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

Compatible Models: NY160, N165, N180, EY180, N210, EY220, N260, EY260, N280A, N330, S165, S185, M200L, M220L, RAL170, MAL220, UAL200UT, T240, T260, Z280DT, Z280ET, MF290
I. Product Overview
DONGFANG cylinder heads are high-quality aftermarket replacement parts independently developed and manufactured by DONGFANG. They are compatible with Yanmar series marine diesel engines and industrial diesel power equipment, and are widely used for routine maintenance and failure replacement of offshore fishing vessels, workboats, small commercial vessels, and diesel generator sets.
The cylinder head is a core pressure-bearing and sealing component of a diesel engine, continuously exposed to high combustion pressure, high-temperature thermal cycles, and continuous mechanical vibration during operation. Its structural strength, heat dissipation performance, machining accuracy, and sealing stability directly affect engine power output, fuel economy, and overall service life.
Yanmar power equipment is widely used in small and medium-sized vessels and industrial power fields due to its advantages of compact structure, stable operation, low fuel consumption, and convenient maintenance. It has consistent and strict requirements for spare parts in terms of thermal fatigue resistance, corrosion resistance, and installation compatibility.
Based on independent dimensional adaptation development and process optimization, DONGFANG adopts precision casting, heat treatment stabilization, and CNC precision machining processes, combined with complete factory inspection, to provide global marine maintenance companies, spare parts distributors, and end users with standardized replacement solutions featuring high compatibility, high stability, and high cost performance.
II. Compatible Models and Application Scenarios
DONGFANG compatible cylinder heads can accurately match mainstream Yanmar marine and industrial diesel engine series.
Core Compatible Models:
NY160, N165, N180, EY180, N210, EY220, N260, EY260, N280A, N330, S165, S185, M200L, M220L, RAL170, MAL220, UAL200UT, T240, T260, Z280DT, Z280ET, MF290
Application Scenarios:
•Main propulsion systems of offshore fishing vessels, workboats, inland waterway vessels, and small commercial vessels
•Marine auxiliary generator sets and backup power systems
•Industrial stationary diesel power generation and construction machinery power equipment
The product can be accurately matched one-to-one according to customer engine models, part numbers, old parts, or drawings, achieving direct replacement without modification.
III. Core Product Functions
1. Stable Combustion Chamber Sealing to Maintain Constant Power Output
The high-precision sealing structure reliably withstands high combustion pressure, preventing gas leakage and cylinder pressure loss. It ensures stable compression ratio and smooth power output, effectively improving the fuel consumption performance of Yanmar engines.
2. Optimized Intake and Exhaust Circulation to Improve Combustion Efficiency
The air passage structure is scientifically optimized to ensure sufficient air intake and smooth exhaust discharge. It improves combustion efficiency, effectively reduces daily operating energy consumption, and meets the requirements of fishing vessels operating continuously at sea for long periods.
3. Precise Fuel Injection Positioning for More Stable Combustion Conditions
The injector mounting position is precision-machined as an integrated structure, providing reliable sealing and accurate positioning. It ensures uniform fuel atomization and prevents common failures such as leakage, carbon buildup, difficult starting, and black smoke emissions.
4. Efficient Circulating Heat Dissipation with High Temperature and Corrosion Resistance
The specially optimized cooling water passages provide fast and balanced heat dissipation, effectively removing high temperatures from the combustion chamber and valve areas. The material resistance is optimized for marine high salt spray and high humidity environments, significantly reducing the risk of thermal cracks, cylinder head deformation, and water passage corrosion.
IV. Dual Material Selection for Different Operating Conditions (Full Coverage)
1. High-Strength Alloy Gray Cast Iron (General Best-Selling Model)
It features a stable structure, balanced heat resistance, high machining accuracy, and excellent cost performance. It is suitable for routine maintenance and replacement of most offshore fishing vessels, small cargo ships, marine auxiliary engines, and industrial generator sets.
2. Compacted Graphite Iron CGI (Heavy-Duty Durable Model)
It provides comprehensive improvements in strength, toughness, thermal crack resistance, and thermal fatigue resistance. It is suitable for harsh operating conditions including long-term full-load operation, frequent starts and stops, and extended offshore operation, providing longer service life and extremely low repair frequency.
V. Precision Manufacturing Process
•Resin sand precision casting ensures well-formed internal water passages, air passages, and combustion chambers with low defect rates and good consistency.
•Artificial aging heat treatment releases casting internal stress, preventing deformation and dimensional shifting during long-term high-temperature operation.
•Full CNC precision machining is applied to the fire deck surface, valve holes, injector holes, and mounting holes, ensuring accurate and controllable tolerances.
•Each finished product independently undergoes dimensional inspection, high-pressure water pressure testing, air-tightness testing, and professional anti-rust and anti-corrosion treatment.
Highly suitable for harsh working environments including coastal high humidity, high salt spray, and dusty conditions.
VI. Improvement of Common Failures
It can effectively improve problems such as fire deck thermal cracks, cooling water passage corrosion and leakage, cylinder head surface warping and gasket failure, valve seat sealing leakage, injector hole leakage, power reduction, increased fuel consumption, and black exhaust smoke, significantly enhancing equipment operating stability.
VII. Core Advantages of DONGFANG Products
1. High Compatibility Direct Installation with No Modification Required
Manufactured strictly according to equipment assembly standards, with mounting holes, water passages, and air passages fully matched. No grinding or modification is required, greatly shortening vessel downtime for maintenance.
2. Targeted Optimization for Marine Operating Conditions
Specifically designed for Yanmar offshore fishing vessels, long-term low-speed continuous operation, and high-salt corrosion environments. The thermal resistance, sealing performance, and corrosion resistance are enhanced, providing better durability than ordinary replacement parts.
3. Full Inspection Before Delivery, Stable and Controllable Quality
All products undergo casting inspection, dimensional verification, water pressure testing, and air-tightness testing to prevent quality issues such as water leakage, gas leakage, and assembly deviation.
4. Flexible Supply + Private Label Customization Service
Supports sample trial orders, small-batch replenishment, and large-volume stock exports. Private brand customization services are available to meet the diverse procurement needs of global trade, maintenance companies, and distributors.
VIII. Product Application Fields
Widely compatible with maintenance and replacement of main engines for various offshore fishing vessels, workboats, inland waterway vessels, and small commercial vessels;
Suitable for routine maintenance of marine auxiliary engines, marine generator sets, and backup power systems;
Also covers supporting applications for industrial diesel power generation, construction machinery, and small power equipment maintenance.

Compliance Disclaimer
The Yanmar brand and model numbers mentioned on this page are only used to describe the equipment compatibility range of DONGFANG products and are provided solely as a reference for customer selection.
All DONGFANG cylinder heads are third-party aftermarket replacement parts independently designed, manufactured, and inspected by DONGFANG, and are not original equipment manufacturer (OEM) parts.
DONGFANG has no authorization, cooperation, affiliation, or OEM manufacturing relationship with the Yanmar brand. All trademarks belong to their respective owners and are only used for compatibility identification purposes.