The Renault M9R 786 is a 2,148 cc, inline‑four turbo‑diesel engine produced between 2015 and 2018. It features dual overhead camshafts (DOHC), 16 valves, and a single variable geometry turbocharger (VGT) for responsive low — end torque. In its primary 130 kW (177 PS) tune, it produces 380 Nm, positioning it as the highest — output variant within the M9R family for performance — oriented applications.
Fitted exclusively to premium variants of the Talisman and Espace V, the M…
All production years (2015–2018) meet Euro 6 compliance depending on market (VCA UK Type Approval #VCA/EMS/9877).
The Renault M9R 786 is a 2,148 cc inline‑four turbo‑diesel engineered for premium executive vehicles (2015-2018). It combines common‑rail direct injection with a single variable‑geometry turbocharger to deliver strong, accessible torque and confident highway performance. Designed to meet Euro 6 standards, it balances elevated power output with stringent emissions compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,148 cc | |
Fuel type | Diesel | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 85.0 mm × 95.0 mm | |
Power output | 130 kW (177 PS) @ 3,750 rpm | |
Torque | 380 Nm @ 1,750 rpm | |
Fuel system | Denso HP4 common‑rail (up to 1,800 bar) | |
Emissions standard | Euro 6 | |
Compression ratio | 15.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Single variable‑geometry turbo (Garrett) | |
Timing system | Chain-driven | |
Oil type | Renault RN0720 (SAE 5W‑30) | |
Dry weight | 168 kg |
The Renault M9R 786 was used across Renault's Talisman and Espace V platforms with transverse mounting. This engine received platform-specific adaptations-slightly different exhaust routing for the Espace-but no major facelift revisions affecting core compatibility occurred during its production run. All adaptations are documented in OEM technical bulletins.
The M9R 786's primary documented service concern is high-pressure fuel pump failure, with elevated incidence in vehicles subjected to frequent use of low-quality diesel or neglected fuel filter changes. Renault internal data indicates this was a common cause for no-start complaints, while UK DVSA records show no systemic emissions failures linked to this engine. Adherence to maintenance schedules and using correct fuel is critical to mitigate this risk.
Analysis derived from Renault technical bulletins (2015-2018) and UK DVSA failure statistics (2018-2023). 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 M9R 786 is generally robust, but its main weakness is the high-pressure fuel pump, which can fail prematurely if subjected to poor-quality diesel. With regular oil changes using RN0720 specification oil, use of high-quality diesel, and timely fuel filter replacements, these engines can reliably exceed 200,000 km. The timing chain is durable and rarely a concern.
The most frequent issues are high-pressure fuel pump failure (causing no-start), turbocharger VGT actuator failure (causing loss of power), EGR valve/carbon buildup, and DPF regeneration problems (often from short trips). These are well-documented in Renault service bulletins and are common across many modern diesel engines.
The M9R 786 2.1L dCi 177 engine was used exclusively in the Renault Talisman (2015-2018) and Espace V (2015-2018). It was the top-tier diesel option in these models, found only in the highest trim levels like Initiale and GT Line.
Yes, the M9R 786 responds very well to ECU remapping. Stage 1 tunes can reliably increase power to around 210-220 PS and torque to 450+ Nm by optimizing fuel and boost maps. The engine's internals are strong enough to handle this level of tuning. More aggressive tuning requires supporting modifications like an upgraded intercooler.
Real-world fuel economy is good considering its power output. Expect around 7.8 L/100km (36 mpg UK) in combined driving for a Talisman or Espace. Highway cruising can see figures closer to 6.2 L/100km (46 mpg UK), while city driving may be 10.0 L/100km (28 mpg UK) or higher, depending on traffic and driving style.
Yes. The M9R 786 is an interference engine. If the timing chain were to fail or jump significantly, the pistons would collide with the open valves, causing catastrophic internal damage. Fortunately, the timing chain is very robust and rarely fails if the engine is properly maintained.
Renault specifies RN0720 specification oil, typically SAE 5W-30 viscosity. This low-SAPS (Sulphated Ash, Phosphorus, Sulphur) oil is crucial for protecting the DPF and ensuring the longevity of the turbocharger and fuel system. Oil should be changed every 20,000 km or annually.
Comprehensive technical documentation and regulatory references
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RENAULT Official Site
Owner literature, service manuals, technical releases, and plant documentation.
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)
UK type-approval authority for automotive products.
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
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
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