Yanmar N18 Piston
Mega Marine supplies genuine and reconditioned piston for Yanmar N18 marine engines, along with complete engines and a comprehensive range of spare parts. Fast RFQ response and global delivery.
The piston is the reciprocating component that receives combustion pressure and transmits it to the crankshaft via the piston rod and crosshead assembly (2-stroke) or connecting rod (4-stroke). In large 2-stroke engines, the piston is typically a composite assembly: a cast iron or steel skirt with a separately-attached alloy steel crown. The crown is exposed directly to combustion gases and peak temperatures exceeding 400°C, requiring internal oil or water cooling.
Function in the Engine
Transfers combustion gas pressure to the crankshaft mechanism through the piston rod or connecting rod, seals the combustion chamber in cooperation with the piston rings, provides the machined ring grooves that locate and constrain the piston rings.
About the Yanmar N18
Yanmar N-series 180mm bore medium-speed engine for propulsion and auxiliary applications in smaller commercial vessels.
Common Issues Requiring Replacement
Crown burning and erosion from poor combustion or defective fuel injectors, ring groove wear causing ring instability and increased blow-by, piston skirt scuffing from insufficient diametral clearance or lubrication failure, thermal fatigue cracking of the piston crown, cooling passage blockage or corrosion.
Mega Marine supplies genuine OEM and quality reconditioned piston for Yanmar N18 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
- N18
- Part Category
- Piston
- Condition
- Genuine & Reconditioned
Browse the full N18 parts range.
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