Wichmann AXAG Cylinder Liner

WICHMANN AXAG CYLINDER LINER

The Wichmann AXAG Cylinder Liner is a heavy-duty, centrifugally cast alloy component designed specifically for Wichmann’s 2-stroke, loop-scavenged marine diesel propulsion engines. Engineered to withstand high thermal cycling, mechanical peak pressures up to 135 bar, and abrasive combustion residuals from heavy fuel oil (HFO) and marine gas oil (MGO) operations, this liner features an integrally cast cooling water jacket layout, precision-machined scavenge/exhaust port geometries, and integrated cylinder lubrication quill drillings for uniform boundary layer film distribution.

Model Details

• Engine Type: Wichmann AX / AXA / AXG / AXAG (2-Stroke, In-Line Marine Propulsion Engine)
• Bore Diameter: Ø 300 mm
• Piston Stroke: 450 mm
• Manufacturer Part Number (MPN): WICH-LINER-AXAG-300
• Drawing / Casting Reference: DWG 3AX-2000PS1 / 3V001ES1 series

Technical Specifications: Wichmann AXAG Cylinder Liner

Key Features

1. Centrifugally Cast Lamellar/Compacted Graphite Alloy: Delivers high tensile strength, superior wear resistance against micro-seizures, and optimized thermal dissipation along the top dead center (TDC) zone.
2. Integrally Cast & Precision-Machined Cooling Jackets: Eliminates separate cooling sleeve leak points while optimizing heat flux near the upper ring reversal area.
3. Calibrated Scavenge Porting: Hydrodynamically optimized intake ports maximize loop scavenging efficiency when driven by Root’s engine-driven blowers.
4. Multi-Point Cylinder Lubrication Quills: Evenly delivers alkaline system oil into the piston ring zone to neutralize sulfuric acid formation from high-sulfur residual fuels.
5. Plateau-Honed Internal Surface: Engineered cross-hatch micro-grooving ensures rapid piston ring bed-in, uniform oil retention, and reduced specific lube oil consumption (SLOC).

Applications

• Commercial Fishing Vessels: Pelagic trawlers, stern trawlers, purse seiners, and longliners powered by Wichmann medium-speed engines.
• Offshore Support Vessels (OSV / AHTS): Supply vessels, workboats, and tugboats utilizing AX/AXAG geared propulsion units.
• Coastal Freighters & General Cargo: Direct-drive and reduction-geared propulsion systems in European and global short-sea shipping fleets.
• Stationary / Standby Marine Generators: Specialized power generation platforms utilizing AXA/AXAG drive engines.

Frequently Asked Questions

What is the nominal bore diameter of the Wichmann AXAG cylinder liner?

The nominal bore diameter is 300.00 mm with an operating stroke of 450 mm.

What is the maximum allowable bore wear before the liner must be replaced?

The maximum permissible wear on the internal diameter is 302.40 mm (0.8% of the nominal bore dimension). If ovality at the Top Dead Center (TDC) position exceeds 0.25 mm or deep scuffing/scoring is present, the liner must be remachined to an approved oversize or replaced.

Are Wichmann AXA and AXAG cylinder liners interchangeable?

Yes, Wichmann AXA and AXAG engine types share the same basic engine block cylinder geometry, 300 mm bore, and integral cooling water jacket configuration. However, always verify casting numbers (such as DWG 3AX-2000PS1) and lubrication quill drillings against your specific engine build sheet prior to installation.

How do I prevent water jacket leakage after installing a new liner?

Ensure the landing seats in the engine block are clean of rust and deposits. Install brand new O-rings lubricated with soft soap or silicone paste—never petroleum-based grease. After installation and cylinder head torquing, run a hydrostatic pressure test on the engine cooling water jacket at 4.0 to 7.0 bar to confirm watertight integrity before engine commissioning.

What cylinder oil feed rate is recommended after installing a new liner?

During the running-in period (first 50 to 100 operating hours), increase mechanical cylinder oil lubricator delivery by 25% to 30% above the standard operational setting. Inspect the running surface through the scavenge air ports during crankcase inspections to verify an even, protective oil film before returning to nominal feed rates.