A new no-wear two-winding actuator is installed in the M60 engine as the idle actuator. The rotary slide valve in the idle actuator should only be tested by activation in conjunction with a tester or by shaking. The rotary slide valve must not be moved with the finger or with the aid of a tool such as a screwdriver for instance. Perfect operation could then no longer be guarantied.
The idle actuator performs several tasks and is therefore an important component part in the intake air circuit of the engine.
Small quantities of leakage air which occur, for instance, at leaking gaiters/bottles or varying gap of the throttle can be compensated by means of the idle actuator.
During the engine thrust phase, the actuator opens completely and then closes shortly before reaching the idle speed. This prevents a high intake pipe vacuum and blue smoke (oil vapour intake via valve stem seals).
During engine start, the idle actuator releases an opening cross section which is above the idle speed. This improves the engine starting characteristics.
The idle actuator features an emergency operation opening gap which ensures certain emergency operation characteristics in the event of power failure.
On vehicles equipped with ASC or ASC + T, the engine drag torque is controlled by the idle actuator (MSR function). The idle actuator opens if there is a risk that the drive wheels can come to a standstill. As a result the engine speed is increased and the engine drag torque reduced.