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

Compatible Models: 6KSLH275, 6GSLH275, 6GSLH300, 6ESLH633, 6KSLH370, 6ZSHC370, 6GSLH370
I. Product Overview
DONGFANG cylinder heads are third-party compatible replacement spare parts independently manufactured by DONGFANG, suitable for Makita marine and industrial diesel engines, and widely used for maintenance and replacement of marine main engines, auxiliary engines, and generator sets.
The cylinder head is a core high-pressure load-bearing component of a diesel engine, continuously exposed to high temperatures, high pressure, and alternating loads during operation. The product’s structural strength, sealing accuracy, and machining quality directly affect the overall operating stability and service life of the engine.
DONGFANG adopts precision casting, heat treatment stabilization, and CNC precision machining processes, combined with standardized factory inspection, to provide stable and cost-effective replacement solutions for marine operating conditions.
II. Compatibility Range and Application Scenarios
Compatible with mainstream Makita marine diesel engine models.
Application scenarios:
•Marine main propulsion power systems
•Marine auxiliary generator sets
•Industrial stationary diesel power equipment
The assembly dimensions can be accurately matched one-to-one based on the engine model, part number, old parts, or drawings provided by customers, achieving non-destructive replacement.
III. Core Product Functions
1. Stable Combustion Chamber Sealing to Maintain Smooth Power Output
Maintains stable cylinder pressure, prevents pressure loss and gas leakage, and ensures continuous and stable operation of the engine unit.
2. Optimized Intake and Exhaust Flow to Reduce Operating Energy Consumption
The air passage structure is reasonably designed to ensure sufficient gas exchange, improve combustion efficiency, and reduce power loss.
3. Precision Fuel Injection Installation Structure for Stable Combustion Conditions
The injector holes are precision-machined to ensure reliable positioning and sealing, reducing problems such as fuel leakage and abnormal combustion.
4. Efficient Circulating Heat Dissipation to Resist High-Temperature Fatigue Damage
The cooling water passage heat dissipation performance is optimized to effectively reduce common high-temperature failures such as thermal cracks and cylinder head deformation.
IV. Dual Material Options for Different Operating Conditions
1. High-Strength Alloy Gray Cast Iron
It provides stable performance and high cost-effectiveness, suitable for routine maintenance of conventional ships and industrial equipment.
2. Compacted Graphite Iron (CGI)
It provides higher strength, toughness, and thermal crack resistance, suitable for heavy-duty, high-load, and long-term continuous operating conditions.
V. Manufacturing Process
•Resin sand precision casting ensures a well-formed internal structure with a low defect rate.
•Aging heat treatment eliminates internal stress, preventing deformation during long-term operation.
•CNC precision machining is applied to core holes and sealing surfaces, ensuring high assembly accuracy.
•Each individual product undergoes dimensional inspection, water pressure testing, air-tightness testing, and anti-corrosion treatment.
Suitable for harsh marine working environments with high salt spray and high humidity.
VI. Improvement of Common Failures
It can effectively improve common issues such as thermal cracks, poor valve sealing, cooling water passage corrosion, injector leakage, and cylinder head deformation, enhancing the overall stability of equipment operation.
VII. Core Advantages of DONGFANG Products
1. High Compatibility Direct Replacement, Shortening Maintenance Time
Dimensions match assembly standards accurately, requiring no modification or grinding, reducing equipment downtime losses.
2. Special Optimization for Marine Operating Conditions
The structural durability is optimized for marine environments with high temperatures, high salt content, and high loads.
3. Full Inspection Before Delivery, Controllable Quality
Each product undergoes multiple pressure tests, air-tightness inspections, and dimensional inspections to prevent potential quality risks.
4. Flexible Supply and Customized Services
Supports sample orders, bulk orders, private labeling, and customized production based on customer drawings and samples.
VIII. Application Fields
Widely applicable to maintenance of main engines for fishing vessels, cargo ships, and engineering vessels;
Covers marine auxiliary engines, generator sets, and backup power systems;
Suitable for maintenance applications of industrial power equipment equipped with Makita diesel engines.

Compliance Disclaimer
The Makita brand and model numbers mentioned on this page are only used for product compatibility description 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, or affiliation relationship with Makita, and is not involved in OEM manufacturing or brand co-branding.
All trademarks belong to their respective brand owners and are used only for compatibility matching purposes.