7 Advantages of the MR504LB3 Engine: Powerful and Compact Marine Solution for 2025.
MR504LB3 – a compact 4-cylinder 2.0 L marine engine with Common Rail, FGT turbocharger, and dual cooling system. Discover its advantages and best applications.
Comprehensive MR504LB3 Engine Guide for 2025.
The MR504LB3 is one of the most modern and reliable marine engines, designed to ensure efficient operation in various sailing conditions. Due to its compact size, low weight, economy, and powerful technologies, it is widely used in smaller and medium-sized yachts and boats. The engine is highly reliable, making it highly valued by both recreational and commercial vessel owners.
What is the MR504LB3 engine?
Purpose and design
The MR504LB3 is a diesel 4-cylinder marine engine with a 2.0-liter displacement block. Its design is made for easy maintenance, with stable operational features even in challenging marine conditions.
Technical structure of MR504LB3
4-cylinder configuration
This layout ensures high-quality combustion, optimal consumption, and excellent power distribution.
Compact 2.0 L block
The compact size means easy installation and less space inside the vessel – important for small and medium-sized boats.
Injection system
Common Rail technology
The engine uses a high-pressure Common Rail system that controls fuel injection with maximum precision.
High-pressure advantages
More efficient combustion
Lower fuel consumption
Reduced emissions
Quieter operation
Distribution and valve system
Single camshaft
The SOHC solution simplifies mechanics and increases reliability in long-term operation.
Toothed timing belt
The timing belt reduces noise and vibrations and facilitates maintenance.
Turbo and air supply
FGT turbocharger
Fixed Geometry Turbocharger ensures:
stable airflow,
quick response,
smooth power increase.
It is ideal for marine vehicles requiring speed and stability.
Cooling system
Dual fresh and saltwater circuits
Such circuits protect the engine from overheating and corrosion – crucial when sailing in salty water.
Easy maintenance
Removable hoses allow quick access to key components and simplify servicing even in confined spaces.
Reliability and operation
Balancing shafts
Balancing shafts significantly reduce vibrations, making sailing more comfortable and extending engine life.
Advantages of MR504LB3
Energy efficiency
Economical fuel use allows for longer sailing than with engines of similar power.
Eco-friendliness
Due to optimized combustion, the MR504LB3 meets much stricter emission standards.
Who is the MR504LB3 engine suitable for?
Boats 18–30 feet in size
Suitable for sports, recreational, and fishing boats.
Yachts 20–35 feet
Ideally suited for small motor and combined (sail + engine) yachts.
Also perfectly suited for:
RIB type boats
Commercial coastal vessels
Inspection and service boats
FAQ
1. Is the MR504LB3 suitable for saltwater?
Yes, due to the dual cooling system.
2. Is the engine economical?
Yes, Common Rail reduces consumption by up to 15%.
3. Is maintenance easy?
Yes, removable hoses allow quick access to components.
4. What is the engine’s lifespan?
Often exceeds 10–15 years with proper maintenance.
5. Is the FGT turbocharger reliable?
Yes, it is designed for stable and long-term marine operation.
MR504LB3 (115 HP) and MR504LS3 (130 HP) are suitable for these types:
Recreational motor yachts
Yachts for coastal trips
Light cruising yachts
Why?
Compact, quiet operation, economical, and powerful enough for this segment of vessels.
