Fig. 4.3. Engine compartment with 270 CDI diesel engine: 1 – electronic unit; 2 – air intake grille for interior ventilation; 3 – control valve body; 4 – cover of injectors and glow plugs; 5 – wiper lever drive; 6 – oil filter; 7 – intake manifold; 8 – brake fluid reservoir with master cylinder and booster; 9 – fuse and relay box; 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 reservoir (front – for headlights, rear – for windshield wiper); 18 – reservoir for servo oil
Fig. 4.4. Diesel engine 290 TD (OM 602): 1 – air intake of the intake system; 2 – cylinder head cover; 3 – control valve body with low pressure control valve; 4 – gas outlet valve; 5 – gearbox; 6 – turbine; 7 – cooling system pipes; 8 – channel for supplying supercharged air from the compressor to the radiator; 9 – generator; 10 – fan; 11 – turbocharger radiator; 12 – air conditioner drive; 13 – channel for supplying supercharged air from the radiator to the intake manifold; 14 – servo control oil pump drive; 15 – reservoir for servo oil; 16 – intake manifold
The 290 TD (OM 602) engine is the first direct injection diesel engine in Mercedes-Benz passenger cars (Fig. 4.3). It has two valves per cylinder. The combustion chamber contains an injector that supplies fuel under high pressure (up to 310 bar), which ignites directly in the combustion chamber under the influence of hot compressed air. In terms of 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) support bearings (Fig. 4.4). Since 1999, the production of the in-line 5-cylinder 270 CDI engine with a Common Rail system began, replacing the previous 290 TD model.
(Information copied from the website: «mercedesman.ru»)