Toyota 1UR-FE 4.6L Engine Specs, Problems, Reliability. Time goes on, and Toyota has established a new UR family of powerful V8 engines to replace the old UZ engine family. The 1UR-FE is a Toyota’s 4.6-liter entirely aluminum V8 engine. It changed the old 2UZ-FE engine provided essentially in Toyota’s pickups and trucks (Toyota Tundra, Toyota Sequoia, Toyota Land Cruiser, etc). The Toyota 1UR-FE engine was first of all introduced in Lexus models for Middle East market, and after 2010 it became available for some Toyota’s pickups and trucks in the US and other nations.
Let’s take a more detailed look at the primary engine parts of the 1UR-FE. Among the crucial functions is the brand-new aluminum alloy cylinder block with spiny-type cast iron liners (the 2UZ had a traditional cast iron block). The brand-new block has the same 90-degree ‘V’ angle, 105.5 mm bore pitch and a 21.0 mm cylinder bank balanced out. The 1UR-FE kept the bore size of 94.0 mm while the stroke was a little minimized to 83.0 mm. The engine got the brand-new a created steel crankshaft.
This crankshaft has only 6 balance weights while predecessor’s crankshaft had eight balance weights. In this case, the 1UR-FE has less smoothness in operation. For decrease of noise and vibration, the 1UR crankshaft pulley has a torsional rubber damper. The engine has a created linking rods and aluminum pistons with a resin finish. The 1UR-FE already is equipped with four oil jets in the cylinder block to cool pistons by oil.
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Toyota 1UR-FE 4.6L Engine Specs, Problems, Reliability
The style layout of cylinder heads was entirely modified. The engine now has an aluminum alloy cylinder heads with apart camshaft housings. There are 2 camshafts for each cylinder bank, 4 valves per cylinder. However here is the 2nd key function of the brand-new engine: the 1UR-FE utilized timing chains (no undependable timing belts). Main timing chains drive the consumption camshafts, which operate the exhaust camshafts by a secondary timing chain on each head. The exhaust and intake valves are activated by roller rocker arms now, and the valvetrain is geared up with hydraulic lifters (no valve clearance modification required). Between the cylinder block and each head, there is a three-layer steel-laminate type cylinder head gasket.
The 1UR-FE engine has Toyota’s Double VVT-i system that controls both consumption and exhaust camshafts, as well as the currently familiar systems such as Acoustic Control Induction System (ACIS), Direct Ignition System (DIS) with long-life iridium-tipped spark plugs, and Electronic Throttle Control System – intelligent (ETCS-i). The engine utilizes the L-type consecutive fuel injection (SFI) and the twelve-hole fuel injectors. The exhaust system consists of the four-into-one (4-1) stainless steel headers, stainless steel exhaust pipes and catalytic converters for both ideal and left cylinder banks. The lower emission there is the water-cooled Exhaust Gas Recirculation (EGR) system and the air injection system for faster warm-up of the catalytic converters.
Toyota 1UR-FE 4.6L Engine Problems and Reliability
Despite the fact that the new engine has absolutely nothing comparable with the 2UZ-FE, they have joint problems. The water pump is still a source of leakages and concerns. It has a brief life – 60,000 miles (100,000 km), and it’s gone. Sometimes the hydraulic chain tensioner stops working, loosening the timing chain tension. In the early years of production, the engine was geared up with too thin unreliable valve springs. Some owners grumble about increased oil usage – up to 0.5 liters per 1000 miles. In the rest, the 1UR-FE engine has excellent durability and durability, nearly the same as the 2UZ-FE.
you must see more engine detail in here: Engine – US Cars News or you can see on wiki here
Toyota 1UR-FE 4.6L Engine Specs
| Manufacturer | Toyota Motor Corporation |
| Production years | 2006-present |
| Cylinder block material | Aluminum |
| Cylinder head material | Aluminum |
| Fuel type | Gasoline |
| Fuel system | Fuel injection |
| Configuration | V |
| Number of cylinders | 8 |
| Valves per cylinder | 4 |
| Valvetrain layout | DOHC |
| Bore, mm | 94.0 (3.7 in) |
| Stroke, mm | 83.0 (3.3 in) |
| Displacement, cc | 4,608 cc (281.2 cu in) |
| Type of internal combustion engine | Four-stroke, naturally aspirated |
| Compression Ratio | 10.2:1 – 1UR-FE; 11.8:1 – 1UR-FSE; |
| Power, hp | 304 hp (227 kW)/5,500 347 hp (259 kW)/6,400 385 hp (287 kW)/6,400 – 1UR-FSE; |
| Torque, lb ft | 324 lb-ft (439 Nm)/3,400 339 (460 Nm)/4,100 369 lb-ft (500 Nm)/4,100 – 1UR-FSE; |
| Engine weight | 476 lbs (216 kg) – 1UR-FE; 511 lbs (232 kg) – 1UR-FSE |
| Firing order | 1-8-7-3-6-5-4-2 |
| Engine oil weight | 5W-30 |
| Engine oil capacity, liter | 7.5 (7.9 qt) 0.4 (0.42 qt) – oil filter. |
| Oil change interval, mile | 10,000 (15,000 km) /12 month |
| Applications | Toyota Tundra, Toyota Sequoia, Toyota Land Cruiser, Lexus LS 460, Lexus GS 460, Lexus GX 460 |
Toyota 1UR-FE 4.6L Engine Modifications
The 1UR-FSE Engine. The 1UR-FSE engine is a more technologically advanced variation of the 1UR engine. This version has D-4S (Direct-injection 4-stroke Superior) injection system that included one injector in the consumption port and a second in the combustion chamber for each cylinder. The D-4S can provide direct injection mode just and both direct injection and port injection at the same time. The engine has actually increased compression ratio – 11.8:1. The 1UR-FSE efficiently replaced the 3UZ-FE in lots of Lexus models.