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Turbocharger, function - GF09.40-P-3100-01M

ENGINE 275.950 in MODEL 215, 220 ENGINE 275.951 in MODEL 230 ENGINE 275.953 in MODEL 216, 221 ENGINE 275.954 in MODEL 230 ENGINE 275.980 in MODEL 215, 220 ENGINE 275.981 in MODEL 230 ENGINE 275.982 in MODEL 216, 221 ENGINE 285.950 i 

Cut-away model left turbocharger 

Fig 1: Cut-Away Model Of Left Turbocharger
G07630300Courtesy of MERCEDES-BENZ USA
Fig 2: Identifying Turbocharger Components
G07630301Courtesy of MERCEDES-BENZ USA

Function 

The exhaust gases of each cylinder bank are directed through the exhaust manifold into the turbine housing onto the turbine wheel (110c). The flow energy of the exhaust gases (B) set the turbine wheel in rotation.

As a result, the compressor turbine wheel (110d), which is connected to the turbine wheel by the shaft (110e), is also driven at the same speed. The clean air suctioned by the compressor turbine wheel (D) is compressed (E) and allocated to the engine.

The boost pressure control is performed by opening and closing the boost pressure control valve (110/3a), which releases a bypass around the turbine wheel. The boost pressure control valve (110/3a) is operated via the vacuum cell (110/3) with the control rod (110/3b). The controlled range on the control rod is approx. 8 up to 13 mm.

The vacuum cells (110/3) of both turbochargers are discharged together with the pressure of the boost pressure control pressure transducer (Y31/5).

Each turbocharger has a deceleration air valve, which on transition from load to deceleration operation releases a bypass around the compressor turbine wheel. Through the quick boost pressure removal charger noises are prevented.

The shaft housing of both turbochargers are cooled with coolant and connected to the engine lubrication.

IMPORTANT The compressor turbine wheel at the left turbocharger can be slightly smeared with oil due to the vapors of the crankcase ventilation.

IMPORTANT Observe installation notes for exhaust manifold/turbocharger with assembly tool!

IMPORTANT For troubleshooting when boost pressure is missing, continue as follows:

  1. Check leaktightness of boost pressure pipes (check gaskets and hose clamps between compressor housing and intake manifold)
  2. Check function of boost pressure control with boost pressure control pressure transducer (Y31/5).
  3. Check leaktightness and actuation of deceleration air valves.
  4. Check rotation of both turbochargers (exhaust system removed).
    Fig 3: Checking Turbocharger Rotation
    G07630302Courtesy of MERCEDES-BENZ USA
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