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The M104 Mercedes Engine is a 6-cylinder in-line engine used in the Mercedes-Benz M102, M111, and M120 series of vehicles. The M104 engine was introduced in 1986 and was in production until 1999. The M104 engine is known for its smoothness, quiet operation, and good fuel economy. The M104 engine is available in different configurations, including 2.0M104, 2.6L M104, 3.0L M104, and M104 m.
2.0 M104 Mercedes Engines:
The 2.0 M104 engines are the smallest M104 engines. They have a displacement of 1998cc and have been used in smaller vehicles like the C-Class and E-Class. The 2.0 L M104 engines produce less power and are suitable for lighter vehicles.
2.6L M104 Engines:
The 2.6 M104 engines have a displacement of 2600cc. They offer a good balance between power and fuel efficiency. The 2.6 M104 engines are used in the C-Class, E-Class, and SLK-Class models.
3.0L M104 Engines:
The 3.0 M104 engines have a displacement of 2998cc. They are the most powerful M104 engines, offering the highest power output. The 3.0 M104 engines are used in larger vehicles like the S-Class and SL-Class.
M104 Engine Variants:
The M104 engine has several variants, including the M104.900, M104.901, M104.902, and M104.903. The M104.900 is the basic version of the M104 engine. The M104.901 has a higher compression ratio and tweaked cylinder head. The M104.902 has a turbocharger, and the M104.903 is an intercooler engine.
The M104 engine has six cylinders in line and is water-cooled. The cylinder bore is 80 mm, and the piston stroke is 78 mm. The total displacement varies depending on the version, ranging from 2.0 to 3.2 liters. The cylinder head has two valves per cylinder, with a total of 12 valves in the M104 12V version and 24 valves in the M104 24V version. The valves are actuated by a single overhead camshaft (SOHC) in the M104 12V version and by twin overhead camshafts (DOHC) in the M104 24V version. The engine block is made of cast iron, and the cylinder head is made of aluminum alloy. The M104 engine utilizes a wet sump lubrication system and has an oil cooler for engine oil cooling. The cooling system includes a water pump and a thermostat to regulate the coolant temperature. The fuel system is based on multi-point fuel injection (MPI), with an electronic control unit (ECU) to manage the engine's air-fuel mixture. The ignition system uses a distributor or coil-on-plug (COP) system, depending on the version. The M104 engine has a compression ratio ranging from 9.0 to 10.5:1, which affects its power output and fuel efficiency.
Adhering to the following maintenance tips for the M104 engine will keep it healthy and running smoothly.
Engine Oil
Regular oil changes are essential for M104 mercedes engine maintenance. The oil should be changed every 5,000 miles. Using high-quality oil is recommended to ensure proper lubrication and engine protection.
Coolant
The cooling system also needs regular maintenance. The coolant should be changed according to the manufacturer's recommendations, usually every 2-4 years or 50,000-100,000 miles. This ensures optimal performance and protects against corrosion and freezing.
Air Filter
The air filter should be inspected and replaced every 15,000-30,000 miles or as needed. A clean air filter ensures optimal engine performance and fuel efficiency by providing adequate airflow and preventing dirt and debris from entering the engine.
Spark Plugs
Depending on the type of spark plugs used in the M104 engine, they should be inspected and replaced every 60,000-100,000 miles. New spark plugs ensure optimal ignition and combustion, improving engine performance and fuel efficiency.
Fuel System
The fuel system should be maintained by using high-quality fuel and adding fuel system cleaners periodically. This helps keep the fuel injectors clean and functioning properly, ensuring optimal engine performance and fuel efficiency.
Timing Belt
M104 engines use a timing chain instead of a timing belt. The timing chain should be inspected and adjusted as needed according to the manufacturer's recommendations. This ensures proper engine timing and prevents potential engine damage. The timing chain tensioner and guides should also be inspected and replaced if worn or faulty.
Oil Filter
The oil filter should be replaced with every oil change. A new oil filter prevents dirt and debris from entering the engine oil, ensuring proper engine lubrication and protection.
When buying an M104 engine, here are some key points to consider:
Condition
The state of the M104 Mercedes engine is vital. Look for engines with little mileage on them for better execution and unwavering quality. Actually, examine the engine for indications of consumption, rust, or any actual harm. Peruse the service records to check whether the engine has had standard support, like oil changes and channel substitutions.
Compatibility
Ensure the M104 engine is viable with the vehicle's make, model, and year. This data can be tracked down in the vehicle's manual or on the web. Check whether the engine will fit into the vehicle and interface with things like the transmission, cooling, and exhaust frameworks.
Performance and modifications
Consider the degree of execution the purchaser needs from the engine. Distinctive M104 engines produce changing measures of pull and torque. Some may likewise have changes, for example, another admission or exhaust framework that gives more energy. Discuss with the purchaser about their objectives for things like speed increase, efficiency, or generally speaking driving feel.
Professional Inspection
Take the engine to a skilled mechanic before buying it. The technician will examine the engine's health, including its compression, ignition system, and major components, to ensure they function properly. The mechanic will also perform tests to check for any oil or coolant leaks. Getting a professional opinion can help avoid costly repairs later.
Cost and warranty
Compare prices for the M104 engine from different sellers. Remember that the most affordable option may not be the best deal. The engine may need more repairs or maintenance in the long run. Explore warranties for added protection. Some retailers offer limited coverage, while others provide longer or more extensive coverage.
Whether it's a Mercedes M104 2.8 engine or M104 3.2 engine, replacing it is a complex task that requires specialized knowledge and tools. It is advisable to leave the task to qualified personnel. However, here are some general steps that would be taken to replace an M104 engine if attempted in a DIY capacity.
Q1: How long does the Mercedes M104 engine last?
A1: The M104 engine can last a long time with regular maintenance. Factors like driving conditions and habits affect its lifespan. The M104 engines last between 200,000 and 300,000 miles. The lifespan can be achieved through proper care and timely repairs.
Q2: What is the common problem with the M104 engine?
A2: The M104 engine has a few known issues. The problems include faulty ignition coils, head gasket failures and oil leaks. The issues mostly occur in older models. Mercedes M104 engines have good reliability records, but the problems can affect reliability if not addressed on time.
Q3: How powerful is the M104 engine?
A3: The M104 engine's power varies based on the model and specifications. The six-cylinder engine offers power between 150 and 220 horsepower. The engine provides adequate power for smooth driving and acceleration.
Q4: Is the M104 engine turbocharged?
A4: The m104 engines are not originally turbocharged. Some models have a turbocharged variant. The turbocharged engine provides more power and efficiency. The modifications are done by aftermarket tuners.
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