GF09.40-P-4010MOR Component Description For Turbocharger

GF09.40-P-4010MOR Component Description For Turbocharger
- ENGINE 275.9 in MODEL 230.4 as of model year 2009 / AEJ 08 model refinement package





View of engine from right and left
110/1 Intake duct (to turbocharger)
110/4 Deceleration air valve
110/6 Charge air pipe
110 A Left turbocharger
110b Right turbocharger
B Exhaust
D Suction line downstream of air filter (for combustion engine 275.983 with code (P99) Special model "AMG Black Series" other process)
E Charge air

Location
One turbocharger is installed for each cylinder bank (Biturbo).

Task
The turbocharger compress the intake air, thus raising the filling efficiency of the cylinder and increasing the engine torque.

Design
Sectional view of LH turbocharger





14 Exhaust manifold
110/3 Vacuum cell
110/4 Deceleration air valve
110 C Turbine wheel
110 D Compressor impeller
110e Shaft 110f Shaft housing
110/3a Boost pressure control flap
B Exhaust
D Intake air (downstream of air filter)
E Charge air





View of turbocharger from bottom right
14 Exhaust manifold
110/3 Vacuum cell
110/3a Charge pressure control valve
110/3b Control rod
110/4 Deceleration air valve
110b Right turbocharger

The turbocharger is made of cast steel. The turbine housings are integrated in the exhaust manifold.
The shaft housings are cooled by the coolant circuit and the shafts are lubricated by the engine oil circuit.

Function
With forced induction, the flow energy of the exhaust gases is used to drive the turbocharger.

The turbochargers draw fresh air through the air filters into the compressor inlets, from where it passes through the compressor outlets to the charge air pipes upstream of the charge air coolers.
Due to the high rotational speed of the compressor impellers and the resulting high volume flow rate, the intake air becomes compressed in the charge air pipes.
The maximum boost pressure for combustion engine 275.954 is about 0.9 bar, for combustion engine 275.981 (AMG) about 1.5 bar and for combustion engine 275.983 with code (P99) Special model "AMG Black Series" about 2.4 bar.

To control the boost pressure, the exhaust flows that drive the turbine wheels are redirected through bypasses (wastegates) by opening the boost pressure control flaps. Through a linkage, the vacuum cells also open the boost pressure control flaps, which close off the bypasses.

The deceleration air valves prevent pressure peaks in the turbochargers (brief howling) during the transition from load to deceleration mode.
To do this, the deceleration air valves open which bypasses the compressor impellers whereby the boost pressure is reduced.

The compressor impeller at the left turbocharger can be slightly smeared with oil from the crankcase ventilation system.