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Toyota 1UZ-FE Engine Specifications
The Toyota 1UZ-FE is a 4.0 L (3,968 cc, 242.1 cubic inches) V8, four-stroke cycle water-cooled naturally aspirated internal combustion gasoline engine, manufactured by the Toyota Motor Corporation since 1989 to 2004. The engine has 8 cylinders in a V-arrangement at a bank angle of 90°. The 1UZ-FE features aluminum cylinder block with a five-bearings crankshaft and two aluminum heads with two camshafts (DOHC) and four valves per cylinder (32 in total). Until 1994 the Toyota 1UZ-FE engine is equipped with Multi-port fuel injection (MFI) system, and after 1994 it used Sequential multi-point fuel injection (SFI). The latest engine versions (after 1997) were equipped with a VVTi (Variable Valve Timing) system for the intake camshafts. Cylinder bore and piston stroke are 87.5 mm (3.44 in) and 82.5 mm (3.25 in), respectively. Compression ratio rating is 10.0:1 (1989-1994), 10.4:1 (1994-1997) and 10.5:1 (after 1997). The Toyota 1UZ-FE engine produced from 259 PS (191 kW; 256 HP) at 5,400 rpm to 300 PS (221 kW; 296 HP) at 6,000 rpm of maximum power and from 333 Nm (34 kgm, 245.4 ft-lb) at 4,000 rpm to 420 Nm (42.8 kgm, 309.5 ft-lb) at 4,600 rpm of peak torque depending on year and vehicle model.
Engine code identification:
1 – 1st generation engine
UZ – Engine family
F – Economy narrow-angle DOHC
E – Multi Point Fuel Injection
| GENERAL TECHNICAL DATA |
Engine model ...................... 1UZ-FE
Cylinder layout ...................... Four stroke, V8
Fuel type ...................... Gasoline (petrol)
Year of production ...................... 1989-2004
Total displacement ...................... 4.0 L, 3,968 cc (242.1 cubic inches)
Fuel system ...................... Before 1994: Multi-port fuel
injection (MFI)
After 1994: Sequential multi-point fuel injection (SFI)
Power adder ...................... None
Maximum power ...................... From 259 PS (191 kW; 256 HP) at
5,400 rpm
to 300 PS (221 kW; 296 HP) at 6,000 rpm
Maximum torque ...................... From 333 Nm (34 kgm, 245.4 ft-lb)
at 4,000 rpm
to 420 Nm (42.8 kgm, 309.5 ft-lb) at 4,600 rpm
Firing order ...................... 1-8-4-3-6-5-7-2
Dimensions (L x W x H) ...................... No data available
Weight ...................... No data available
| CYLINDER BLOCK |
The 1UZ–FE engine has 8-cylinders in a V-arrangement at arrangement at a
bank angle of 90°. The cylinder block made of aluminum alloy. Cast-iron
cylinders are installed inside the cylinder block. This engine’s
ignition order is 1-8-4-3-6-5-7-2. The crankshaft is supported by five
bearings inside the crankcase, these bearings are made of a copper and
lead alloy. The crankshaft is integrated with 8 weights for balance.
Pistons are made of high-temperature resistant aluminum alloy, and
depression is built into the pistons head to prevent interference with
the valves. Piston pins are full-floating. Each piston is fitted with
two compression and single oil ring. The top compression ring is made of
steel and the second ring is made of the cast-iron, the oil ring is made
of a combination of steel and stainless steel.
The cylinder bore is 87.5 mm (3.44 in) and the piston stroke is 82.5 mm
(3.25 in). Compression ratio rating is 10.5:1, 10.4:1 or 10:1.
Cylinder block alloy ...................... Aluminium
Compression ratio ...................... 1989-1994: 10.0:1
1994-1997: 10.4:1
1997-2004: 10.5:1
Cylinder bore ...................... 87.5 mm (3.44 in)
Piston stroke ...................... 82.5 mm (3.25 in)
Number of piston rings (compression / oil) ...................... 2 / 1
Number of main bearings ...................... 5
Cylinder inner diameter (standard) ...................... 87.500-87.510
mm (3.4449-3.4453 in)
Piston skirt diameter (standard) ...................... 87.470-87.480
mm (3.4437-3.4441 in)
Piston compression height ...................... No data available
Piston pin outer diameter ...................... 21.997-22.009 mm
(0.866-0.8665 in)
Connecting rod bushing inner diameter ......................
22.005-22.014 mm (0.8663-0.8667 in)
Piston ring side clearance ...................... Top
...................... 0.020-0.060 mm (0.0008-0.0024 in)
Second ...................... 0.015-0.055 mm (0.0006-0.0022 in)
Piston ring end gap ...................... Top ......................
0.250-0.450 mm (0.0098-0.0177 in)
Second ...................... 0.350-0.600 mm (0.0138-0.0236 in)
Oil ...................... 0.150-0.500 mm (0.0059-0.0197 in)
Crankshaft main journal diameter ...................... 66.988-67.000
mm (2.6373-2.6378 in)
Crankpin diameter ...................... 51.982-52.000 mm
(2.0465-2.0472 in)
Main bearing cap bolts tightening procedure and torque specs:
For nut:
Step 1: 27 Nm; 2.7 kgm; 20 ft-lb
Step 2: Turn bolts 90°
For bolt:
49 Nm; 5.0 kgm; 36 ft-lb
After securing bearing cap bolts, make sure crankshaft turns smoothly by
hand.
Connecting rod bearing bolts
Step 1: 25 Nm; 2.5 kgm; 18 ft-lb
Step 2: Turn bolts 90°
| CYLINDER HEAD |
The cylinder heads are made of aluminum alloy, with a cross-flow type
intake and exhaust layout and with pentroof type combustion chambers.
The spark plugs are located in the center of the combustion chamber. The
1UZ-FE engine has dual overhead camshafts design (DOHC) with four valves
per cylinder (32 valves in total). The intake camshafts are driven by
the timing belt, and a gear on the intake camshaft engages with a gear
on the exhaust camshaft to drive it. Since 1997, the engine began to use
the VVTi (Variable Valve Timing-intelligent) system.
The first generation of the 1UZ-FE engine did not have variable valve
timing and its intake duration was 224° and exhaust duration was 229°.
In 1994, valve timing and valve lift for the intake valves were
modified: valve overlap increased to 9°, intake duration to 232° and
exhaust duration to 229°. From 1997, the 1UZ-FE engine was fitted with
the VVT-i system. As a result, intake valve overlap ranged from -11 to
39°, intake valves duration was 230° and exhaust duration was 229°.
Block head alloy ...................... Aluminium
Valve Arrangement ...................... DOHC, belt drive
Cylinder head height ...................... No data available
Valves ...................... 32 (4 valves per cylinder)
Intake valve timing ...................... Non VVTi (before 1994): 224°
Non VVTi (after 1994): 232°
VVTi (after 1997): 230°
Exhaust valve timing ...................... Non VVTi (before 1994):
229°
Non VVTi (after 1994): 229°
VVTi (after 1997): 229°
Valve head diameter ...................... INTAKE
...................... Before 1997: 33.5 mm (1.3189 in)
After 1997: 34.5 mm (1.3583 in)
EXHAUST ...................... Before 1997: 28.0 mm (1.1024 in)
After 1997: 29.0 mm (1.1417 in)
Valve stem diameter ...................... INTAKE
...................... Before 1997: 5.970-5.985 mm (0.2350-0.2356 in)
After 1997: 5.470-5.485 mm (0.2154-0.2159 in)
EXHAUST ...................... Before 1997: 5.965-5.980 mm
(0.2348-0.2354 in)
After 1997: 5.465-5.480 mm (0.2152-0.2157 in)
Head tightening procedure and torque specs:
Step 1: 39 Nm; 4.0 kgm; 29 ft-lb
Step 2: Turn all bolts 90°
| MAINTENANCE DATA |
Valve clearance (Cold)
Intake valve ...................... 0.15-0.25 mm (0.006-0.010 in)
Exhaust valve ...................... 0.25-0.35 mm (0.010-0.014 in)
Compression pressure
Standard ...................... 12.5 kg/m2 / 300 rpm
Minimun ...................... 10.0 kg/m2 / 300 rpm
Compression differential limit between cylinders ......................
1.0 kg/m2 / 300 rpm
Oil system
Oil consumption , L/1000 km (qt. per miles) ...................... up to
0.5 (1 qt. per 1200 miles)
Recommended engine oil ...................... 5W-30
Oil type API ...................... SH
Engine oil capacity (Refill capacity) ...................... Dru fill:
6.0 L (6.3 US qts, 5.3 Imp.qts)
With filter change 4.8 L (5.1 US qts, 4.2 Imp.qts)
Without filter change 4.5 L (4.8 US qts, 4.0 Imp.qts)
Oil change interval, km (miles) ...................... 10,000 (6,000)
Oil Pressure ...................... Idle speed: 29 kPa (0.3 kgf/cm 2 ,
4.3 psi) or more
3,000 rpm: 294 – 588 kPa (3.0 – 6.0 kgf/cm 2 , 43 – 85 psi)
Ignition system
Spark plug ...................... NGK: BKR6EP-11
DENSO: SK20R11
Spark plug gap ...................... 1.1 mm (0.0433 in)
Spark plug tightening torque ...................... 18 Nm (1.8 kg-m, 13
ft-lb)
| VEHICLE APPLICATIONS |
Model ...................... Years Produced
Toyota Celsior ...................... 1989-2000
Toyota Crown ...................... 1989-2002
Toyota Crown Majesta ...................... 1989-2002
Toyota HiAce HiMedic Ambulance ...................... 1989-2004
Toyota Soarer ...................... 1991-2000
Toyota Aristo ...................... 1992-2000
Lexus LS 400 ...................... 1989-2000
Lexus SC 400 ...................... 1991-2000
Lexus GS 400 ...................... 1992-2000
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| Engines Technical Specifications |