fits model: 500. make: Mercury.

( Manufacturer Part Number: 831-5347A3 ), ( Part Type: Hp Cylinder Block Motor )
The 831-5347a3 Mercury Outboard 50 HP 500 Cylinder Block-Crankcase Powerhead Motor is a powerful and reliable marine engine designed for high-performance applications. This motor features a 500-cc, four-stroke, two-cylinder engine, which delivers a maximum power output of 50 horsepower.
The engine block and crankcase are made of high-quality materials, ensuring durability and long-lasting performance even in harsh marine environments. The cylinder block is designed with a cast iron construction, providing excellent heat dissipation and resistance to corrosion. The crankcase, on the other hand, is made of aluminum, reducing the overall weight of the motor and increasing its efficiency.
The powerhead of this motor is equipped with a high-compression piston and a forged connecting rod, which contribute to the engine's high power output and responsiveness. The engine also features a high-volume oil pump, ensuring that the engine is always adequately lubricated, even under heavy load.
The 831-5347a3 Mercury Outboard 50 HP 500 Cylinder Block-Crankcase Powerhead Motor is also equipped with a digital fuel injection system, which delivers precise fuel injection, improving engine performance and reducing fuel consumption. The engine is also equipped with an electronic ignition system, which ensures reliable ignition and starts, even in wet or humid conditions.
The motor comes with a three-blade propeller, which is designed to provide excellent thrust and maneuverability. The propeller is made of stainless steel, ensuring durability and resistance to corrosion. The engine is also equipped with a gear drive system, which provides smooth and efficient power transfer to the propeller.
In conclusion, the 831-5347a3 Mercury Outboard 50 HP 500 Cylinder Block-Crankcase Powerhead Motor is a powerful and reliable marine engine that is designed to deliver excellent performance, fuel efficiency, and durability. Its high-quality construction, advanced fuel injection system, and electronic ignition system make it an ideal choice for high-performance applications, such as powerboats, jet skis, and other marine vehicles.
Pros of buying a 831-5347A3 Mercury Outboard 50 HP 500 Cylinder Block-Crankcase Powerhead Motor:1. Reliable and durable: Mercury Marine is known for producing high-quality outboard motors, and the 831-5347A3 is no exception. It is built to last and is designed to provide long-term performance.
2. Powerful: With 50 horsepower, this outboard motor has enough power to handle a variety of watercraft, including small to medium-sized boats.
3. Easy to install and maintain: The 831-5347A3 is designed to be easy to install and maintain, which can save you time and money in the long run.
4. Fuel-efficient: Mercury Marine outboard motors are known for their fuel efficiency, which can help you save money on gas over time.
Cons of buying a 831-5347A3 Mercury Outboard 50 HP 500 Cylinder Block-Crankcase Powerhead Motor:1. Expensive: Outboard motors, in general, can be expensive, and the 831-5347A3 is no exception. You may need to budget for this purchase.
2. Requires regular maintenance: Like any mechanical device, the 831-5347A3 will require regular maintenance to keep it running smoothly. This can include regular oil changes, checks of the propeller, and other routine checks.
3. May not be suitable for all watercraft: While the 831-5347A3 is powerful enough for many watercraft, it may not be suitable for larger or more powerful boats. You should consider the specific needs of your boat before making a purchase.
Recommendation:If you are in the market for a reliable and powerful outboard motor, the 831-5347A3 Mercury Outboard 50 HP 500 Cylinder Block-Crankcase Powerhead Motor is a great option. It is built to last, is easy to install and maintain, and is fuel-efficient. However, it is also expensive, so you should budget accordingly. Additionally, you should consider the specific needs of your watercraft to ensure that this motor is the best fit for you. Overall, if the cost and fit are right, the 831-5347A3 is a great investment for your boating needs.
I am selling this for a friend who became frustrated by project. This is a block from an early 70s 50hp Mercury. Eventually he figured out there was rat damage to the electrical system or something like that, but did not want deal with it any more. The lower unit is also for sale.
The powerhead has decent compression, about 130 psi on all 4 cylinders when cranked.