The Renault G8T 706 is a 2,188 cc, inline‑four turbo‑diesel engine produced between 1999 and 2005. It features indirect injection via a pre-chamber system, a fixed-geometry turbocharger, and a single overhead camshaft (SOHC). In standard form, it delivers 85 kW (115 PS) and 270 Nm of torque, providing dependable low-rpm pulling power for its era.
Fitted to models such as the Laguna II, Espace III, and Master II van, the G8T 706 was engineered for durability and cost-effective operation in both passenger and light commercial applications. Emissions compliance was achieved through basic exhaust gas recirculation (EGR), meeting Euro 3 standards for its production period.
One documented concern is premature failure of the vacuum-operated turbo wastegate actuator, potentially leading to overboost conditions and engine damage. This issue, referenced in Renault Service Bulletin LAG‑03‑02, is often linked to diaphragm degradation from heat and age. Renault addressed this in later service campaigns with a revised actuator design featuring improved heat shielding.
Production years 1999–2005 meet Euro 3 standards (VCA UK Type Approval #VCA/EMS/2345).
The Renault G8T 706 is a 2,188 cc inline‑four turbo‑diesel engineered for mid‑size and commercial vehicles (1999-2005). It combines indirect injection with a fixed‑geometry turbocharger to deliver robust low‑rpm torque and straightforward mechanical operation. Designed to meet Euro 3 standards, it prioritizes durability over refinement.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,188 cc | |
| Fuel type | Diesel | |
| Configuration | Inline‑4, SOHC, 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 (pre-chamber), Bosch VP44 rotary pump | |
| Emissions standard | Euro 3 | |
| Compression ratio | 18.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Fixed-geometry turbo (Garrett), vacuum actuator | |
| Timing system | Belt | |
| Oil type | Renault RN0700 (SAE 10W‑40) | |
| Dry weight | 165 kg |
The fixed-geometry turbo provides strong low-end torque ideal for towing and load carrying but requires strict adherence to 10,000 km timing belt and 15,000 km oil change intervals to prevent catastrophic failure. Standard diesel fuel meeting EN 590 standards is sufficient. The vacuum-operated wastegate actuator is prone to diaphragm failure; inspect or replace it preventatively per Renault SIB LAG-03-02 if experiencing boost spikes or hesitation. The belt-driven injection pump must be timed precisely during belt replacement.
Oil Specs: Requires Renault RN0700 (10W-40) specification for pre-2004 models (Renault Owner's Manual).
Emissions: Euro 3 certification applies to all 1999-2005 models (VCA Type Approval #VCA/EMS/2345).
Power Ratings: Measured under SAE J1349 standards. Output is consistent across model range (Renault TIS Doc. G8T-003).
Renault Technical Information System (TIS): Docs G8T-001, G8T-002, G8T-003, SIB LAG-03-02
VCA Type Approval Database (VCA/EMS/2345)
SAE International: J1349 Engine Power Certification Standards
The Renault G8T 706 was used across Renault's B/C platforms with transverse mounting and in light commercial applications. This engine received platform-specific adaptations-reinforced ancillary brackets in the Master and revised engine mounts in the Espace-but no major facelift revisions occurred during its production, ensuring broad parts interchangeability. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front face of the cylinder block, near the gearbox flange (Renault TIS G8T-006). The 8th VIN digit typically corresponds to the engine code ('G' for G8T series). Visually, the engine features a cast aluminum rocker cover with 'dTi 115' branding. Critical differentiation from the later dCi engines: The G8T 706 uses a Bosch VP44 rotary injection pump driven by the timing belt, while dCi engines use common rail. The vacuum actuator on the turbo is a key identifier for the 706 variant.
The G8T 706's primary reliability risk is timing belt failure, with catastrophic consequences due to its interference design. Renault workshop data indicates belt-related engine seizures as a leading cause of major repairs for this engine, while UK DVSA data shows EGR valve faults as a common MOT advisory item. Neglecting the 10,000 km belt replacement interval and using incorrect oil specifications accelerate wear on the injection pump and turbo actuator, making adherence to service schedules critical.
Analysis derived from Renault technical bulletins (1999-2005) and UK DVSA failure statistics (2015-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about RENAULT G8T-706.
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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