Toyota 2UZ-FE Specifications
| Engine Model: Toyota 2UZ-FE |
| Engine Type: 4-cycle 8-cylinder DOHC 32-valve VVT-i liquid-cooled gasoline |
| Total Displacement: 284.6 cu.in (4.66 L) |
| Rated Engine Power: 230-282 Hp (171-210 kW) at 5400 rpm |
| Fuel System Type: Multi-point fuel injection |
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The 2UZ-FE is distinguished within the UZ family by its
cast iron cylinder block, which provides exceptional rigidity and resistance to
cylinder bore distortion under high load. The engine retains the 90-degree V8
configuration with a belt-driven DOHC valvetrain operating four valves per
cylinder via bucket tappets with shim adjustment. Displacement is achieved
through a bore and stroke of 94.0 mm and 84.0 mm respectively, producing a
slightly oversquare configuration that balances low-end torque with high-rpm
breathing.
The engine utilizes Toyota’s MPFI (Multi-Port Fuel Injection) system and
incorporates ACIS (Acoustic Control Induction System), a variable intake
manifold that adjusts runner length to optimize torque across the rev range. Two
distinct generations exist: pre-2004 non-VVT-i variants producing approximately
230-245 hp and 300-315 lb-ft of torque, and post-2004 VVT-i variants that
increased output to 271-282 hp and 315-325 lb-ft.
The engine is of interference design, making timing belt maintenance critical;
failure of the belt results in piston-to-valve contact and catastrophic damage.
Despite this vulnerability, the 2UZ-FE is regarded as one of the most reliable
V8 engines produced for the light truck segment, with a service life frequently
exceeding 400,000 km (250,000 mi) under proper care.
Engine Type: 90° V8, naturally aspirated, longitudinal mounting.
Displacement: 4,664 cc (284.6 cu.in).
Bore: 94.0 mm (3.70 in).
Stroke: 84.0 mm (3.31 in).
Compression Ratio: 9.6:1 (non-VVT-i variants); 10.0:1 (VVT-i variants).
Engine Management System: Toyota EFI with MPFI.
Ignition System: Electronic, distributorless with coil-on-plug or individual
igniters.
Firing Order: 1-8-4-3-6-5-7-2.
Max Power (non-VVT-i): 171-183 kW (230-245 hp; 233-248 PS) @ 4,800 rpm.
Max Power (VVT-i): 202-210 kW (271-282 hp; 275-286 PS) @ 5,400 rpm.
Max Torque (non-VVT-i): 407-427 Nm (300-315 lb-ft) @ 3,400 rpm.
Max Torque (VVT-i): 427-441 Nm (315-325 lb-ft) @ 3,400 rpm.
Redline: 5,800 rpm (non-VVT-i); 6,000 rpm (VVT-i).
The cylinder block is constructed from high-strength
cast iron, a departure from the aluminum blocks used in other UZ-family engines.
This material selection was driven by the requirement for extreme durability
under sustained towing loads, high ambient temperatures, and off-road operation.
The cast iron construction provides superior rigidity, reducing bore distortion
under high cylinder pressures and maintaining consistent piston ring sealing
over extended service intervals.
The block is of a deep-skirt design, with the cylinder bores extending below the
crankshaft centerline. The 90-degree V8 architecture incorporates a cross-bolted
main bearing system: the five main bearing caps are secured with both vertical
bolts and horizontal cross-bolts that thread into the block sidewalls, providing
exceptional crankshaft support.
The cylinder bores are machined directly into the cast iron without separate
liners, utilizing a plateau-honed finish. The water jacket surrounds the
cylinders fully, with coolant passages designed to provide uniform cooling
across both banks. The block includes provisions for a piston oil squirter
system in VVT-i variants, directing oil jets at the underside of each piston for
improved thermal management.
The cylinder heads are separate castings in aluminum
alloy for the left and right banks, each covering four cylinders. The DOHC
valvetrain utilizes a timing belt to drive the camshafts, with the belt routed
around the crankshaft sprocket, idler pulleys, and water pump. Four valves per
cylinder are arranged in a pent-roof combustion chamber, actuated by bucket
tappets with shim adjustment for valve clearance.
The VVT-i system, introduced in 2004 for Land Cruiser and LX 470 applications
and in 2005 for Tundra and Sequoia, adds variable valve timing on the intake
camshafts. A hydraulically actuated phaser mounted on each intake camshaft
sprocket adjusts camshaft timing continuously across a range of approximately 40
degrees.
Valves: 32 total (16 intake, 16 exhaust).
Intake Valve Diameter: 34.5 mm (1.36 in).
Exhaust Valve Diameter: 30.0 mm (1.18 in).
Valve Stem Diameter: 6.0 mm (0.24 in) for both intake and exhaust.
Valve Seat Material: Sintered alloy steel inserts with induction-hardened seats
for exhaust valves.
The cylinder head gasket is a multi-layer steel (MLS) design, specifically
engineered to accommodate the differential thermal expansion between the cast
iron block and aluminum heads. The intake ports are designed to generate swirl
for improved combustion efficiency, while the exhaust ports are shaped to
promote rapid catalyst light-off.
The fuel system is a returnless multi-point fuel
injection (MPFI) design. Fuel is delivered from an in-tank pump to a fuel rail
on each cylinder bank, with eight injectors positioned in the intake manifold
runners near the intake ports. The system operates at a nominal pressure of 3.5
bar (50.8 psi).
The ECU controls injection timing and duration based on inputs from the mass air
flow sensor, throttle position sensor, engine coolant temperature sensor, and
dual oxygen sensors (one per bank) for closed-loop operation. The ACIS (Acoustic
Control Induction System) utilizes a butterfly valve within the intake manifold
to vary the effective intake runner length: long runners for low-end torque,
short runners for high-rpm power. The system is vacuum-actuated and controlled
by the ECU based on engine speed and load.
The lubrication system is a pressurized, wet-sump
design with a gear-type oil pump driven directly by the crankshaft. The pump is
mounted within the timing cover assembly and draws oil from a stamped steel or
aluminum oil pan through a screened pickup tube. A full-flow, spin-on oil filter
is mounted externally on the engine block.
The system supplies oil to the cross-bolted main bearings, connecting rod
bearings, camshaft bearings, and, on VVT-i variants, the VVT phasers and piston
cooling jets. An oil cooler, integrated with the oil filter housing, uses engine
coolant to maintain oil temperature under sustained high-load conditions.
Oil Capacity (including filter): 6.2-6.8 liters (6.5-7.2 US qt)
Oil Pressure at 3,000 rpm: 300-500 kPa (43.5-72.5 psi)
Recommended Oil Viscosity: 5W-30, API SL/SM or ILSAC GF-4/GF-5
Oil Pump Type: Gear-type, crankshaft-driven
The cooling system is a pressurized, closed-loop design
with a belt-driven water pump mounted to the front of the engine. The water pump
is driven by the timing belt, necessitating replacement during timing belt
service. Coolant flows from the radiator through the pump, into the cylinder
block passages, then upward through the cylinder heads, and returns to the
radiator through a thermostat housing located at the front of the intake
manifold.
A wax-type thermostat maintains an operating temperature between 82-88 °C
(180-190 °F). The system utilizes a cross-flow radiator with an electric cooling
fan, supplemented by a mechanical fan with a viscous clutch on truck
applications. A separate heater circuit draws coolant from the rear of the
cylinder heads. The cooling system capacity is substantial, ranging from 12.5 to
14.5 liters (13.2-15.3 US qt) depending on vehicle application.
Intake System: The intake manifold is a two-piece
aluminum casting incorporating the ACIS variable-length runner system. The
throttle body is electronically controlled on later VVT-i variants, replacing
the mechanical cable-operated throttle. A large-capacity air cleaner housing
with a pleated paper filter element supplies filtered air.
Exhaust System: Cast iron exhaust manifolds on each bank route gases to dual
three-way catalytic converters. Four oxygen sensors are utilized on VVT-i
variants: two upstream sensors for air-fuel ratio control and two downstream
sensors for catalyst efficiency monitoring.
Ignition System: The ignition system is distributorless, with individual
ignition coils mounted directly over each spark plug (coil-on-plug) on later
variants, or a coil-per-cylinder arrangement with short plug wires on early
variants. The ECU controls ignition timing based on engine speed, load, knock
sensor input, and, on VVT-i variants, camshaft position.
Emissions Control: The engine incorporates a positive crankcase ventilation
(PCV) system, an evaporative emissions (EVAP) system with a charcoal canister
and purge valve, and a closed-loop fuel control system to maintain
stoichiometric air-fuel ratio for optimal catalytic converter efficiency.
Overall Length: 715 mm (28.1 in)
Overall Width: 760 mm (29.9 in)
Overall Height: 720 mm (28.3 in)
Dry Weight (complete engine): 220 kg (485 lb) for cast iron block with
accessories
Valve Clearance (Intake): 0.15-0.25 mm (0.006-0.010 in)
when engine is cold. Adjustment by shim replacement. Valve Clearance (Exhaust):
0.25-0.35 mm (0.010-0.014 in) when engine is cold. Adjustment by shim
replacement. Valve Inspection Interval: Every 150,000 km (93,000 mi) or as
indicated by valvetrain noise.
Timing Belt Replacement Interval: 150,000 km (93,000 mi) or 90,000 miles. Water
pump replacement is strongly recommended concurrently due to belt-driven pump
design. Engine Oil Change Interval: 8,000 km (5,000 mi) or 6 months under severe
service; 16,000 km (10,000 mi) under normal conditions with synthetic oil. Oil
Filter Replacement: With every oil change.
Spark Plug Type: SK20R11 (NGK) or equivalent iridium for VVT-i variants; SK16R11
for early non-VVT-i variants. Spark Plug Gap: 1.0-1.1 mm (0.039-0.043 in). Spark
Plug Replacement Interval: 160,000 km (100,000 mi) for iridium plugs. Coolant
Replacement Interval: 80,000 km (50,000 mi) or 4 years. Accessory Drive Belt
Inspection: Every 15,000 km (9,300 mi); replacement interval of 80,000 km
(50,000 mi).
Cylinder Head Bolts (Step 1): 50 Nm (37 lb-ft)
Cylinder Head Bolts (Step 2): 100 Nm (74 lb-ft)
Connecting Rod Cap Bolts: 30 Nm (22 lb-ft)
Main Bearing Cap Bolts (vertical): 50 Nm (37 lb-ft)
Main Bearing Cap Cross-Bolts: 25 Nm (18 lb-ft)
Camshaft Bearing Cap Bolts: 21 Nm (15 lb-ft)
Intake Manifold Bolts: 21 Nm (15 lb-ft)
Exhaust Manifold Nuts: 35 Nm (26 lb-ft)
Spark Plugs: 18 Nm (13 lb-ft)
Oil Filter: 18 Nm (13 lb-ft)
Oil Drain Plug: 35 Nm (26 lb-ft)
Crankshaft Pulley Bolt: 325 Nm (240 lb-ft)
Flywheel/Flexplate Bolts: 75 Nm (55 lb-ft)
The Toyota 2UZ-FE engine served as the primary gasoline
V8 for Toyota’s body-on-frame truck and SUV lineup from 1998 through 2012, with
applications spanning the Toyota and Lexus divisions.
Toyota Land Cruiser (100 Series, J100): The 2UZ-FE was introduced in the 100
Series Land Cruiser for the 1998 model year, replacing the 1FZ-FE inline-six.
Non-VVT-i variants were used from 1998 to 2004; VVT-i variants were introduced
for the 2004 model year and continued through the end of 100 Series production
in 2007.
Toyota Land Cruiser (200 Series, J200): Early 200 Series Land Cruisers produced
from 2007 to 2010 utilized the VVT-i 2UZ-FE before the introduction of the
5.7-liter 3UR-FE in most markets.
Lexus LX 470 (J100): The luxury variant of the Land Cruiser received the 2UZ-FE
from 1998 through 2007, with the VVT-i upgrade applied for the 2004 model year.
Lexus GX 470 (J120): Introduced for the 2003 model year, the GX 470 utilized the
VVT-i 2UZ-FE throughout its production run, which concluded in 2009.
Toyota Tundra (First Generation, XK30/40): The first-generation Tundra,
introduced in 2000, received the 2UZ-FE as its V8 option. Non-VVT-i variants
were used from 2000 to 2004, with VVT-i variants introduced for the 2005 model
year. Production continued through 2006 for the first-generation platform.
Toyota Tundra (Second Generation, XK50): Early second-generation Tundra models
from 2007 to 2009 utilized the 2UZ-FE as the base V8 before being superseded by
the 4.6-liter 1UR-FE.
Toyota Sequoia (First Generation, XK30): The first-generation Sequoia,
introduced for the 2001 model year, employed the 2UZ-FE throughout its
production, which concluded in 2007. The VVT-i variant was introduced for the
2005 model year.
Toyota 4Runner (Fourth Generation, N210): The 4Runner received the 2UZ-FE as the
V8 option for the 2003 model year, continuing through the end of
fourth-generation production in 2009. This application utilized the VVT-i
variant exclusively.
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