Description
Technical Overview & Product Details
“Bore polishing” occurs when hard carbon deposits accumulate on the top of the piston and wear down the cylinder liner’s honing pattern, leading to increased oil consumption, “blow-by,” and loss of compression. The 146673-01131 is installed at the top of the cylinder liner to act as a mechanical barrier. It has a slightly smaller internal diameter than the liner, scraping off carbon deposits from the piston crown as it passes, thus preventing the accumulation that causes bore polishing.
- Compatible Engine Type: Yanmar marine propulsion and auxiliary engine series.
- Part Number / Designation: 146673-01131.
- Component Type: Anti-Polishing Ring (Cylinder Liner Fire Ring).
- Material: High-grade, heat-resistant alloy steel or specialized cast iron, hardened to resist the abrasive nature of carbon and the extreme temperatures of the combustion chamber.
- Application: Located at the top of the cylinder liner bore.
Key Features & Performance
- Carbon Removal: Effectively scrapes carbon deposits from the piston land area, preventing the buildup that causes liner wear.
- Lubrication Efficiency: By maintaining the cylinder liner’s honing pattern (cross-hatch), the ring ensures that oil remains on the liner walls, reducing friction and wear on the piston rings.
- Compression Integrity: Helps prevent “blow-by” by ensuring the piston rings can maintain a consistent seal against the liner throughout the entire stroke.
- High Thermal Stability: Constructed to withstand the intense heat and pressure cycling of the combustion chamber without deforming or losing its scraping precision.
Why Source from Heybeli Marine?
A worn or missing anti-polishing ring can drastically shorten the service life of your cylinder liners and piston rings. Heybeli Marine protects your vessel’s performance with:
- Strict OEM Interchangeability: Our 146673-01131 rings are manufactured to match the exact internal diameter and hardness specifications required for Yanmar cylinder liners.
- Global Strategic Logistics: We maintain ready-to-ship inventory of these essential engine overhaul components, ensuring they are available for your planned maintenance cycles.
- Quality Assurance: Each ring is precision-ground and inspected to ensure it maintains the critical clearance required to scrape carbon without damaging the piston crown.
- Complete Overhaul Support: We provide these rings alongside cylinder liners, pistons, and ring sets to support professional, comprehensive engine top-end rebuilds.
Technical Maintenance Note:
Installation of the 146673-01131 is a critical step in a top-end overhaul:
- Inspection: Before installation, ensure the groove at the top of the cylinder liner is perfectly clean and free of carbon or debris.
- Seating: The ring must sit perfectly flat in its housing. Any misalignment can lead to contact with the piston, causing catastrophic damage.
- Measurement: Always verify the clearance between the ring and the piston land using the dimensions provided in your specific Yanmar engine service manual.
- Lubrication: Follow the manufacturer’s recommendations regarding whether to install the ring dry or with a specific assembly lubricant.