Engine Brake Deactivated - Mercedes-Benz OM 471 Introduction Into Service Manual

Engine brake solenoid valve, shown on engine brake solenoid
valve, stage 1
10 Exhaust rocker shaft
14 Cylinder 1...3 oil duct
19 Coil
20 Valve body
Y624 Engine brake solenoid valve, stage 1

Engine brake deactivated

1 Exhaust rocker arm
2 Exhaust rocker arm with
hydroelement
3 Brake rocker arm
4 Exhaust cams
5 Exhaust cams
In normal driving mode, if the engine brake is not activated, the
engine brake solenoid valve, stage 1 (Y624) and the engine brake
solenoid valve, stage 2 (Y625) are not actuated.
In this way no oil pressure can find its way out of the engine oil
circuit over the oil ducts for the exhaust rocker shaft (10) to the
exhaust rocker arms with hydroelement (2). The oil pressure
present causes the piston (8) contained therein to be pressed by
the spring (9) onto its downstop.
i Introduction of engine OM 471 and exhaust aftertreatment > 09/2011 >
6 Brake cam
7 Outlet valve
8 Piston
9 Spring
14 Cylinder 1...3 oil duct
– This printout will not be recorded by the update service. Status: 09 / 2011 –
15 Cylinder 4...6 oil duct
16 Check valve
Y624 Engine brake solenoid valve, stage 1
Y625 Engine brake solenoid valve, stage 2
The respective brake rocker arm (3) does shift on the respective
brake cams (6) but comes to nothing due to the missing frictional
connection to piston (8).
Both exhaust valves (7) are therefore opened or closed as normal
according to the cycles of the working cycle.
Functions
W14.15>1140>81
W14.15>1133>79
61