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Toyota 3RZ-FE Specifications
| Engine Model: Toyota 3UR-FE |
| Engine Type: 4-cycle inline 4-cylinder 16-valve DOHC VVT-i liquid-cooled gasoline |
| Total Displacement: 164.4 cu.in (2.69 L) |
| Rated Engine Power: 150 Hp (112 kW) at 4800 rpm |
| Fuel System Type: Sequential multi-point electronic fuel injection |
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- Toyota 2AZ-FE Engine Specifications
- Toyota 2AR-FE Engine Specifications
- Toyota 3UR-FE Engine Specifications
| General Technical Data |
The Toyota 3RZ-FE is a 2.7-liter inline
four-cylinder gasoline engine that belongs to Toyota’s RZ family.
Introduced in 1994, it succeeded the older 22R-E engine as the company’s
largest four-cylinder powerplant and was primarily designed for light
trucks, SUVs, and off-road vehicles. Its robust construction, long
stroke, and large displacement provided excellent low-end torque and
reliability suited for demanding commercial and utility use. The 3RZ-FE
was installed in models such as the Toyota Hilux, Tacoma, 4Runner, and
Land Cruiser Prado. Known for its balance of simplicity, serviceability,
and strength, the engine employed a cast-iron block, aluminum cylinder
head, and a dual overhead camshaft layout with four valves per cylinder.
In 2004, Toyota introduced a revised version of the engine featuring
Variable Valve Timing with intelligence (VVT-i) on the intake camshaft.
This enhancement improved torque delivery, efficiency, and emissions
performance while retaining the original’s proven mechanical durability.
The 3RZ-FE became recognized globally as one of Toyota’s most reliable
large-capacity four-cylinder engines, capable of exceeding 400,000 km
(250,000 miles) with proper maintenance.
The 3RZ-FE has a displacement of 2,693 cc (164.4 cubic inches), achieved
through a bore of 95.0 mm (3.74 inches) and a stroke of 95.0 mm (3.74
inches). This square configuration balances torque and smoothness,
allowing high mechanical stability under heavy loads. The compression
ratio is 9.5:1 in standard form and slightly increased to approximately
10.0:1 in the later VVT-i variant. The firing order is 1-3-4-2, with
clockwise crankshaft rotation viewed from the flywheel side. The engine
operates on the four-stroke Otto cycle and features a DOHC valvetrain
with chain drive. The engine produced 152 PS (112 kW; 150 HP) at 4,800
rpm of maximum horsepower and 240 Nm (176.9 ft-lb) at 4,000 rpm of peak
torque.
The block is cast iron with reinforced main bearing webs and a deep
skirt design to enhance rigidity. The forged steel crankshaft is
supported by five main bearings with high-capacity oil galleries. The
connecting rods are forged steel, and the pistons are aluminum alloy
with anodized crowns and full-floating wrist pins. Each piston uses two
compression rings and one oil control ring. The engine incorporates
piston cooling oil jets to maintain optimal operating temperatures under
load. The crankshaft pulley includes a torsional damper to minimize
vibration at low rpm, contributing to smooth operation in truck
applications.
The aluminum alloy cylinder head houses dual overhead camshafts
operating four valves per cylinder—two intake and two exhaust—through
shim-over-bucket tappets. Valve diameters are approximately 37 mm (1.46
inches) intake and 30 mm (1.18 inches) exhaust. Camshaft timing is
driven by a double-row roller chain with a hydraulic tensioner and
plastic chain guides for noise reduction. In the standard 3RZ-FE, valve
timing is fixed, while in the VVT-i version, the intake camshaft is
equipped with an oil-controlled phasing mechanism capable of advancing
or retarding timing by approximately 30 degrees of crank rotation. This
system optimizes torque output across the rev range and reduces
emissions during part-throttle operation.
The combustion chambers are pent-roof type with centrally located spark
plugs, promoting efficient flame propagation. The cylinder head gasket
is multi-layer steel for improved sealing reliability.
| Fuel System |
The fuel system employs sequential multi-port electronic fuel injection (EFI) managed by the engine control unit (ECU). An electric in-tank fuel pump supplies fuel to the rail at approximately 300 kPa (43 psi). Each injector delivers precisely metered, atomized fuel into the intake ports near the valve seats. A manifold absolute pressure sensor and oxygen sensors provide feedback for closed-loop fuel control.
The system uses a return line to maintain constant fuel pressure differential relative to manifold vacuum. The throttle body is cable-actuated on early engines and electronically controlled in later VVT-i versions. Recommended fuel is unleaded gasoline with a minimum octane rating of 91 RON (87 AKI). Fuel filter replacement is recommended every 40,000 km (25,000 miles).
| Lubrication System |
The lubrication system is a fully pressurized wet-sump type utilizing a trochoid oil pump driven by the crankshaft. Oil is drawn through a pickup screen and distributed via main galleries to the crankshaft, connecting rods, camshafts, and valve train components. The engine includes oil jets for piston underside cooling. The full-flow oil filter is located on the right-hand side of the block.
Normal oil pressure is around 400 kPa (58 psi) at 3000 rpm and about 100 kPa (15 psi) at idle. The oil capacity including filter is approximately 5.5 liters (5.8 US quarts). Recommended oil viscosity is SAE 5W-30 or 10W-30 meeting API SJ or higher. Oil and filter should be replaced every 10,000 km (6,000 miles) or six months under normal service conditions.
| Cooling System |
The 3RZ-FE employs a liquid cooling system with a belt-driven centrifugal water pump. Coolant flows through the block, head, and radiator in a pressurized circuit maintained at about 88 kPa (13 psi). The thermostat begins to open at 82°C (180°F) and is fully open at 95°C (203°F). The radiator is aluminum with plastic tanks, and cooling is aided by an engine-driven viscous fan or dual electric fans depending on application.
Total coolant capacity is around 7.8 liters (8.2 US quarts). A 50/50 mixture of ethylene glycol antifreeze and water provides freeze protection to –35°C (–31°F). The system includes a coolant temperature sensor for ECU control and another for the instrument cluster gauge.
| Intake and Exhaust Systems |
The intake manifold is cast aluminum with long runners tuned for mid-range torque. A resonator chamber reduces intake noise. The air filter is a replaceable paper element located in a sealed airbox. The throttle body diameter is approximately 65 mm (2.56 inches). The exhaust manifold is tubular steel, feeding a catalytic converter positioned close to the cylinder head for quick warm-up. Some versions include an Exhaust Gas Recirculation (EGR) valve to reduce NOx emissions. In VVT-i engines, the improved intake timing reduces the need for aggressive EGR control.
| Ignition and Electrical System |
Early versions use a distributorless ignition system with twin coils firing paired cylinders (wasted-spark design). Later VVT-i models employ a coil-on-plug system, with each cylinder having an independent ignition coil. Spark plugs are typically NGK BKR5E or iridium-tipped equivalents, gapped at 1.1 mm (0.043 inch).
The alternator output is rated between 80 and 100 amperes, and the starter motor delivers 1.4 kW of cranking power. The battery system operates at 12 volts DC, and grounding is reinforced by heavy copper straps between engine and chassis.
| Timing Chain Drive |
The camshafts are driven by a heavy-duty roller chain, chosen for durability in commercial applications. Chain tension is maintained by a hydraulic tensioner fed by engine oil pressure. The chain and guides are designed to last the life of the engine with regular oil changes, though inspection is advised after 200,000 km (125,000 miles). The timing cover integrates the oil pump housing, minimizing component count and improving rigidity.
| Dimensions and Weight |
The 3RZ-FE engine’s overall length is approximately 610 mm (24 inches), width 630 mm (25 inches), and height 700 mm (27.6 inches). Dry weight is approximately 165 kg (364 lbs). The cast-iron block accounts for much of the weight, providing durability under heavy-duty use. Engine mounts employ large rubber isolators to reduce vibration transmission to the vehicle chassis.
| Maintenance Data |
Routine maintenance is essential to preserve reliability. Engine oil and filter should be changed every 10,000 km (6,000 miles). Air filter replacement is advised every 20,000 km (12,000 miles). Spark plugs are replaced every 40,000 km (25,000 miles) for standard plugs or 100,000 km (62,000 miles) for iridium types. Valve clearance inspection is recommended every 80,000 km (50,000 miles).
Coolant should be renewed every two years or 40,000 km (25,000 miles). The PCV valve and fuel filter are inspected at each major service. Compression pressure should read approximately 1,300 kPa (190 psi) per cylinder, with a minimum of 1,000 kPa (145 psi). Normal idle speed is 700 ± 50 rpm.
| Tightening Torques |
Cylinder head bolts: first stage 39 Nm (29 lb-ft), second stage 78 Nm
(58 lb-ft), final 90 degrees.
Main bearing cap bolts: 68 Nm (50 lb-ft).
Connecting rod bolts: 40 Nm (30 lb-ft) plus 90 degrees.
Camshaft bearing cap bolts: 13 Nm (10 lb-ft).
Crankshaft pulley bolt: 217 Nm (160 lb-ft).
Flywheel bolts: 83 Nm (61 lb-ft) plus 90 degrees.
Spark plugs: 18 Nm (13 lb-ft).
Oil drain plug: 40 Nm (30 lb-ft).
Intake manifold bolts: 25 Nm (18 lb-ft).
Exhaust manifold nuts: 35 Nm (26 lb-ft).
Valve cover bolts: 9 Nm (7 lb-ft).
Engine mount bolts: 60 Nm (44 lb-ft).
| Vehicle Applications |
The Toyota 3RZ-FE engine was widely installed in mid-size trucks, vans,
and SUVs from the mid-1990s through the mid-2000s.
Notable applications include:
– Toyota Hilux (LN/RZN series, 1994–2004)
– Toyota Tacoma (North American markets, 1995–2004)
– Toyota 4Runner (1996–2004)
– Toyota Land Cruiser Prado (90 and 120 series, certain markets)
– Toyota Hiace and Granvia vans
– Toyota Hilux Surf and Dyna light trucks.
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