Yanmar N165 Piston Ring
Mega Marine supplies genuine and reconditioned piston ring for Yanmar N165 marine engines, along with complete engines and a comprehensive range of spare parts. Fast RFQ response and global delivery.
Piston rings are precision-engineered sealing components fitted in machined grooves around the piston circumference. In marine 2-stroke engines, typically three or more rings are used per piston — upper rings for gas sealing and lower rings for oil control. They must maintain a gastight seal throughout the engine service life despite extreme temperatures, pressures, and thermal cycling.
Function in the Engine
Primary gas sealing to prevent combustion blow-by, oil film control to regulate lubricating oil consumption in the liner, heat transfer from the piston crown to the cylinder liner and cooling water circuit.
About the Yanmar N165
165mm bore Yanmar engine for smaller generator and propulsion applications in workboats and harbour craft.
Common Issues Requiring Replacement
Ring wear and loss of tension causing increased blow-by, ring breakage from detonation or scuffing, groove wear on piston lands, micro-seizure from insufficient cylinder lubrication, corrosive wear from sulfurous combustion products with high-sulfur fuels.
Mega Marine supplies genuine OEM and quality reconditioned piston ring for Yanmar N165 engines, with full traceability and global shipping to any port worldwide. We respond to quote requests within 4–6 hours.
- Engine Brand
- Yanmar
- Engine Model
- N165
- Part Category
- Piston Ring
- Condition
- Genuine & Reconditioned
Browse the full N165 parts range.
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