Description
Technical Overview & Product Details
The second compression ring acts as a vital backup for the No. 1 ring. It is designed to handle the intermediate pressures that escape past the top ring and is typically shaped (often with a tapered or stepped face) to help scrape oil off the cylinder liner, preventing it from migrating upward into the combustion chamber. The 146673-22140 is manufactured with high-strength metallurgy to withstand the heat and mechanical stress found in the middle region of the piston.
- Compatible Engine Type: Yanmar marine propulsion and auxiliary engine series.
- Part Number / Designation: 146673-22140.
- Component Type: Compression Ring No. 2 (Second Piston Ring).
- Material: Hardened, wear-resistant alloy with specialized surface finish to facilitate oil scraping and provide long-lasting sealing.
- Application: Second piston ring groove.
Key Features & Performance
- Secondary Gas Seal: Provides a necessary secondary barrier that reduces the amount of combustion pressure reaching the oil control ring.
- Oil Control: Features a specific geometry (often a scraper profile) that wipes excess oil from the cylinder wall, significantly reducing oil consumption and minimizing smoke and carbon deposits.
- Pressure Management: Helps maintain the stability of the pressure “cushion” between the first and second rings, reducing the tendency of the top ring to flutter at high RPMs.
- Durability: Engineered for high heat resistance, ensuring the ring maintains its tension and shape even as the piston experiences extreme thermal expansion.
Why Source from Heybeli Marine?
Improperly functioning second rings can lead to excessive oil consumption and accelerated carbon fouling of the top ring. Heybeli Marine protects your vessel’s performance with:
- Strict OEM Interchangeability: Our 146673-22140 rings are manufactured to match the exact tension, thickness, and profile specifications required for Yanmar diesel engines.
- Global Strategic Logistics: We maintain a large inventory of these rings, ensuring you can quickly complete your engine overhaul without the risk of parts-related delays.
- Quality Assurance: Every batch is verified for precise end-gap tolerance and radial tension to ensure reliable sealing upon installation.
- Complete Overhaul Support: We provide these rings alongside the No. 1 ring and oil control rings, offering complete, factory-spec piston ring kits.
Technical Maintenance Note:
Proper installation of the 146673-22140 is essential for optimal engine operation:
- Orientation: Unlike the top ring, the No. 2 ring often has a specific profile. Always ensure the “TOP” mark faces the piston crown. Installing this ring upside down is a common cause of high oil consumption.
- End-Gap Inspection: Measure the end-gap of the new ring inside the cylinder liner according to your Yanmar manual’s service limits.
- Cleanliness: Ensure the No. 2 ring groove is completely free of carbon. A “sticky” No. 2 ring cannot perform its oil-scraping function, leading to immediate oil usage issues.
- Expander Use: Always use a calibrated ring expander tool. Excessive bending will permanently deform the ring, resulting in poor radial tension and reduced service life.