Lexus RX300 (MCU15). Manual — part 40

EG

ENGINE — 1MZ-FE ENGINE

33

JLUBRICATION SYSTEM

1. General

D The lubrication is fully pressurized and all oil passes through an oil filer.

D A trochoid gear type oil pump is directly driven by the crankshaft.

187EG21

BYPASS
VALVE

RELIEF
VALVE

MAIN OIL HOLE

CYLINDER HEAD
(FOR LEFT BANK)

OIL FILTER

OIL PUMP

OIL STRAINER

OIL PAN

CRANKSHAFT

JOURNAL

PISTONS

SCISSORS GEAR

MECHANISM

SCISSORS GEAR

MECHANISM

EXHAUST
CAMSHAFT
JOURNALS

INTAKE
CAMSHAFT
JOURNALS

CAMSHAFT
TIMING OIL
CONTROL FILTER

CAMSHAFT
TIMING OIL
CONTROL VALVE

VVT-i

VVT-i

OIL JETS

CAMSHAFT
TIMING OIL
CONTROL FILTER

CAMSHAFT
TIMING OIL
CONTROL VALVE

CRANKSHAFT

PINS

CYLINDER HEAD
(FOR RIGHT BANK)

INTAKE
CAMSHAFT
JOURNALS

187EG22

EXHAUST
TIMING
JOURNALS

ENGINE — 1MZ-FE ENGINE

34

2. Oil Pan

D The oil pan is made up of 2 pieces. No. 1 oil pan is made of aluminum alloy and No. 2 oil pan is made

of steel sheet.

D No. 1 oil pan is secured to the cylinder block and the transaxle housing and is increasing rigidity.

Baffle Plate

Oil Strainer

No. 1 Oil Pan

No. 2 Oil Pan

187EG23

EG

ENGINE — 1MZ-FE ENGINE

35

JCOOLING SYSTEM

D The cooling system is a pressurized, forced - circulation type.

D A thermostat having a bypass valve is located on the water pump inlet side of the cooling circuit.

To Heater

From Heater

To Radiator

From Radiator

Heater

Heater Valve

Throttle Body

Thermostat

Bypass Passage

Radiator

Intake Manifold

Water
Pump

187EG25

187EG24

ENGINE — 1MZ-FE ENGINE

Intake Air Control Valve

Throttle Valves

161ES58

Actuator (for ACIS)

36

JINTAKE AND EXHAUST SYSTEM

1. Throttle Body

To accommodate the 3-stage ACIS (Acoustic Con-
trol Induction System), a throttle body that provides
2 barrels throttle valve has been adopted. The intake
air control valve for the 3-stage ACIS is integrated
in the throttle body.
For details, see page 54 (ACIS Section).

2. Intake Air Chamber

The intake air chamber consists of upper and lower sections and contains an intake air control valve. This
valve is activated by ACIS and is used to alter the intake pipe length to improve the engine performance
in all speed ranges.

Intake Air Control Valve

Actuator
(for ACIS)

187EG26