Section 04 ENGINE (2-STROKE)
Subsection 04 (TOP END)
3
F06D16B
2
1
4
5
RAVE VALVE CLOSED
1. Pulse from crankcase
2. Check valve
3. Positive pressure blocked by the solenoid
4. Solenoid deactivated
5. RAVE valves are opened to atmosphere
947 DI Engines
To open the RAVE valves, the MPEM activates a
solenoid which directs the pressure from air com-
pressor to the valves.
1
F12D02A
1. Pressure from solenoid
1
6
F12D15A
54
23
1. Solenoid
2. Pressure from air compressor
3. Pressure to RAVE valves
4. Vent to air intake silencer
5. Check valve
6. Vent from counterbalancing shaft oil cavity
To close the RAVE valves, the MPEM deactivates
the solenoid which blocks the air compressor
pressure. The RAVE valves are opened to the
atmosphere.
The vent on couterbalancing shaft oil cavity is nec-
essary to prevent pressure buildup in the cavity by
the air compressor piston movement. The check
valve allows pressure to escape from the cavity
but does not allow liquid to enter into the cavity.
smr2004-Complete Line Up 103
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