Air Intake System

AIR INTAKE SYSTEM
Two intake air silencers with air cleaners are located on the right and left side of the engine compartment behind the headlights. Two silencers are used to ensure that the engine complies with international noise emission levels.

Two hot film air mass sensors measure the intake air charge as it is fed into the one central plenum chamber. The plenum chamber is bolted, through an isolating flange, to the eight individual throttle valves.

AIR INTAKE PLENUM
In the intake plenum, each throttle valve has its own air velocity stack which is bolted to the individual throttle housing. The air stacks are 20 cm long and the shape of the stacks is defined by the shape of the plenum. The air intake stacks also help ensure that no objects will fall into the throttle bodies when the plenum cover is removed for service procedures.

The bottom of the plenum chamber contains an oil channel that allows any blow by gasses that condense into liquid to be drained back into the sump. At the forward end of the plenum is a pipe that allows the oil to drain back to the pan.

AIR INTAKE - THROTTLES (DK)

The S62 engine uses eight individual throttle bodies that are bolted directly to the cylinder head All eight throttles are driven via one electric throttle motor (EDR). The EDR motor is mounted in the "V" of the block and controls the throttles through two linkages. The control of the throttle motor is a function of the MS S52 engine control module.

To ensure smooth and stable engine operation all eight throttles must be synchronized for even distribution of the intake air. This is carried out by initially synchronizing the four throttles on each bank with respect to one another. Then by synchronizing the two cylinder banks with respect to one another.

The four throttle shafts of one cylinder head are inter connected by means of a linkage with adjusting screws. The individual throttles are adjusted with these screws.

The procedure for throttle valve adjustment and synchronization is found in the repair information.

ELECTRONIC THROTTLE MOTOR (EDR)

The EDR motor was specifically designed for use with the S62 engine to have enough torque to operate all eight throttle valves and maintain the high degree of safety required of an electronic throttle system.

IDLE SPEED ACTUATOR
A separate idle valve (ZWD 5) is used to supply the idle air to all cylinders. The idle valve is mounted in the "V" of the block and is connected to the throttle valves through pipes mounted between each throttle valve.