Toyota 3UR-FE

The Toyota 3UR-FE is a 5.7 L (5,663 cc, 345.6 cu·in) V8, four-stroke cycle water-cooled naturally aspirated internal combustion gasoline engine, from the UR-family, manufactured by the Toyota Motor Corporation since 2006.

The 3UR-FE engine has 8 cylinders in a V-arrangement at a bank angle of 90° The 3UR-FE features die-cast aluminum cylinder block with a five-bearings crankshaft and two aluminum heads with two chain-driven camshafts (DOHC) and four valves per cylinder (32 in total). The Toyota 3UR-FE engine is equipped with L-type sequential fuel injection (SFI) system, Direct Ignition System (DIS) ignition system with individual coils on each spark plug, Acoustic Control Induction System (ACIS), Electronic Spark Advance (ESA) and ETCS-i (Electronic Throttle Control System-intelligent). The engine also used a Dual VVT-i (Variable Valve Timing) system for the intake and exhaust camshafts.

It has a 94.0 mm (3.7 in) cylinder bore and 102.0 mm (4.02 in) piston stroke. Compression ratio rating is 10.2:1.

This engine produced from 362 PS (266 kW; 357 HP) at 5,600 rpm to 383 PS (282 kW; 378 HP) at 5,600 rpm of maximum horsepower and from 530 N·m (54 kg·m, 391 ft·lb) at 3,200 rpm to 546 N·m (55.7 kg·m, 402 ft·lb) at 3,600 rpm of peak torque depending on year and vehicle model.

The breakdown of the engine code is as follows:

• 3 – 3rd generation engine
• UR – Engine family
• F – Economy narrow-angle DOHC
• E – Multi Point Fuel Injection

General information

Cylinder block

The 3UR-FE engine has a die-cast aluminum cylinder block in a V arrangement at a bank angle of 90°. This engine’s firing order is 1-8-7-3-6-5-4-2. The crankshaft is supported by five main bearings. These bearings are made of aluminum alloy. The engine is equipped with forged steel crankshaft with five journals and six balance weights.

The 3UR-FE engine used forged connecting rods with resin-coated aluminum bearings. Pistons are made of high temperature-resistant aluminum alloy and they are cooled by four oil jets in the cylinder block. Piston pins are the full-floating type. The Toyota 3UR-FE motor has two compression and one oil control rings.

Bore and stroke are 94.0 mm (3.7 in) and 102.0 mm (4.02 in), respectively. Compression ratio rating is 10.2:1.

Main bearing cap bolts tightening procedure and torque specs:

• Step 1:
  Inside: 61 Nm; 6.2 kg·m; 45 ft·lb
  Outside: 27 Nm; 2.7 kg·m; 20 ft·lb
• Step 2: Turn bolts 90°
• Cylinder block side 45 Nm; 4.6 kg·m; 33 ft·lb

After securing bearing cap bolts, make sure crankshaft turns smoothly by hand.

Connecting rod bearing bolts

• Step 1: 40 Nm; 4.0 kg·m; 30 ft·lb
• Step 2: Turn bolts 90°

Cylinder head

The cylinder heads are made of aluminum alloy. The 3UR-FE engine has dual overhead camshafts design (DOHC) with four valves per cylinder (2 intakes and 2 exhaust). The 3UR-FE engine used primary timing chains for the intake camshafts and each exhaust camshaft is driven by a secondary timing chain from the intake camshaft. The 3UR-FE engine had Dual VVT-i to control the intake and exhaust camshafts.

Intake duration is 248 degrees and exhaust duration is 242 degrees. For valve clearance adjustment this engine used hydraulic lash adjuster which is actuated by engine oil supplied from the cylinder head and an integrated spring.

Head tightening procedure and torque specs:

• Step 1: 36 Nm; 3.67 kg·m; 27 ft·lb
• Step 2: Turn all bolts 90°
• Step 3: Turn all bolts another 90°
• For 12 mm head: 21 Nm; 2.14 kg·m; 15 ft·lb

Maintenance data

Vehicle applications

Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.