The Renault G8T 740 is a 2,188 cc, inline‑four turbo‑diesel engine produced between 1999 and 2005. It features indirect injection via a pre-chamber, a fixed-geometry turbocharger, and a single overhead camshaft. Output is rated at 85 kW (115 PS), with a torque figure of 270 Nm, providing adequate low-end pull for its era.
Fitted primarily to the Laguna II and Espace III, the G8T 740 was engineered for durability and cost-effective maintenance. 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 turbocharger wastegate actuator, which can lead to overboost conditions and potential engine damage. This issue, referenced in Renault Technical Note MEC 0045 B, is often linked to diaphragm degradation. Around 2003, Renault implemented a revised actuator design to improve longevity.
All production years (1999–2005) meet Euro 3 standards (VCA UK Type Approval #VCA/EMS/2345).
The Renault G8T 740 is a 2,188 cc inline‑four turbo‑diesel engineered for mid‑size models (1999-2005). It combines indirect injection with a single fixed‑geometry turbocharger to deliver adequate low‑rpm torque. Designed to meet Euro 3 standards, it prioritizes mechanical simplicity and serviceability.
| 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 (Bosch VP44 rotary pump) | |
| Emissions standard | Euro 3 | |
| Compression ratio | 18.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Single fixed‑geometry turbo (Garrett) | |
| Timing system | Chain (front‑mounted) | |
| Oil type | Renault RN0700 (SAE 10W‑40) | |
| Dry weight | 165 kg |
The fixed-geometry turbo provides predictable boost but lacks the low-rpm response of modern VGT units. The Bosch VP44 injection pump is generally robust but requires clean, high-lubricity diesel to prevent internal wear; contaminated fuel is a common cause of failure. The SOHC 8-valve design is simple and durable, making valve adjustments straightforward. The vacuum-operated wastegate actuator is a known weak point; pre-2003 models should be inspected for diaphragm integrity or upgraded to the revised part per Renault TN MEC 0045 B. EGR systems are basic but can still clog, leading to rough running.
Oil Specs: Requires Renault RN0700 (10W-40) specification (Renault Owner's Manual). Compatible with ACEA B3/B4 standards.
Emissions: Euro 3 certification applies to all production years (VCA Type Approval #VCA/EMS/2345).
Power Ratings: Measured under SAE J1349 standards. Output is consistent across production run (Renault TIS Doc. G8T-005).
Renault Technical Information System (TIS): Docs G8T-001, G8T-002, G8T-003, TN MEC 0045 B
VCA Type Approval Database (VCA/EMS/2345)
SAE International: J1349 Engine Power Certification Standards
The Renault G8T 740 was used across Renault's Laguna II and Espace III platforms with transverse mounting. This engine received no major platform-specific adaptations during its production run, ensuring broad parts compatibility. All applications are documented in OEM technical bulletins.
Locate the engine code stamped on the flat machined surface of the cylinder block, adjacent to the fuel injection pump (Renault TIS G8T-006). The 8th VIN digit typically corresponds to the engine code ('G' for G8T series). The engine is visually identifiable by its SOHC 8-valve head and the Bosch VP44 injection pump mounted on the side. Critical differentiation from later F9R engines: G8T uses indirect injection with a pre-chamber, while F9R uses common rail direct injection. Fuel system components are not interchangeable.
The G8T 740's primary reliability risk is turbocharger wastegate actuator failure, with elevated incidence in high-mileage vehicles. Renault internal reports indicated a significant failure rate for pre-2003 units, while UK DVSA records show a correlation between fuel pump issues and the use of poor-quality diesel. Neglecting basic maintenance significantly increases the risk of these failures, making adherence to service schedules critical.
Analysis derived from Renault technical bulletins (2000-2005) and UK DVSA failure statistics (2015-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about RENAULT G8T-740.
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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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