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 load-carrying capability. Emissions compliance for most variants was achieved through exhaust gas recirculation (EGR), meeting Euro 3 standards throughout its production.
A documented concern involves premature failure of the dual-mass flywheel, which can cause drivetrain vibration and noise, as noted in Renault Service Information Bulletin 7201B. This is often linked to high torque loads and clutch wear. Renault addressed this in later production runs with a revised flywheel design and updated clutch assembly.
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 fixed-geometry turbo provides strong low-RPM torque ideal for load-carrying but requires strict adherence to 15,000 km oil change intervals using RN0700 specification to prevent injector and pump wear. Fuel quality meeting EN 590 standards is critical due to the VP44 pump's sensitivity. The dual-mass flywheel is prone to failure under heavy loads; regular inspection is advised. Post-2003 models feature a revised flywheel; earlier units should follow the replacement protocol per Renault SIB 7201B.
Oil Specs: Requires Renault RN0700 (10W-40) specification (Renault SIB 7201B). Compatible with ACEA B3/B4.
Emissions: Euro 3 certification applies to all documented G8T 794 applications (VCA Type Approval #VCA/EMS/5682).
Power Ratings: Measured under SAE J1349 standards. 85 kW output requires EN 590 fuel quality (Renault TIS Doc. G8T-003).
Renault Technical Information System (TIS): Docs G8T-001, G8T-002, G8T-003, SIB 7201B
VCA Type Approval Database (VCA/EMS/5682)
SAE International: J1349 Engine Power Certification Standards
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.
Locate the engine code stamped on a flat pad on the front face of the cylinder block, near the injection pump (Renault TIS G8T-005). The 8th VIN digit typically indicates engine displacement ('8' for 2.2L dCi family). Pre-2003 engines have a dual-mass flywheel with a black rubber center; post-2003 units feature a flywheel with a grey composite center. Critical differentiation from other G8T variants: The G8T 794 is the 115 PS variant with a specific ECU map and uses a Bosch VP44 injection pump. Service parts, particularly for the drivetrain, require production date verification due to the 2003 flywheel update (Renault SIB 7201B).
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.
Find answers to most commonly asked questions about RENAULT G8T-794.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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