Lexus ES300 (2002 year). Service manual — part 127
ENGINE – 1MZ-FE ENGINE
EG-7
208EG63
60
Water pump Swirl Chamber
Knock Sensor Bosses
36.6 mm
105.5 mm
Crankshaft Bearing Cap
Sela Washer
Plastic Region Tightening Bolts
View of Top Side
198EG38
187EG10
4. Cylinder Block
The cylinder block has a bank angle of 60, a bank offset of 36.6 mm (1.44 in.) and a bore pitch of 105.5
mm (4.15 in.), resulting in a compact block.
Lightweight aluminum alloy is used for the cylinder block.
A thin cast-iron liner is press- fit inside the cylinder to ensure an added reliability. This liner is thin, so that
boring is not possible.
A water pump swirl chamber and an inlet passage to the pump are provided in the V-bank to help make
the engine compact.
Knock sensor bosses are provided at 2 locations in V-bank.
The crankshaft bearing caps are tightened using 4 plastic- region bolts for each journal. In addition, each
cap is tightened laterally to improve its reliability.
ENGINE – 1MZ-FE ENGINE
EG-8
208EG105
Resin Coating
for Right Bank
208EG106
Knock Pin
Plastic Region
Tightening Bolt
5. Piston
The piston is made of aluminum alloy and skirt area is made compact and lightweight.
The piston skirt has been coated with resin to reduce the friction loss.
Full floating type piston pins are used.
Each of the pistons is made specifically for the right or left bank.
6. Connecting Rod
Connecting rods that have been forged for high
strength are used for weight reduction.
An aluminum bearing with overlay is used for
the connecting rod bearings.
Plastic region tightening bolts are used.
Knock pins are used at the mating surfaces of
the bearing caps of the connecting rod to mini-
mize the shifting of the bearing caps during as-
sembly.
ENGINE – 1MZ-FE ENGINE
EG-9
208EG72
Engine
Front
Roll-Finished
No.1 Journal
Balance Weight
No.4 Journal
187EG14
Engine
Front
Cast Iron
Steel
Aluminum
Torsional
Damper Rubber
7. Crankshaft
The crankshaft is made of forged steel and has 4 journals and 9 balance weights.
All pin and journal fillets are roll-finished to maintain adequate strength.
The crankshaft bearings for the No.1 and No.4 journals are made wider to decrease noise and vibration,
and those for the No.2 and No.3 journals are made narrower friction.
8. Crankshaft Pulley
The crankshaft pulley hub is made of aluminum
to reduce weight and vibration.
The rigidity of the torsional damper rubber has
been optimized to reduce noise.
ENGINE – 1MZ-FE ENGINE
EG-16
208EG119
Water Pump
Water Outlet
Bypass Passage
Intake Manifold
To Heater
Front Heater
From Radiator
To Radiator
Thermostat
Heater
Heater Valve
Throttle Body
Thermostat
Cylinder Block
Bypass Passage
Radiator
Water
Pump
187EG25
COOLING SYSTEM
The cooling system is a pressurized, forced-circulation type.
A thermostat having a bypass valve is located on the water pump inlet side of the cooling circuit.
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