Mercedes-Benz OM602 2.5L Diesel Engine with Gearbox

Description

For sale is a used Mercedes-Benz OM602 2.5L diesel engine with matching gearbox, originally fitted to the Mercedes-Benz 250D. This engine and transmission set was removed from a donor vehicle and inspected prior to listing. Both units remain in good used condition, showing only normal wear consistent with proper maintenance and age. The engine is supplied as a complete long block, and the gearbox is included for a full drivetrain replacement solution. This set is ideal for replacing a worn or damaged powertrain or for use in a classic diesel restoration project.
The OM602 engine is well known for its smooth operation, strong low-end torque, and excellent fuel efficiency. It delivers dependable performance while maintaining Mercedes-Benz’s reputation for long-lasting diesel engines. When paired with its correct gearbox, it provides factory driving characteristics and reliable daily usability.

Performance & Reliability

The OM602 features a single overhead camshaft, 10-valve cylinder head, cast-iron block, and mechanical diesel injection system, designed for efficiency and durability. Prior to removal, the engine operated normally with no abnormal knocking or excessive smoke. During inspection, the following checks were completed:
Engine rotates freely
Compression remains even across cylinders
No visible cracks in block or cylinder head
Oil galleries and mounting points intact
Gearbox shifts through all gears
The OM602 is widely respected for its ability to reach high mileage when properly serviced. Its mechanical fuel system allows for simpler maintenance compared to later electronic diesel engines. The gearbox integrates directly with the engine and factory drivetrain, ensuring smooth power delivery and long-term reliability when installed correctly.
This engine and gearbox set is suitable for stock restorations, daily driver replacements, and classic Mercedes diesel rebuild projects. It also provides a strong foundation for preventative maintenance or light overhaul work.

Fitment

Fits in:
Mercedes-Benz 250D
Mercedes-Benz W124 and W201 models originally equipped with the OM602 engine
This is a direct-fit engine and gearbox set for the above applications when installed with correct accessories, wiring, and mounts. No modification is required when replacing an original OM602 drivetrain. Buyers should confirm engine code and gearbox type before purchase.

Warranty & Installation

This engine and gearbox set includes a 6-month limited mechanical warranty, covering internal engine and transmission components under normal operating conditions. External accessories, sensors, clutch components, seals, and wear items such as belts, hoses, and gaskets are not covered due to prior use.
Professional installation is strongly recommended. During installation, it is advised to:
Replace engine oil, gearbox oil, and filters
Inspect timing components and seals
Check fuel and cooling system connections
Perform initial test run before full operation
Proper installation and service help ensure reliable performance and extended drivetrain life.

If you are looking for a genuine Mercedes-Benz OM602 2.5L diesel engine with gearbox for your 250D, this used set offers dependable operation, correct fitment, and excellent value for classic diesel Mercedes ownership. It is an ideal replacement for a tired or damaged drivetrain while preserving factory specifications and driving characteristics. With proven engineering and solid condition, this engine and gearbox set is ready to return your vehicle to smooth and economical service.