Pic. 4.1. Engine compartment of 4-cylinder CDI series diesel engine: 1 - expansion tank of the cooling system; 2 - air intake of the intake system with an air filter; 3 - air intake channel of turbocharging; 4 - cooled plastic box for electronic control devices and relay blocks; 5 - oil filler cap; 6 - air intake grille for interior ventilation; 7 - engine casing; 8 – a casing of an inlet collector; 9 - brake fluid reservoir with master cylinder and brake booster; 10 - oil dipstick; 11 - signal; 12 - radiator; 13 – water cooling hose; 14 - throttle body with gas outlet valve; 15 - windshield washer reservoir; 16 - brake system control module; 17 - reservoir for servo oil; 18 - relay and fuse block
Pic. 4.2. Four-cylinder prechamber diesel engine: 1 - air intake; 2 – a cover of a head of cylinders; 3 - casing of the control valve; 4 – gas exhaust control valve; 5 - low pressure control valve; 6 - exhaust manifold; 7 - branch pipe of the cooling system; 8 - generator; 9 - crankcase; 10 – a belt of a drive of auxiliary units; 11 - fan; 12 – drive of hydraulic pump of servo control; 13 - fuel filter; 14 - oil filter; 15 - oil dipstick; 16 - oil filler neck
A new generation of Mercedes diesel engines began to be installed on the E-Class in 1993. (pic. 4.1). All engines, even the smallest - OM 604 (2.2 l), were equipped with 4-valve pre-chamber cylinder heads, which were first mass-produced for Mercedes diesel engines. The valve drive was carried out from two overhead camshafts (pic. 4.2). The exhaust camshaft was driven by a chain from the crankshaft and in turn drove the intake valve shaft through a gear. High torque was provided by the suction system with long sector intake pipes.
Since June 1998, diesel engines with the Common Rail system have been installed on the Mercedes E-class. The first of this series was the E 200 CDI engine with 85 kW/115 hp. The increase in power was created through the use of a new turbocharger with adjustable guide vanes.