Intake manifold switchover, function - GF07.61-P-3028V

ENGINE 272.920 in MODEL 203

ENGINE 272.922 in MODEL 211

ENGINE 272.940 in MODEL 203, 209

ENGINE 272.941 in MODEL 203

ENGINE 272.942 in MODEL 171

ENGINE 272.943 in MODEL 211

ENGINE 272.944 in MODEL 211

ENGINE 272.945 in MODEL 251

ENGINE 272.946 in MODEL 221

ENGINE 272.960 in MODEL 203, 209

ENGINE 272.963 in MODEL 171

ENGINE 272.964 in MODEL 211, 219

ENGINE 272.965 in MODEL 221

ENGINE 272.966 in MODEL 230

ENGINE 272.967 in MODEL 164, 251

ENGINE 272.970 in MODEL 203

ENGINE 272.972 in MODEL 211

ENGINE 272.975 in MODEL 221

ENGINE 273.922 in MODEL 221

ENGINE 273.923 in MODEL 164

ENGINE 273.924 in MODEL 221

ENGINE 273.943 in MODEL 164

ENGINE 273.960 in MODEL 211, 219

ENGINE 273.961 in MODEL 216, 221

ENGINE 273.962 in MODEL 211

ENGINE 273.963 in MODEL 164, 251

ENGINE 273.965 in MODEL 230

ENGINE 273.967 in MODEL 209

ENGINE 273.968 in MODEL 221

Shown on ENGINE 272

Fig 1: Intake Manifold Switchover, Function (Shown On Engine 272)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

With the intake manifold switchover, switching between a long or a short intake route is possible. For this purpose, a longitudinal switch flap is located in the intake manifold for each cylinder. The longitudinal switch flaps for each cylinder bank are actuated by an aneroid capsule and a flap shaft. Both aneroid capsules are connected by a vacuum line.

The variable intake manifold switchover valve is connected in series in the vacuum line to the aneroid capsules.

Short intake route (without actuation)

The variable intake manifold switchover valve is de-energized and the aneroid capsules are ventilated. Without actuation, the length switch flaps by spring force and free up the short intake route.

Long intake route

If the variable intake manifold switchover valve is actuated by a ground signal from the ME control unit, vacuum pressure from the vacuum memory enters the aneroid capsules. The flap shafts are operated and the length switch flaps close.

Under the following conditions, the long intake route is selected:

Engine load more than approx. 50%.
Engine speed lower than 3500 RPM

Only an intake manifold switchover aneroid capsule is installed for engine 273. The two flap shafts are combined in the intake manifold.

	Component description for the ME-SFI [ME] control unit		GF07.61-P-6000V
	Component description for the variable intake manifold switchover valve		GF09.20-P-6001V
	Component description for the intake manifold		GF09.20-P-6010V
	Component description for the crankshaft Hall sensor		GF07.04-P-6220V
	Component description for the hot film MAF sensor		GF07.07-P-6000V
	Component description for the throttle valve actuator		GF30.20-P-2020V