Description
Technical Overview & Product Details
The oil ring is the final barrier in the piston ring pack. Unlike the compression rings above it, which are designed primarily for gas sealing, the oil ring is engineered for fluid management. It features a specialized structure (typically a multi-piece design consisting of two thin rails and an expander spring) that applies precise radial pressure against the cylinder wall to control the thickness of the oil film.
- Compatible Engine Type: Yanmar marine propulsion and auxiliary engine series.
- Part Number / Designation: 146673-22180.
- Component Type: Oil Control Ring (Oil Ring).
- Material: High-strength steel/alloy rails with a heat-treated expander, designed for durability and consistent tension.
- Application: Bottom piston ring groove.
Key Features & Performance
- Advanced Oil Scraping: Effectively wipes excess oil from the cylinder liner back into the crankcase, which is essential to prevent excessive oil consumption and blue smoke.
- Optimal Film Maintenance: Ensures the correct amount of lubrication remains on the liner to support the piston and compression rings, reducing internal engine friction and heat.
- Vibration Resistance: The integrated expander spring maintains consistent contact with the cylinder wall, even under high-frequency vibrations and varying piston speeds.
- Consistent Tension: Engineered to retain its radial tension over the entire service life of the engine, preventing early failure and oil blow-by.
Why Source from Heybeli Marine?
A degraded oil ring is one of the most common causes of high oil consumption and fouled injectors. Heybeli Marine protects your vessel’s performance with:
- Strict OEM Interchangeability: Our 146673-22180 rings are manufactured to match the exact tension and geometry specifications required for Yanmar engines.
- Global Strategic Logistics: We maintain a large inventory of these essential components to ensure your overhauls are not delayed by missing parts.
- Quality Assurance: Every ring undergoes rigorous inspection to ensure the expander and rails provide a perfect seal across the cylinder circumference.
- Complete Overhaul Support: We provide these rings alongside the No. 1 and No. 2 compression rings as part of complete, factory-spec piston ring kits.
Technical Maintenance Note:
Installing the 146673-22180 requires careful attention to detail to ensure it functions correctly:
- Assembly: If your specific version uses a multi-piece design (rail-expander-rail), ensure the expander spring is correctly seated in the groove without overlapping.
- Rail Stagger: Always ensure the gaps of the oil ring rails are staggered away from the gap of the expander and the gaps of the compression rings above them (typically 180 degrees apart or as per your Yanmar manual) to maintain optimal pressure distribution.
- Cleanliness: The oil ring return holes in the piston must be completely clear of carbon. If these holes are blocked, the oil scraped from the cylinder wall has nowhere to go, and the oil ring will quickly fail, leading to oil consumption.
- Expander Tool: Never force the ring rails over the piston; use a proper ring tool to avoid permanent deformation or breakage.