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Scraper Ring Marine Engine Spare Parts is a critical core sealing and scraping component for marine diesel engines. Made of high-quality wear-resistant and corrosion-resistant materials, it scrapes off excess oil on the piston rod and prevents oil leakage and gas blow-by inside the cylinder. It features precise dimensional accuracy, stable structural performance and excellent fatigue resistance, suitable for routine servicing, shipyard overhaul and fault repair under marine harsh working conditions. A well-matched scraper ring stabilizes engine lubrication condition, prevents oil carry-over and abnormal combustion, reduces component failure risks and equipment downtime, and ensures efficient and reliable operation of marine engine units. Please provide equipment model, specifications and part number before ordering to confirm compatibility.
S26MC Scraper Ring | MAN B&W Marine Main Engine Replacement Parts
The S26MC Scraper Ring is a high-precision marine-grade oil control core component specially designed for MAN B&W S26MC series two-stroke low-speed marine main propulsion engines. As a critical part of the piston assembly and stuffing box lubrication control system, this segmented scraper ring adopts a sharp-edge precision structure, mainly responsible for scraping excess lubricating oil on the cylinder liner wall and piston rod surface during high-frequency reciprocating operation. It efficiently strips redundant lube oil, drains residual oil back to the crankcase through reserved oil return grooves, and maintains an extremely uniform thin oil film required for normal cylinder lubrication.
Working under extreme marine heavy-load conditions including long-term full-load open-sea navigation, continuous high-temperature cylinder radiation, high-pressure gas scouring and salt-fog corrosion, the scraper ring’s scraping edge will gradually wear and become blunt. Severe wear leads to insufficient oil scraping capacity, excessive cylinder lubricating oil residue, lube oil burning, increased oil consumption, and massive carbon deposit accumulation inside the combustion chamber. It further causes poor piston ring mobility, cylinder liner scuffing, unstable combustion, and main engine power attenuation. Timely replacement with standard S26MC scraper rings restores OEM-level oil control accuracy, optimizes cylinder lubrication status, and ensures clean, efficient and stable main engine operation.
Precision-machined S26MC scraper rings feature sharp integrated scraping edges and uniform elastic tension, maintaining stable oil-scraping performance under full-load and variable-load transient working conditions. The accurate structural design thoroughly removes excess lubricating oil while retaining the optimal protective oil film, effectively solving the common marine engine problems of oil carry-over and oil dilution. It significantly reduces lube oil consumption and inhibits carbon deposit accumulation on piston tops, ring grooves and cylinder walls.
By stabilizing cylinder lubrication balance and eliminating abnormal oil-burning phenomena, this component avoids secondary failures such as piston ring jamming, thermal scuffing, exhaust pipe carbon blockage and turbocharger fouling. It effectively reduces engine operating failures and maintenance frequency, greatly improving the long-term operational reliability, fuel economy and navigation safety of MAN B&W S26MC main engines during long-distance offshore voyages.
This S26MC scraper ring is made of high-purity high-density alloy cast iron with stable metallurgical structure and excellent mechanical rigidity, specially developed for two-stroke marine main engine high-temperature and high-scraping working environments. Adopting integral precision casting, multiple stress relief treatments and high-temperature stabilization annealing processes, the blank eliminates internal porosity and structural deformation, ensuring long-term dimensional stability under alternating thermal loads.
The working scraping edge undergoes high-frequency quenching and hard alloy coating treatment, forming a high-hardness wear-resistant layer with strong resistance to mechanical abrasion and high-temperature gas erosion. The ring body adopts precise segmentation and elastic tension calibration technology to ensure uniform contact pressure with the cylinder wall, avoiding local gaps and oil leakage. All production procedures strictly comply with OEM technical standards and universal marine diesel industry specifications, fully adapting to continuous heavy-duty marine operation cycles.
Quantified Marine-Grade Performance Parameters
Parameter | Specification | Test & Implementation Standard |
Base Material | High-density alloy cast iron with hardened coating | ISO 185:2020 Marine alloy cast iron standard |
Surface Hardness | HB 230-270, high wear resistance | Brinell hardness precision testing |
Dimensional Tolerance | Micron-level precision matching, zero clearance deviation | CMM full-dimensional inspection |
Working Temperature Resistance | Continuous 450°C high-temperature resistant | High-temperature thermal cycle test |
Service Lifespan | 12,000+ hours continuous heavy-load operation | Vessel long-term field operation verification |
Wear Performance | 40% higher wear resistance than ordinary cast iron rings | Comparative reciprocating wear test |
Oil Control Performance | Zero excess oil residue, stable oil film retention | Dynamic lubrication simulation test |
Compliance Standard | Universal marine industrial manufacturing specifications | General marine diesel engine industry norms |
All S26MC scraper rings are precisely machined and inspected in strict accordance with OEM engineering drawings and marine heavy-duty component standards. Key indicators including outer diameter, end gap flatness, scraping edge perpendicularity and elastic tension are controlled within micron-level precision. The ultra-fine finishing process of the working surface ensures smooth contact with the cylinder liner wall, avoiding liner scratching and abnormal abrasion while guaranteeing efficient oil scraping effect.
Every finished scraper ring undergoes strict pre-delivery full inspection, including dimensional tolerance verification, surface hardness testing, flatness calibration and oil scraping performance simulation test. All assembly dimensions and structural interfaces fully conform to original equipment standards, supporting direct drop-in replacement without on-site trimming or secondary processing, effectively improving main engine overhaul quality and post-maintenance operational stability.
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 |
We supply full-series matching marine engine overhaul spare parts, including piston rings, piston assemblies, cylinder liners, stuffing box parts, sealing gaskets, overhaul kits, connecting rod components, fuel system parts and turbocharger accessories, providing one-stop procurement solutions for ship repair and fleet batch maintenance.
Each batch of S26MC scraper rings undergoes full-process standardized inspection, including raw material spectrum analysis, metallographic structure detection, micron-level dimensional calibration, surface hardness testing and oil scraping performance simulation test. All finished products pass strict high-temperature fatigue and wear resistance screening. The batch qualification rate remains stable at 99.7% based on 2025 production data. All inspection records are archived for customer review and dry-dock overhaul audit.
Manufactured in strict compliance with universal marine diesel industry norms and OEM technical specifications, this scraper ring undergoes comprehensive precision factory testing and strict performance screening. It fully satisfies the operational demands of daily vessel navigation, offshore voyage and conventional commercial ship overhauls, serving as a high-quality matching replacement part for marine engine routine maintenance and overhaul projects.
The scraper ring is a core wearable precision component of the S26MC main engine lubrication control system. Long-term high-temperature gas erosion, reciprocating friction wear and salt-fog corrosion will cause blade passivation, tension attenuation and scraping efficiency decline. Replacement is mandatory during major overhauls when excessive lube oil consumption, obvious combustion carbon accumulation or poor oil film control occurs. Installing new standard scraper rings restores original oil scraping and lubrication control performance, balances cylinder operating status, eliminates oil-burning faults, and recovers engine power and fuel-saving efficiency.
Scraper ring inspection and replacement are key routine maintenance items for MAN B&W MC series main engines. Vessels sailing in high-salt fog sea areas and operating with long-term heavy load are prone to accelerated wear of oil control components. Timely replacement prevents lubrication disorder and avoids secondary damage to piston rings, cylinder liners and combustion chamber components, ensuring stable, low-consumption and efficient operation of the main engine during long-distance navigation.
Which engines are compatible with this S26MC scraper ring? It is professionally customized for MAN B&W S26MC series two-stroke marine main engines and universally compatible with mainstream marine main and auxiliary engine models listed above. Please provide the complete engine model or original part number for accurate matching confirmation.
What is the delivery time? Standard S26MC models are in sufficient stock for 7–10 working days fast delivery. Non-standard customized specifications require 7–15 working days of production cycle.
Can you provide customized processing? Yes, we support OEM customization and non-standard production according to customer drawings or sample sizes. All customized products undergo full-dimensional inspection and performance testing before shipment.
What is your warranty policy? 12-month warranty covering material and manufacturing defects. Professional technical support including installation guidance and assembly parameter calibration is provided for all overhaul projects.
What is the MOQ and export packaging? MOQ is 1 unit for in-stock products, with favorable bulk pricing for fleet maintenance batch orders. Standard export packaging adopts anti-rust treatment, moisture-proof wrapping and solid plywood crating, fully adapting to long-distance ocean freight and overseas storage.
