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Rocker Arm Marine Diesel Engine Spare Parts is a critical core power transmission component for marine diesel engines. Made of high-quality wear-resistant and impact-resistant materials, it accurately transfers camshaft motion to open and close engine valves, ensuring proper gas exchange inside cylinders. 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 rocker arm stabilizes engine valve timing, prevents valve actuation failure and power loss, reduces component failure risks and equipment downtime, and ensures efficient and reliable operation of marine diesel engine units. Please provide equipment model, specifications and part number before ordering to confirm compatibility.
MAN Engine 16/24 Rocker Arm | Marine Replacement Parts
The MAN 16/24 Rocker Arm is a core valve train transmission component exclusively designed for MAN 16/24 series four-stroke marine diesel engines. Installed inside the engine cylinder head system, it acts as a precision lever mechanism that transfers camshaft lifting force to intake and exhaust valves. It accurately controls valve opening/closing timing, stroke and movement regularity, ensuring efficient gas exchange and stable cylinder combustion during long-term marine engine operation. As a key reciprocating load-bearing part, it directly determines the engine ventilation efficiency, power stability and exhaust emission status. Severe wear, bending deformation, bushing failure or surface cracking of the rocker arm will lead to valve timing deviation, insufficient cylinder inflation, poor exhaust, power drop and abnormal engine knocking, causing potential operational risks during vessel navigation. Replacing with standard MAN 16/24 rocker arm restores original valve train accuracy and guarantees reliable and continuous operation of marine main and auxiliary engines.
Working under harsh marine operating conditions including long-time full-load continuous operation, frequent cyclic mechanical impact, high-temperature radiation inside cylinder head and ship salt-fog corrosion, the rocker arm and inner bushing will gradually produce friction wear, fatigue deformation and loose matching clearance after long service hours. Damaged rocker arms cause unbalanced valve operation, increased fuel consumption and accelerated wear of camshaft, valve spindle and related valve train parts. Regular inspection and replacement of rocker arms are essential maintenance items for MAN 16/24 engine overhaul and dry-dock repair projects.
This MAN 16/24 dedicated rocker arm adopts integral forging structure with high rigidity and uniform stress distribution, effectively resisting bending and torsion deformation under alternating impact loads. The key matching holes and roller contact surfaces are precision honed and finely ground to achieve ultra-low friction coefficient and excellent wear resistance, ensuring flexible and accurate swing movement during long-cycle operation. It maintains stable valve lift and precise timing without deviation under variable load working conditions.
With outstanding mechanical fatigue resistance and high-temperature structural stability, the rocker arm assembly adapts to frequent start-stop and long-term heavy-load operation of marine generator engines and main engines. It effectively reduces valve train noise, abnormal vibration and component failure rate, stabilizes engine combustion efficiency, lowers daily maintenance costs and greatly improves the long-cycle operational safety and reliability of MAN 16/24 marine diesel engines.
The MAN 16/24 rocker arm is manufactured from high-grade forged alloy steel, specially customized for the high-frequency impact and high-temperature working environment of MAN four-stroke marine engines. Integral die forging process eliminates internal porosity and structural defects. Multiple stress relief treatments remove residual forging stress to ensure long-term dimensional stability without deformation. Key friction parts adopt surface strengthening and high-precision honing process to improve surface hardness and wear resistance. The whole manufacturing process strictly complies with MAN OEM technical requirements and universal marine diesel industry standards.
Quantified Marine-Grade Performance Parameters
Parameter | Specification | Test & Implementation Standard |
Core Material | High-strength forged alloy steel | Raw material spectrum inspection |
Surface Treatment | Heat treatment + precision honing + strengthening | Hardness test & surface finish inspection |
Dimensional Tolerance | OEM-level precision matching tolerance | CMM full dimensional inspection |
Mechanical Performance | High rigidity, anti-deformation, anti-fatigue | Cyclic impact fatigue test |
Working Temperature Resistance | Adapt to cylinder head high-temperature environment | High-temperature structural stability test |
Service Feature | Wear-resistant, low friction, stable transmission | Marine long-cycle operation simulation test |
Compliance Standard | Universal marine industrial manufacturing specifications | MAN OEM & marine diesel industry norms |
All MAN 16/24 rocker arms are manufactured strictly in accordance with MAN OEM engineering drawings and marine valve train component standards. Every workpiece undergoes raw material verification, integral forging, heat treatment calibration, precision machining and honing finishing. Key assembly holes, roller fitting surfaces and overall geometric tolerance are fully controlled to ensure perfect coordination with rocker shaft, adjusting screw and valve assembly.
Each finished rocker arm passes strict pre-delivery full inspection, including dimensional accuracy detection, hardness testing, surface defect screening and assembly flexibility test. All technical parameters fully match original equipment standards, supporting direct drop-in replacement without secondary processing, effectively improving 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 spare parts for MAN 16/24 engine overhaul, including rocker shaft, rocker arm bushing, valve tappet, push rod, valve spring, valve retainer, sealing gaskets and complete valve train overhaul kits, providing one-stop procurement solutions for shipyards, shipping companies and marine engine maintenance suppliers.
Each batch of MAN 16/24 rocker arms undergoes full-process professional inspection and performance screening, including raw material spectrum analysis, metallographic inspection, dimensional calibration, hardness testing, surface defect detection and mechanical fatigue test. All inspection records are archived completely for customer review and dry-dock audit.
Manufactured in strict compliance with universal marine diesel industry norms and MAN OEM technical specifications, this rocker arm meets the requirements of daily vessel navigation and engine overhaul projects, serving as reliable replacement spare parts for marine main and auxiliary engines.
The rocker arm is a key transmission component of MAN 16/24 engine valve train system. Long-term high-frequency impact, friction wear and high-temperature aging will cause bushing looseness, surface wear and micro deformation. Replace the rocker arm during major overhaul if unsmooth valve movement, abnormal valve timing or obvious surface wear is detected. Installing new standard MAN 16/24 rocker arm restores precise valve transmission accuracy, optimizes gas exchange efficiency and protects cylinder head and valve train components from secondary damage.
Regular inspection of rocker arm wear and matching clearance is an essential routine maintenance item for MAN 16/24 marine engines. For vessels with long-term continuous power operation, valve train parts are prone to fatigue wear. Timely inspection and replacement can effectively avoid valve failure, power attenuation and excessive fuel consumption, ensuring stable and safe operation of shipboard power equipment.
Which engine does this rocker arm fit?
This rocker arm is specially customized for MAN 16/24 series marine diesel engines, also compatible with multiple mainstream marine main and auxiliary engine models listed above. Please provide complete engine model or original part number for accurate matching confirmation.
What is the delivery time?
Standard MAN 16/24 rocker arms are in stock with 7–10 working days fast delivery. Non-standard customized specifications support 7–15 working days production cycle.
Can you provide customized processing services?
Yes, we support OEM customization and non-standard processing according to customer drawings and samples. All customized products undergo full-dimensional inspection and mechanical performance testing before shipment.
What is your warranty policy?
12-month warranty for material and manufacturing defects. We provide professional after-sales technical support including installation guidance and assembly parameter verification.
What is the MOQ and export packaging?
MOQ is 1 unit for in-stock products, with favorable bulk discount for fleet batch orders. Standard export packaging adopts anti-rust oil treatment, moisture-proof wrapping and solid plywood crating, adapting to long-distance ocean transportation and overseas storage.
