fits model: Mariner. make: Mercury. year: 1989–1997.

( Manufacturer Part Number: 9843A-3 ), ( Part Type: Cap )
The Mercury-Mariner 9843A Cap Outboard Engine, specifically the 30-40 horsepower model, is a classic piece of marine machinery that has stood the test of time. This engine, manufactured between 1989 and 1997, is part of the lower end of the Mercury Mariner series and is known for its reliability and power.
The 9843A Cap Outboard engine features a two-stroke, four-cycle design, which is a combination of the simplicity of a two-stroke engine and the efficiency and cleanliness of a four-stroke engine. This design allows for a more compact engine, making it ideal for smaller boats and recreational use.
The engine is equipped with a displacement of 4.35 liters, which provides ample power for boats in this class. The compression ratio is 6.5:1, ensuring efficient combustion and powerful performance. The 9843A Cap Outboard engine also features a single-cylinder design, making it lightweight and easy to maneuver.
The engine is mounted on a 959 Mercury lower unit, which is known for its durability and smooth operation. The lower unit features a gear ratio of 2.15:1, providing a good balance between acceleration and top speed. The 959 lower unit is also equipped with a sealed, lubricated bearing system, which reduces maintenance and extends the life of the unit.
The Mercury-Mariner 9843A Cap Outboard engine also features a carburetor fuel system, which is easy to maintain and provides consistent fuel delivery. The engine is equipped with a manual choke, which allows for easy starting in cold weather.
The 9843A Cap Outboard engine is also known for its ease of maintenance. The engine features a simple, easily accessible spark plug location, making routine maintenance a breeze. The engine is also equipped with a convenient oil drain plug, which makes oil changes quick and simple.
Overall, the Mercury-Mariner 9843A Cap Outboard engine is a reliable and powerful option for smaller boats and recreational use. Its two-stroke, four-cycle design, lightweight construction, and easy maintenance make it an ideal choice for boat owners who want a powerful and efficient engine that will last for years to come.
Pros of buying a 1989-1997 9843A Cap 30-40hp Mercury-Mariner outboard boat with a 959 Mercury lower end:1. Reliability: Mercury is a well-known and trusted brand in the marine industry, and their 959 lower unit is known for its durability and reliability.
2. Affordability: Older outboard boats can be more affordable than newer models, and this one falls into that category.
3. Easy to repair: Older outboard boats have fewer electronic components and are often easier to repair than newer models.
4. Versatility: This boat can be used for a variety of activities, such as fishing, water skiing, and cruising.
Cons of buying a 1989-1997 9843A Cap 30-40hp Mercury-Mariner outboard boat with a 959 Mercury lower end:1. Age: The boat is older, which means it may have more wear and tear, and may require more frequent maintenance and repairs.
2. Performance: Older outboard engines may not have the same level of performance as newer models, and this one may not be as fuel-efficient or fast.
3. Aesthetics: The boat may not have the same modern styling as newer models, which may not appeal to some buyers.
4. Availability of parts: It may be more difficult to find replacement parts for an older outboard boat, which could make repairs more expensive.
Recommendation:If you're looking for an affordable and reliable boat for leisurely activities, the 1989-1997 9843A Cap 30-40hp Mercury-Mariner outboard boat with a 959 Mercury lower end could be a good option. However, it's important to do your research and have the boat inspected before purchasing to ensure that it's in good condition and that any necessary repairs can be made. Additionally, consider the costs of maintenance and repairs, as well as the availability of replacement parts, to ensure that you're prepared for any potential issues that may arise. Ultimately, if you're willing to put in the time and effort to maintain an older boat, it could be a cost-effective and enjoyable option for you.
Please see included pictures.
Part: 9843A 3 lower end cap assay.
Directly across from Lowe's and 84 lumber. Fits various 40hp Mercury Mercuries inboard and outboard motors.