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Zichai L250-02-014 Crankshaft Thrust Plate

Zichai L250-02-014 Crankshaft Thrust Plate

Heybeli Marine is a trusted global supplier of class-approved, high-precision marine engine components. The Zichai L250-02-014 Thrust Plate (conventionally known in marine engineering as the crankshaft thrust washer, thrust pad, or axial positioning ring) is a heavy-duty engine component engineered to original equipment parameters. It is specifically designed to manage the axial clearance (end-play) of the crankshaft, absorbing heavy longitudinal thrust forces and ensuring perfect structural alignment within the Zichai L250 engine series.

When inspecting the design of these precision thrust plates, look closely at the semi-circular segmented layout and the specialized radial oil grooves machined into the running face. These grooves are strategically profiled to distribute pressurized lubricating oil across the contact zone, ensuring an unbroken hydrodynamic oil film can form even under heavy longitudinal thrust loads from the propulsion shafting or flywheel.

Category: Brand: Product ID: 19311

Description

Technical Overview & Material Architecture

While main bearing shells support the radial (downward and upward) forces generated during the power stroke, the crankshaft also experiences persistent axial (forward and backward) forces. These forces are introduced by propeller thrust transmitted through the intermediate shafting, the weight of the heavy flywheel, thermal expansion of the crankshaft body, and the action of helical timing gears.

The L250-02-014 thrust plate acts as a sacrificial, high-durability wear barrier positioned within a machined recess on the main engine bedplate saddle webs (typically surrounding the guiding main bearing station). To resist severe friction, boundary contact during engine startup, and mechanical shear, our thrust plates employ an advanced multi-layer composite matrix:

  • Rigid Steel Backing Core: Provides excellent structural rigidity and a perfectly flush press-fit against the stationary engine block housing web.
  • Intermediate Copper-Lead Layer: Delivers exceptional fatigue resistance and high thermal conductivity to pull intense frictional heat away from the rotating contact face.
  • Precision Anti-Friction Coating: A soft galvanic overlay that offers outstanding conformability and embeddability, safely holding any microscopic particles that make it past the oil filters.

Key Features & Performance Benefits

  • Micro-Calibrated End-Play Control: Maintains the crankshaft’s axial movement within strict factory tolerances. This limits horizontal shifting that could cause severe timing gear misalignment, connecting rod twist, or uneven piston skirt tracking along the cylinder liner.
  • Optimized Hydrodynamic Wedge Form: The oil slots utilize a wedge-shaped profile that pulls oil underneath the rotating crankshaft shoulder. This keeps the components separated by a microscopic cushion of oil, minimizing boundary friction and preventing severe localized scuffing.
  • Anti-Rotation Locking System: Machined with precise locating tabs or dowel holes that anchor the plate firmly into the bedplate recess, preventing any accidental rotational spinning or displacement during operations.
  • High Scuffing and Cavitation Defense: Specially alloyed to handle sudden, high-load thrust changes, preventing surface spalling, overlay delamination, or tearing during rapid engine maneuvering.

Why Source from Heybeli Marine?

Worn or out-of-tolerance thrust plates allow excessive crankshaft end-play. This creates heavy vibration, damages adjacent main bearings, causes severe oil pressure drops, and can result in the crankshaft counterweights striking internal crankcase walls. Heybeli Marine secures your commercial fleet operations with:

  1. Exacting OEM Dimensional Matching: Sourced from world-class maritime bearing foundries utilizing advanced multi-axis CNC grinding systems, our plates guarantee 100% physical and operational interchangeability.
  2. Global Supply Chain Logistics: We maintain continuous stock of Zichai L250 lower block and crankshaft accessories across key international trade corridors, ensuring rapid, 24-hour dispatch to your shipyard or agent.
  3. Comprehensive Overhaul Integration: We supply the L250-02-014 thrust plate alongside matching upper and lower main bearing bushes (250-02-093), connecting rod bearings, and full crankcase overhaul gasket sets.
  4. Flexible Thickness Options: Along with standard (STD) factory dimensions, we offer precision oversized thicknesses to compensate for any wear or re-machining on the crankshaft’s thrust shoulders.

Technical Installation Note: When overhauling the Zichai L250 crankshaft assembly and fitting new L250-02-014 thrust plates, absolute attention must be paid to orientation. The thrust plates are directional components; the smooth steel backing must sit dry and completely flat against the stationary bedplate housing web, while the grooved alloy face must look outward to interface with the rotating crankshaft shoulder. Installing a plate backward will destroy the assembly within minutes due to immediate metal-to-metal friction and oil starvation. After installation, always use a magnetic base dial indicator mounted on the engine block to measure the total axial float (end-play) of the crankshaft, ensuring it falls perfectly within the manufacturer’s specified range before closing the crankcase side doors.

 

Additional information

Brand

Zichai
Model

L250-02-014

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