DONGFANG Cylinder Head | Replacement Spare Parts Compatible with Hanshin Marine Diesel Engines

Compatible Models: 6LUD-26、6LU-26AGHS、6LU-28、6LUN-28、6LUN-28AOA、6LUN-28ARG、6LU-32、6LU-35、6LUD-35、6LU-38、6LUS-38、6EL-30、6EL-32、6EL-35

I. Product Overview
DONGFANG cylinder heads are third-party maintenance replacement spare parts independently developed and manufactured by our company, suitable for maintenance applications of Hanshin marine diesel engines and related power equipment.
The cylinder head is a core structural component of the diesel engine combustion system. It is installed on the upper part of the cylinder block and works together with the piston and cylinder liner to form a sealed combustion chamber. During continuous operation of the engine unit, the cylinder head is subjected to high-temperature and high-pressure combustion, cyclic thermal shocks, and mechanical loads for long periods. Material performance, structural strength, and machining accuracy directly determine the engine’s power performance and long-term operating reliability.
Hanshin series diesel engines are widely used in marine propulsion systems and marine auxiliary engines. They have gained industry recognition due to their robust structure, convenient maintenance, and suitability for long-term continuous operation. Marine power equipment usually requires stable power output over extended periods; therefore, replacement cylinder heads need to have excellent thermal fatigue resistance, reliable sealing performance, and corrosion resistance suitable for marine operating conditions.
DONGFANG cylinder heads are developed through measurement and mapping based on the original structures of corresponding engine models and mold development. They are manufactured using precision casting, heat treatment, and CNC precision machining processes. The product assembly dimensions, structural strength, and operating stability meet the maintenance and replacement requirements of marine diesel engines.
II. Applicable Engine Models
DONGFANG cylinder heads can match multiple Hanshin marine diesel engines and serve maintenance applications for marine propulsion systems, marine auxiliary diesel engines, marine generator sets, and industrial diesel power equipment.
Applicable model list:
6LUD-26, 6LU-26AGHS, 6LU-28, 6LUN-28, 6LUN-28AOA, 6LUN-28ARG, 6LU-32, 6LU-35, 6LUD-35, 6LU-38, 6LUS-38, 6EL-30, 6EL-32, 6EL-35
Different engine models have significant differences in valve structures, combustion chamber designs, and cooling system layouts. Customers can provide engine models, original part numbers, physical samples, or drawings, and our company will assist in accurate matching to ensure that installation dimensions meet on-site assembly requirements.
III. Main Functions of Cylinder Head
Maintain Combustion Chamber Sealing and Ensure Stable Marine Power Output
Hanshin diesel engines are commonly used in marine power systems requiring long-term uninterrupted operation. The cylinder head withstands combustion pressure and maintains effective combustion chamber sealing, ensuring continuous and stable engine operation.
Optimize Gas Exchange and Improve Fuel Combustion Efficiency
The cylinder head integrates key components such as intake passages, exhaust passages, and valve seats. It precisely controls intake air and exhaust gas discharge, improves combustion efficiency, and enhances the operating economy of the engine unit.
Support Fuel Injection Components and Ensure Stable Injection Conditions
The injector mounting base on the cylinder head provides precise positioning and sealing capability, ensuring stable fuel injection, improving engine starting performance, and optimizing combustion results.
Dissipate Combustion Heat and Improve Long-Term Operating Stability
Through internal cooling water circulation passages, heat from the combustion area is effectively removed, reducing cylinder head thermal stress and minimizing risks of cracks, deformation, and other high-temperature damage caused by long-term operation under high temperatures.
IV. Optional Material Solutions
Based on the operating conditions of Hanshin marine diesel engines, two mature material options are provided:
High-Strength Alloy Gray Cast Iron
It features good casting stability, balanced heat resistance and machinability, and outstanding cost performance.
Applicable scenarios:
Routine maintenance and replacement of Hanshin marine diesel engines and marine auxiliary power equipment.
Compacted Graphite Iron (CGI)
It provides higher mechanical strength, excellent thermal fatigue resistance, and crack resistance.
Applicable scenarios:
Marine diesel engines operating continuously for long periods under high-load conditions, effectively extending cylinder head service life.
V. Manufacturing Process
Resin Sand Precision Casting
Precisely forms internal cooling water chambers, intake and exhaust passages, and internal reinforcement structures, improving casting quality and reducing casting defects such as pores and shrinkage cavities.
Artificial Aging Heat Treatment
Eliminates residual internal stress generated during casting, improves dimensional stability under long-term high-temperature operating conditions, and reduces thermal deformation.
CNC Precision Machining
Completes precision machining of the fire deck surface, valve holes, injector holes, and various mounting holes. Critical dimensions are matched according to the assembly standards of corresponding engine models.
Anti-Rust Treatment and Complete Inspection
Finished products undergo surface anti-rust treatment. Each unit sequentially completes dimensional inspection, water pressure resistance testing, and air-tightness testing to ensure stable sealing performance and adaptability to complex marine corrosion environments.
VI. Common Failure Reference
Thermal Cracks on Combustion Surface
Caused by long-term high-load operation of diesel engines, reduced cooling system efficiency, and concentrated cyclic thermal stress, which may affect combustion pressure stability.
Valve Seat Wear / Burning
Long-term exposure to high-temperature combustion gas impact causes reduced valve sealing performance, resulting in reduced power output and lower combustion efficiency.
Cooling Water Chamber Corrosion
The combined effects of marine salt, coolant quality, and long-term operation may reduce cooling capacity and cause leakage in severe cases.
Leakage at Injector Installation Position
Caused by sealing surface wear or insufficient machining accuracy, which may result in fuel leakage and abnormal engine operation.
VII. Advantages of Choosing DONGFANG Cylinder Heads
Developed Through Original Engine Structure Measurement to Meet Maintenance Replacement Requirements
Installation dimensions are verified and matched with high accuracy, reducing adjustment time during marine maintenance and enabling quick replacement.
Specially Optimized for Long-Term Marine Operating Conditions
Optimization is carried out in material selection, machining accuracy, and sealing structure to enhance heat resistance and long-term operating reliability.
Standardized and Complete Quality Inspection Process
Each product undergoes casting appearance inspection, precision dimensional inspection, water pressure testing, and air-tightness testing to reduce operational and maintenance risks for end users.
Flexible Supply Model
Supports sample confirmation, small-batch purchasing, and large-volume export supply, providing stable supply for long-term cooperating distributors.
Customized and Private Label Services
Products can be developed according to customer drawings, samples, and technical requirements, supporting customized molds and private brand packaging solutions.
VIII. Application Fields
Marine Main Propulsion Power Systems
Suitable for replacement and maintenance of Hanshin diesel engines installed on commercial ships, fishing vessels, engineering workboats, and inland waterway transport vessels.
Marine Auxiliary Power Equipment
Including marine diesel generator sets, auxiliary diesel engine systems, and ship emergency power units.
Industrial Diesel Power Systems
Provides reliable replacement spare parts for maintenance markets of various industrial diesel units operating continuously for long periods.

Compliance Disclaimer
DONGFANG cylinder heads are third-party repair replacement spare parts independently manufactured by the company and are not original Hanshin products. The company has no equity affiliation, brand authorization, OEM cooperation, or any other relationship with the Hanshin brand rights holder. The third-party trademarks mentioned herein are only used to objectively indicate the applicable engine models of the products, and all trademarks belong to their respective legal holders.