Exhaust Valve Control For An Activated Engine Brake; Valve Control On The Inlet Side - Mercedes-Benz OM 471 Introduction Into Service Manual

Exhaust valve control for an activated engine brake

2 Exhaust rocker arm with hydroelement
3 Brake rocker arm
4 Exhaust rocker arm spindle
6 Exhaust camshaft
7 Outlet valve
21 Piston
22 Check valve
When in engine brake operation up to six exhaust valves (7), one per cylinder are opened as
follows, according to the engine brake stage, by the brake cam of the exhaust camshaft (6):
The corresponding exhaust rocker arms with hydroelement (2) have oil pressure applied to
them in engine brake operation via the oil inlet hole (20). If the corresponding brake rocker
arm (3) now presses on the piston (21), the check valve (22) is closed by the increased oil
pressure. Depressurization is prevented and the downward movement of the respective
brake rocker arm (3) is transmitted by the piston (21) onto the associated exhaust rocker arm
with hydroelement (2) which opens the respective exhaust valve (7).

Valve control on the inlet side

8 Valve springs
9 Intake rocker arm
10 Intake rocker arm spindle
12 Intake camshaft
13 Inlet valves
19 Adjusting elements for adjusting the valve clearance
i Introduction of engine OM 471 and exhaust aftertreatment > 09/2011 >
– This printout will not be recorded by the update service. Status: 09 / 2011 –
As>built configurations
W05.00>1025>73
W05.00>1039>82
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