Pic. 4.3. Engine compartment with 270 CDI diesel engine: 1 - electronic block; 2 - grille of the air intake for ventilation of the passenger compartment; 3 – control valve body; 4 – a cover of nozzles and candles of heating; 5 – cleaner lever drive; 6 - oil filter; 7 - intake manifold; 8 – brake fluid reservoir with master cylinder and booster; 9 - block of fuses and relays; 10 - expansion tank of the cooling system; 11 - air intake with air filter; 12 – gas exhaust control valve; 13 - oil dipstick; 14 - oil filler neck; 15 - fuel filter; 16 - brake system control module; 17 - washer tank (front - for headlights, rear - for windshield wiper); 18 - reservoir for servo oil
Pic. 4.4. Diesel engine 290 TD (OM 602): 1 - air intake of the intake system; 2 – a cover of a head of cylinders; 3 – housing of control valves with a low pressure control valve; 4 - gas outlet valve; 5 - gearbox; 6 - turbine; 7 - branch pipes of the cooling system; 8 - channel for supplying charge air from the compressor to the radiator; 9 - generator; 10 - fan; 11 - turbocharger radiator; 12 – conditioner drive; 13 - channel for supplying charge air from the radiator to the intake manifold; 14 – servo control oil pump drive; 15 - reservoir for servo oil; 16 - intake manifold
Engine 290TD (OM 602) is the first direct injection diesel on a Mercedes-Benz passenger car (pic. 4.3). It is equipped with two valves per cylinder. The combustion chamber is equipped with a nozzle that supplies fuel under high pressure (up to 310 bar), which ignites directly in the combustion chamber under the influence of hot compressed air. According to its characteristics, the 5-cylinder engine corresponds to the 4-cylinder OM 604. The crankshaft of the 5-cylinder engine is mounted on six (instead of five) thrust bearings (pic. 4.4). Since 1999, the production of the 270 CDI inline 5-cylinder common rail engine began, replacing the previous 290 TD model.