squeeze and high temperatures causes standard rubber to harden and lose its elasticity (compression set). Our L250-01-049 seals are formulated with premium polymer cross-linking that retains “spring-back” sealing force across thousands of running hours.
  • Jacket Water Chemical Defense: Marine cooling water is continuously treated with chemical corrosion inhibitors, anti-scaling agents, and glycol-based additives. The FKM/Viton chemical architecture of this seal ensures it will not swell, soften, or degrade when exposed to these harsh water-treatment environments.
  • Lube Oil and Fuel Barrier: The lower edge of the seal faces aggressive hot lubricating oil mist and unburnt fuel fractions blowing down past the piston. The advanced compound mix offers an outstanding barrier against swelling and cracking caused by chemical interactions with petroleum products.
  • Optimal Hardness and Elasticity: Configured with a carefully balanced Shore A hardness rating. This ensures the ring is soft enough to deform perfectly into micro-irregularities along the engine block bore, yet tough enough to resist being pinched or sheared during liner installation.

Why Source from Heybeli Marine?

A failed liner seal can quickly trigger an engine room emergency, leading to water-in-oil alarms, rapid oil filter clogging, bearing wiped surfaces, and full engine shutdowns. Heybeli Marine minimizes your operational risk with:

  1. Exacting OEM Geometric Alignment: Our Zichai-compatible sealing rings match factory tolerances for inner diameter and cross-sectional thickness, eliminating the danger of loose fits or over-compression.
  2. Global Strategic Fleet Inventory: We maintain deep stock allocations of Zichai L250 cylinder liner seals and overhaul o-ring kits across major maritime logistics channels for immediate, 24-hour dispatch to your vessel or agent.
  3. Comprehensive Matching Rebuild Kits: We supply the L250-01-049 seal alongside matching upper fire rings, cylinder cover gaskets (L250-01-045), cylinder liners (L250-01-068), and complete piston ring sets.
  4. Verified Batch Quality Control: Every seal batch undergoes rigorous dimensional checks and oven-aging testing to ensure perfect operational reliability under high mechanical torque profiles.

Technical Maintenance Note: When overhauling a cylinder unit and installing the Zichai L250-01-049 liner seal, meticulous cleaning is mandatory. Carefully scrape away all rust scale, hard lime deposits, and old rubber residue from the engine block landing grooves. Always inspect the new O-ring for any surface defects or nicks before fitting. Never twist the ring inside its groove during assembly. To prevent the seal from clipping, cutting, or rolling out of its track when lowering the heavy cylinder liner into the block, thoroughly lubricate both the seal and the block guide bore using soft soap or a specialist rubber-compatible lubricant—never use standard heavy mineral grease, which can swell and degrade certain rubber compounds.

Additional information

Brand

Zichai
Model

L250-01-049

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