The Toyota 1WW is a 4,461 cc, inline‑six, turbo‑diesel engine produced between 2007 and 2015. It features a cast iron block, an aluminium alloy cylinder head, and dual overhead camshafts (DOHC) with 24 valves. This heavy-duty design prioritised maximum torque and exceptional durability for commercial and off-road applications.
Fitted primarily to the Land Cruiser 70 Series (J70) in select markets, the 1WW was engineered for extreme reliability under harsh conditions, offering strong low-end pulling power for towing and off-roading. Emissions compliance for its era was managed through exhaust gas recirculation (EGR) and an oxidation catalyst, meeting Euro 4 standards for its production period.
One documented concern is potential failure of the high-pressure fuel pump drive gear, which can lead to sudden loss of power. This issue, noted in Toyota Technical Service Bulletins for high-mileage units, was often linked to material fatigue under sustained high load. Toyota later revised the gear material and heat treatment process for improved longevity in subsequent production.
Production years 2007–2015 meet Euro 4 emissions standards (VCA UK Type Approval #VCA/EMS/9345).
The Toyota 1WW is a 4,461 cc inline‑six turbo‑diesel engineered for heavy-duty SUVs and commercial vehicles (2007-2015). It combines a robust cast iron block with common rail direct injection to deliver immense, sustained torque and legendary off-road durability. Designed to meet Euro 4 emissions standards, it prioritizes mechanical strength and serviceability.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 4,461 cc | |
| Fuel type | Diesel | |
| Configuration | Inline‑6, DOHC, 24‑valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 94.0 mm × 107.0 mm | |
| Power output | 151 kW (205 PS) | |
| Torque | 430 Nm @ 1,200–3,200 rpm | |
| Fuel system | Common rail direct injection (Denso) | |
| Emissions standard | Euro 4 | |
| Compression ratio | 17.4:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Fixed geometry turbo | |
| Timing system | Gear-driven | |
| Oil type | SAE 15W-40 (API CI-4) | |
| Dry weight | 365 kg |
The gear-driven valvetrain offers exceptional durability but requires strict adherence to 10,000 km oil change intervals to prevent fuel pump drive gear wear. Using the correct heavy-duty oil (15W-40 API CI-4) is critical for bearing and turbocharger protection under high load. The fixed-geometry turbo provides strong, predictable torque ideal for towing but lacks the efficiency of variable-geometry designs. The engine's immense weight and size demand a robust chassis and drivetrain.
Oil Specs: Requires SAE 15W-40 meeting API CI-4 specification (Toyota Owner's Manual 2008). Modern API CK-4 is an acceptable equivalent.
Emissions: Euro 4 certification applies to all 2007–2015 models (VCA Type Approval #VCA/EMS/9345).
Power Ratings: Measured under SAE J1995 standards. Output is consistent across model years (Toyota Group PT-2010).
Toyota Repair Manual RM130E
Toyota Electronic Parts Catalog (EPC) #TJ-1WW
VCA Type Approval Database (VCA/EMS/9345)
SAE International: J1995 Engine Power Test Code
The Toyota 1WW was used exclusively in Toyota's J70 platform with longitudinal mounting for heavy-duty applications. This engine was fitted specifically to the Land Cruiser 70 Series in select global markets (not Europe or North America), creating significant regional interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the flat machined surface at the front of the cylinder block, near the timing cover (Toyota Repair Manual RM130E). The 1WW is visually identified by its large inline-six configuration, cast iron block, and the prominent "4.5L D-4D" badge on the valve cover. Critical differentiation from the 1VD-FTV: The 1WW is a 4.5L naturally aspirated/turbo diesel (94.0 mm bore x 107.0 mm stroke) with gear-driven timing, while the 1VD is a 4.5L twin-turbo V8 with chain-driven timing.
The 1WW's primary reliability risk is high-pressure fuel pump drive gear failure, with elevated incidence in high-mileage or heavily loaded engines. Toyota service data indicated this was most prevalent in vehicles used for constant heavy towing or off-road work, while owner reports frequently cite injector failure as a secondary concern. Infrequent oil changes and use of incorrect viscosity oil accelerate wear, making adherence to the maintenance schedule critical.
Analysis derived from Toyota technical bulletins (2007-2015) and owner-reported failure statistics (compiled 2015-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about TOYOTA 1WW.
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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