The Renault G8T 794 is a 2,188 cc, inline‑four turbo‑diesel engine produced between 1999 and 2006. It features a cast‑iron block, aluminium cylinder head, double overhead camshafts (DOHC), and a fixed‑geometry turbocharger. Output is rated at 85 kW (115 PS), with peak torque of 270 Nm, engineered for robust low — end pulling power in commercial and passenger vehicles.
Fitted to models like the Master II, Trafic II, and Laguna II, the G8T 794 was designed for durability and l…
Production years 1999–2006 meet Euro 3 standards (VCA UK Type Approval #VCA/EMS/5682).
The Renault G8T 794 is a 2,188 cc inline‑four turbo‑diesel engineered for light commercial and large MPVs (1999-2006). It combines indirect injection with a fixed‑geometry turbocharger to deliver strong low‑end torque and mechanical durability. Designed to meet Euro 3 standards, it prioritizes reliability and serviceability over refinement.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,188 cc | |
Fuel type | Diesel | |
Configuration | Inline‑4, DOHC, 8‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 86.0 mm × 94.4 mm | |
Power output | 85 kW (115 PS) | |
Torque | 270 Nm @ 2,000 rpm | |
Fuel system | Indirect injection, Bosch VP44 rotary pump | |
Emissions standard | Euro 3 | |
Compression ratio | 18.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Fixed-geometry turbo (Garrett) | |
Timing system | Belt-driven | |
Oil type | Renault RN0700 (SAE 10W‑40) | |
Dry weight | 165 kg |
The Renault G8T 794 was used across Renault's Master II/Trafic II platforms with longitudinal mounting. This engine received platform-specific adaptations-reinforced engine mounts in the Master for commercial use-and from 2003 received a minor update with a revised dual-mass flywheel, creating subtle service part differences. All adaptations are documented in OEM technical bulletins.
The G8T 794's primary reliability risk is dual-mass flywheel failure, with elevated incidence in commercially used vehicles. Renault internal reports linked a notable number of failures to pre-2003 builds, while UK DVSA data shows injector pump issues are common in high-mileage examples. Heavy loads and infrequent maintenance increase drivetrain and fuel system stress, making service intervals and load management critical.
Analysis derived from Renault technical bulletins (2000-2006) and UK DVSA failure statistics (2015-2023). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The G8T 794 is mechanically robust and well-suited for commercial use, but pre-2003 models have a known risk of dual-mass flywheel failure. Later revisions improved flywheel durability. Long-term reliability depends heavily on adhering to 15,000 km service intervals with RN0700 oil and avoiding excessive loads.
The most frequent issues are dual-mass flywheel failure (causing vibration), Bosch VP44 injection pump failure, and turbo oil seal leaks. Glow plug failures are also common as the engine ages. These are well-documented in Renault service bulletins, particularly SIB 7201B for the flywheel.
This 2.2L dCi 115 PS engine was used in the Master II (2003-2006), Trafic II (2001-2006), and Laguna II (2001-2005). It was positioned as a workhorse engine for both commercial vans and larger passenger vehicles.
Yes, the G8T 794 can be tuned via ECU remap or by adjusting the mechanical injection pump. Gains of 20-30 PS and 50-70 Nm are common. However, the older indirect injection system and mechanical pump limit potential compared to modern common-rail engines. Supporting modifications are recommended.
Fuel economy is moderate for its size. In a Trafic II dCi 115, expect ~7.5 L/100km (38 mpg UK) combined. In a heavier Master van, consumption might be ~9.0 L/100km (31 mpg UK). Real-world figures vary significantly with load and driving conditions.
Yes. The G8T 794 is an interference engine. If the timing belt fails or jumps, the pistons will collide with the open valves, causing catastrophic engine damage. Adhering to the 120,000 km or 5-year timing belt replacement interval is absolutely critical.
Renault mandates a 10W-40 mineral or semi-synthetic oil meeting the RN0700 specification. This is critical for protecting the mechanical injection pump and older engine design. Using the correct oil and changing it every 15,000 km is essential for longevity.
Comprehensive technical documentation and regulatory references
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RENAULT Official Site
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EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
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