Metering Oil Pump Construction/Operation; Construction - Mazda RX-8 2004 Service Highlights

• An oil pressure regulator has been adopted on
the rear side housing to release oil when the oil
pressure is 538—638 kPa {5.5—6.5 kgf/cm
78.0—92.5 psi} or more.
End Of Sie

METERING OIL PUMP CONSTRUCTION/OPERATION

Construction

• An electric metering oil pump has been adopted to reduce oil consumption by controlling the amount of oil
discharged.
• The electric metering oil pump is controlled by the PCM.
• The PCM sends a pulse signal controlling the amount of oil discharged to the metering oil pump according to
the engine rotation, engine coolant temperature, and the amount of intake air.
METERING OIL PUMP
OIL OUTLET
SECTIONAL VIEW
POSITIONING
SWITCH
CONTROL PIN
PLUNGER
DRIVING WORM
LUBRICATION
2
,
ENGINE ATTACHMENT
SIDE
OIL INLET
STEPPING MOTOR
DIFFERENTIAL
PLUNGER
PLUNGER
SUB-PLUNGER
SUB-PLUNGER
OIL
INLET
DIFFERENTIAL PLUNGER
BELOW
SPECIFIED
VALUE
ABOVE
SPECIFIED
VALUE
PCM
2Y 2V 2AB 2W
PCM
POSITIONING SWITCH
1U 2N
UNUSED
TERMINAL
CHU0111S015
CHU011101008S07
STEPPING MOTOR
C
D
COIL NO.1
E
COIL NO.2
F
COIL NO.3
A
COIL NO.4
B
A
C
CHU0111S013
01–11–5
01–11