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Marine Diesel Engine Piston is a precision-engineered engine component installed inside the cylinder liner. It transfers the force generated by fuel combustion to the connecting rod and crankshaft, while supporting stable compression, efficient combustion, and reliable power transmission.
Designed for demanding marine applications, the piston is suitable for main propulsion engines, auxiliary engines, diesel generator sets, engine overhauls, shipyard repairs, and scheduled maintenance projects. It helps maintain stable engine performance, withstand high temperature and pressure, reduce piston-cylinder wear, and extend the service life of the engine.
Please provide the engine brand, model, piston dimensions, piston pin specifications, material requirements, and part number before ordering to confirm compatibility.
HY MARINE Yanmar S165 piston is a core high-temperature and pressure resistant component exclusively designed for YANMAR S165 series marine auxiliary diesel engines. Adopting premium marine-grade hypereutectic aluminum alloy and integral precision forging molding process, each piston undergoes strict high-temperature aging treatment, surface hardening and anode oxidation anti-corrosion treatment. Adapted to the long-term continuous operation, frequent load fluctuation and strong marine vibration of ship auxiliary engines, this piston features ultra-low thermal deformation, high structural toughness and excellent friction resistance. It effectively solves common auxiliary engine faults including piston ablation, ring groove wear, cylinder scuffing, insufficient power and exhaust black smoke. It serves as a perfect OEM replacement part for vessel daily maintenance and engine overhaul, stabilizing auxiliary engine operation and reducing long-term ship operating and downtime losses.
All data below is obtained from standardized factory testing under simulated marine auxiliary engine high-temperature, high-pressure and continuous variable-load operating conditions.
Parameter | Details |
Base material | Marine-grade hypereutectic aluminum alloy |
Forming process | Integral precision forging, one-piece integral molding |
Core component treatment | High-temperature aging treatment, surface hardening, hard anode oxidation |
High temperature resistance improvement | 46% higher than standard Yanmar S165 spare pistons |
Wear & fatigue resistance improvement | 53% higher than ordinary auxiliary engine pistons |
Continuous operation life | 11,500+ hours under continuous marine variable load conditions |
Outer diameter precision tolerance | Within 0.01mm |
Batch qualification rate | 99.7% |
Field operation failure rate | Below 0.3% |
Certification | CCS Type Approval Certificate |
Custom production cycle | 7-15 working days |
All Yanmar S165 marine auxiliary engine pistons adopt 5-axis CNC precision machining and ultra-precision hole finishing technology. Piston outer diameter, pin hole tolerance, ring groove flatness and combustion chamber profile strictly comply with YANMAR original factory OEM standards. High-precision dimensional control ensures zero-jitter matching with cylinder liners and piston rings. It maintains stable reciprocating operation under long-term continuous power generation and variable load conditions, effectively reducing cylinder friction loss, blow-by gas and lube oil consumption. It avoids common auxiliary engine problems such as power instability, speed fluctuation and abnormal vibration during long-voyage marine operation, ensuring continuous and reliable power supply for vessel auxiliary systems.
Every batch of Yanmar S165 pistons completes full pre-delivery inspections, including raw material composition analysis, high-temperature pressure endurance test, full-size dimensional inspection, surface hardness test and long-cycle fatigue simulation test that simulates real ship working conditions. Complete official factory test reports, dimensional inspection datasheets and performance test records are provided with each order. Ship repair teams can conduct direct installation and commissioning without secondary performance testing, effectively saving inspection labor costs and shortening auxiliary engine overhaul and maintenance cycles.
All Yanmar S165 marine pistons are equipped with valid CCS Type Approval Certificate, fully complying with international marine industry technical specifications and ship inspection standards. Both in-stock standard products and customized pistons adopt unified marine-grade quality control standards, fully meeting global vessel inspection and port clearance requirements.
This piston is specially tailored for YANMAR S165 series marine auxiliary diesel engines, also universally compatible with Yanmar N165, NY16 and other 165-series auxiliary engine models. It is widely applied in power generation auxiliary engines of container ships, oil tankers, bulk carriers, harbor tugboats and offshore platform supply vessels. Suitable for new ship construction OEM supporting assembly and old ship auxiliary engine overhaul, routine maintenance and replacement. It effectively eliminates equipment failures caused by piston aging and wear, reduces vessel standby downtime, and ensures stable power supply for ship electrical and hydraulic systems.
MAIN ENGINE | MAN B&W | S26MC,L/S35MC,L/S42MC,L/S50MC,L/S60MC,L/S70MC,L/S80MC,L/S90MC,S46MC-C,S50MC-C,S60MC-C,S70MC-C,S80MC-C,S90MC-C,K90MC-C,K98MC-C,K/L45GF(CA),55GF(CA),67GF(CA),80GF(CA),90GF(CA) |
WARTSILA | 6L20,9L20,8L32,R22,R32,L20,L32 | |
PIELSTICK | PC2-2,PC2-5,PC2-5L,PC2-5V,PC2-6,PA4,PA5,PA6 | |
HANSHIN | EL30-44,ELS-35,44,LH-28G,LU24-54,LUN28AR(G),LUS24-58,LF46-58 | |
NIIGATA | 16HS,16X,18CX,19HX,20AX,25BX,25CX,26AFTE,26KGHS,28AFTE,28BX,28KGHS,31EZ,31X,32CLX,34AFTE | |
SULZER | RTA38,RTA48,RTA52,RTA58,RTA62,RTA68,RTA72,RTA76,RTA84,RL(A/B)56,RL(A/B)66,RL(A/B)76, RL(A/B)90,RND68,RND76 | |
AKASAKA | A31,A34,A38,A41,A45,AH25,AH27,AH28,AH30,AH38,AH40,K28,K31,DM28FD,DM38FD,DM40FD,DM51SS | |
MITSUBISHI | UEC33LSE,UEC37LA,UEC45LA,UEC50LS,UEC52LA,UEC52LS,UEC60LS,UET45/75C,UET45/80D, UET52/90D,UET52/105H | |
AUX.ENGINE | MITSUBISHI | S6A,S6B,S6R,S6N,S16N,S16R,S12R,SA2 |
MAN B&W | 16/24,20/27,21/31,23/30,25/33,28/32,32/40,48/60,58/64 | |
YANMAR | HAL,KL,KDL,KFL,RAL,MAL,S165,S185,M200,M220,T220,T240,T260,Z280,N165,N18,N21,N165,N260,N280, N330,NY16,EY18,EY22,EY26,4CHL,6CHL | |
DAIHATSU | DK20,DK26,DK28,DK32,DL16,DL19,DL20,DL22,DL24,DL26,DL28,DL32,DS18,DS19,DS22,DS26,DS28,DS32, DS40,PK14,PK16,PL24,PL26,PS18,PS20,PS22,PS26,PS30 |
Our Yanmar S165 marine pistons are made of high-purity marine-grade hypereutectic aluminum alloy. After professional high-temperature aging and surface hardening treatment, the product features excellent high-temperature resistance, deformation resistance and wear resistance, perfectly adapting to the long-term continuous operation and variable load working characteristics of Yanmar 165-series marine auxiliary engines.
Yes. This piston is OEM-standard precision replacement part specially developed for YANMAR S165 marine auxiliary engine. All dimensions, groove positions and combustion chamber parameters are completely consistent with original factory specifications. It also supports matching replacement for Yanmar N165, NY16 and other 165-series auxiliary engine models with high versatility.
All our Yanmar S165 pistons are equipped with valid CCS Type Approval Certificate, complying with international marine industry standards and ship inspection specifications. The products can smoothly pass vessel annual inspection, port inspection and ship class audit without compliance risks.
Standard in-stock Yanmar S165 pistons can be shipped within 7–10 working days after payment confirmation. For non-standard modified or custom-processed pistons, the production cycle is 7–15 working days, with stable quality and guaranteed delivery schedule.
Yes. Every batch of Yanmar S165 pistons is delivered with complete factory test documents, including raw material inspection reports, dimensional full-inspection records, high-temperature resistance and fatigue performance test data. Customers can install and commission directly without secondary performance testing to save maintenance time.
Under standard marine continuous variable load working conditions, the piston’s continuous stable service life reaches 11,500+ hours. The batch qualification rate is up to 99.7%, and the field operation failure rate is controlled below 0.3%. It effectively avoids common auxiliary engine faults such as piston ablation, scuffing, power drop and unstable operation, reducing long-term maintenance costs.
