Om402 engine

Types of OM402 Engines

The OM402 engine is a 6-cylinder in-line diesel engine series that was produced by Mercedes-Benz from 1968 to 1990. The OM402 engine is a heavy-duty engine mainly used for trucks, buses, and industrial machines. The OM402 engine is known for its reliability, durability, and high torque output, which make it suitable for demanding applications. The OM402 engine generates a maximum power of 110 to 200 kW (150 to 272 hp) and a maximum torque of 480 to 1,000 Nm (354 to 738 lb-ft).

There are three main types of the OM402 engine:

• OM402A

  The OM402A is a V6 engine. It has a compact and lightweight design for its 6-cylinder. The six cylinders are arranged in a V-shape, similar to how a V8 or V10 engine is designed. The OM402A engine is used in applications that require a compact engine with a smaller footprint, such as in some buses and trucks. The OM402A engine has a lower weight and better power output compared to the inline 6-cylinder engine.

• OM402B

  The OM402B is an in-line 6-cylinder engine. It has a longer and wider footprint compared to the OM402A engine. The cylinders of the OM402B engine are arranged in a single line. The OM402B engine is used in applications that require higher torque and power output, such as in heavy-duty trucks and industrial machinery. The inline 6-cylinder configuration of the OM402B engine provides smoother operation and higher torque output. The OM402B engine is also considered to be more flexible, as it can be tuned or modified to meet certain specifications or requirements.

• OM402LA

  The OM402LA is a turbocharged V6 engine. The turbocharger forces more air into the combustion chamber, which allows for more fuel to be burned and, in turn, generates more power and torque. The turbocharged engine is suitable for applications that require high performance and efficiency. The OM402LA engine is commonly used in modern trucks and buses that need higher power output and better fuel efficiency.

Specification and Maintenance of Om402 Engines

Specification

Below is a look at the specifications of the OM402 engine.

• 1. Engine Code

  OM402 is the engine code that shows the engine was made by Mercedes Benz. The code suggests the series and the type of the engine.

• 2. Configuration

  The engine is a V6 engine. This means it has 6 cylinders arranged in two rows in a V-shape.

• 3. Displacement

  The engine has a displacement of 3.0 liters. This means the total volume of all the cylinders in the engine is 3.0 liters. The large displacement gives the engine more power and torque.

• 4. Bore and Stroke

  Bore: The diameter of the cylinders is 87 mm. This means there is more room in the cylinders for air and fuel, which leads to more power.

  Stroke: The distance the pistons move up and down in the cylinders is 82 mm.

• 5. Compression Ratio

  The compression ratio is 21:1. This means the air and fuel in the cylinders are compressed to 1/21 of the size before ignition. The high compression ratio leads to high power output.

• 6. Power Output

  The power output of the engine is 110 kW. This is equal to 150 hp. The power output is higher because of the large displacement and high compression ratio.

• 7. Torque

  The torque of the engine is 270 Nm. The torque is higher because the engine is designed for high-torque applications, such as pulling heavy loads.

• 8. Fuel System

  The engine uses a direct fuel injection system. In this system, fuel is injected directly into the cylinders under high pressure. This leads to better fuel combustion and more power.

• 9. Valvetrain

  Each cylinder has two valves: one inlet valve and one outlet valve. The inlet valve allows air and fuel into the cylinder, while the outlet valve lets out exhaust gases.

• 10. Cooling System

  The engine uses a liquid cooling system. In this system, liquid circulates around the engine to absorb heat and transfer it to the radiator, where the heat is released.

• 11. Lubrication System

  The engine uses a pressurized lubrication system. In this system, oil is pumped from a sump to all the engine parts that need lubrication.

Maintenance

Below is the maintenance routine for the OM402 engine.

• 1. Engine Oil and Filter

  The engine oil and filter should be changed every 6,000 miles or six months, whichever comes first. This keeps the oil clean and helps it to flow easily. The engine oil also lubricates the moving parts and keeps out dirt and debris.

• 2. Air Filter

  The air filter should be checked every 6,000 miles and replaced if worn out. A clean air filter ensures a clean supply of air into the cylinders for combustion.

• 3. Fuel Filter

  The fuel filter should be changed every 12,000 miles. This ensures the fuel supply to the engine is clean.

• 4. Coolant

  The coolant level should be checked every month. The coolant level should be between the minimum and maximum marks. The coolant should be changed every two years or 50,000 miles, whichever comes first.

• 5. Timing Belt

  The timing belt should be inspected every 40,000 miles and replaced if worn out. The timing belt ensures the engine valves and pistons move in sync.

• 6. Glow Plugs

  The glow plugs should be inspected every 40,000 miles and replaced if faulty. The glow plugs heat the air in the cylinders to make ignition easy.

• 7. Valve Clearance

  The valve clearance should be checked every 40,000 miles and adjusted to the right specification if necessary.

• 8. Exhaust System

  The exhaust system should be checked for leaks or damage every 12,000 miles. The exhaust system carries exhaust gases from the engine to the rear of the vehicle.

• 9. Drive Belts

  The drive belts should be inspected every 12,000 miles and adjusted if loose. The drive belts power the accessories in the engine, such as the alternator and water pump.

• 10. Fuel Injection System

  The fuel injection system should be cleaned every 30,000 miles to prevent the build-up of deposits and ensure smooth operation.

• 11. Emissions Control System

  The emissions control system should be checked every 30,000 miles to ensure it is working well and meets emissions standards.

• 12. Steering and Suspension

  The steering and suspension systems should be checked every 12,000 miles for damage or wear.

• 13. Brake System

  The brake system should be inspected every 12,000 miles. The brake pads, brake discs, and brake linings should be checked for wear and replaced if necessary.

How to choose OM402 engines

There are several factors to consider when choosing an OM402 engine, and they include the following:

• Business needs: The first thing to consider is the business's operation needs. For example, if the business is into logistics, the trucks used for transportation should have powerful engines. In this case, an OM402 engine with a higher horsepower rating should be considered. On the other hand, if the business is into less road transportation, an OM402 engine with less horsepower can be a good choice.
• Fuel efficiency: Fuel efficiency is another important factor to consider when choosing an OM402 engine. This is because, with a more efficient engine, there will be less spending on fuel. The engine's fuel efficiency is determined by the engine's design and the engine's horsepower. Generally, OM402 engines with lower horsepower are more fuel efficient.
• Maintenance requirements: All engines have their unique maintenance requirements. Before choosing an OM402 engine, ensure to check the engine maintenance requirements and see if it is something that can be afforded.
• Noise level: The OM402 engine noise level varies depending on the engine model. Some engines are noisier than others. If engine noise is a concern, look for engines specifically designed to run quietly.
• Environmental impact: Another important factor to consider when choosing an OM402 engine is the environmental impact. The environmental impact of an engine is determined by the emissions it produces. For example, the OM402 engine with higher emissions should be avoided, while the quieter engines with lower emissions are a better choice.

How to DIY and Replace

Replacing the OM402 engine is not an easy task and requires a good understanding of mechanics. Here are the steps:

• Tools Required: Before working on an OM402 engine, it’s important to have the right tools. These could include; wrenches, screwdrivers, pliers, an oil filter wrench, a jack and jack stands, a torque wrench, a socket set, an allen key set, an adjustable spanner, a timing tool set, a piston ring compressor, a digital multimeter, and a vacuum gauge. One may also need an OM642 engine code repair manual for reference. Having the right tools makes the work easier and safer.
• Remove the Old Engine: To do this, the engine's electrical connections should be disconnected, followed by the fuel and cooling systems. The engine should then be unbolted from the transmission and mounted on the engine jack. It should then be lifted and removed from the engine bay with the help of the jack.
• Prepare the New Engine: The new engine's electrical, fuel, and cooling connections should be set up. The engine should then be mounted onto the transmission using the appropriate bolts. Once that is done, the engine should be aligned using a jack and secured with bolts. All electrical connections should be connected to ensure the engine runs smoothly.
• Set the Timing: Timing is crucial for the OM402 engine. Timing should be set using a timing tool set. The timing should be checked and adjusted if necessary, following the specifications in the repair manual.
• Final Checks: Before starting the engine, all bolts and nuts should be tightened to the specified torque. All fluids, including oil and coolant, should be filled to the required levels. The fuel system should be bled to remove any air, and all electrical connections should be double-checked to ensure they are secure.
• Start the Engine: The instructions in the repair manual should be followed to start the engine. If it doesn't start, the troubleshooting steps in the manual should be followed to identify and fix the problem.

Q&A

Q1: What is the OM402 engine?

A1: The OM402 engine, also known as the ""Mercedes-Benz OM402"" or ""Mercedes-Benz 402"", is a type of engine used by the Mercedes-Benz company. The OM402 engine is a 6-cylinder in-line engine with a displacement of 12.0 liters (732 cubic inches). The OM402 engine is a very powerful and efficient engine. The OM402 engine is used in many heavy-duty trucks and buses.

Q2: What are the features of the OM402 engine?

A2: The OM402 engine has many features, such as: 6-cylinder in-line configuration, 12.0-liter (732 cubic-inch) displacement, turbocharged and intercooled, common rail direct fuel injection, dual overhead camshafts, and variable valve timing.

Q3: What are the benefits of the OM402 engine?

A3: The OM402 engine is known for its power and performance. This engine is suitable for heavy-duty applications, such as driving trucks and buses. The OM402 engine also has many environmental benefits. The OM402 engine meets many environmental regulations and standards. The OM402 engine also has many advantages, such as being economical.

Q4: What is the application of the OM402 engine?

A4: The OM402 engine is mainly used in heavy-duty trucks and buses. It can also be used in other industrial equipment, such as construction machinery and agricultural machinery.