MECHANICAL
01–10–19
01–10
Retarding valve timing
• When the spool valve in the oil control valve (OCV) moves to the right according to the PCM signal, hydraulic
pressure, from the oil pump, feeds into the valve timing retard passage and finally to the valve timing retard
chamber in the variable valve timing actuator. Then, the rotor integrated with the camshaft rotates in the valve
timing retard direction, against the housing driven by the crankshaft, and valve timing is retarded.
Maintaining intermediate valve timing
• The spool valve in the oil control valve (OCV) is located near the middle of the valve timing advance and retard
positions. Because of this, hydraulic pressures are maintained in both valve timing advance and retard
chambers of the variable valve timing actuator. At the same time, relative angles of the rotor and the housing
are fixed and maintained, resulting in fixed valve timing.
End Of Sie
ROTOR
TO VALVE TIMING
RETARD CHAMBER
HOUSING
OIL PAN
VALVE TIMING
RETARD CHAMBER
VARIABLE VALVE TIMING ACTUATOR
CAMSHAFT
SPOOL VALVE
OIL PUMP
OIL CONTROL VALVE (OCV)
PCM
FROM VALVE TIMING
ADVANCE CHAMBER
HYDRAULIC PRESSURE FLOW
E5U110ZT5033
OIL PUMP
PCM
TO VALVE TIMING
ADVANCE CHAMBER
TO VALVE TIMING
RETARD CHAMBER
OIL CONTROL VALVE (OCV)
HYDRAULIC PRESSURE FLOW
E5U110ZT5034
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