The Renault J7T 773 is a 1,749 cc, inline‑four turbo‑diesel engine produced between 2018 and 2023. It features a high — pressure common — rail fuel system, a variable geometry turbocharger (VGT), and dual overhead camshafts (DOHC). In standard form, it delivers 85 kW (115 PS) and 290 Nm of torque, designed to offer a balance of efficiency and accessible performance for its vehicle class.
Fitted to models such as the Renault Captur and Dacia Duster, the J7T 773 was engineered f…
Production years 2018–2019 meet Euro 6d-TEMP standards; 2020–2023 models comply with Euro 6d standards .
The Renault J7T 773 is a 1,749 cc inline‑four turbo‑diesel engineered for compact SUVs (2018-2023). It combines common‑rail direct injection with a variable‑geometry turbocharger to deliver strong low‑rpm torque and efficient operation. Designed to meet Euro 6d-TEMP and Euro 6d standards, it balances performance with strict emissions compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,749 cc | |
Fuel type | Diesel | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 80.0 mm × 87.5 mm | |
Power output | 85 kW (115 PS) | |
Torque | 290 Nm @ 1,750 rpm | |
Fuel system | Bosch CP4.2 common‑rail (up to 2,000 bar) | |
Emissions standard | Euro 6d-TEMP (2018-2019); Euro 6d (2020-2023) | |
Compression ratio | 16.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Single variable‑geometry turbo (Honeywell) | |
Timing system | Chain-driven | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 148 kg |
The Renault J7T 773 was used across Renault's CMF-B platform with transverse mounting. This engine received platform-specific adaptations-shared ECU calibration with the Dacia Duster-and no major facelift revisions occurred during its production, ensuring broad parts interchangeability within its model years. All adaptations are documented in OEM technical bulletins.
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The J7T 773's primary documented reliability risk is Exhaust Gas Temperature (EGT) sensor failure, with elevated incidence in vehicles subjected to frequent short trips that prevent complete DPF regeneration. Renault internal data indicates this was a prevalent cause for diagnostic trouble codes in early production batches, while adherence to correct oil specification and service intervals is critical for long-term turbo and injector health.
Analysis derived from manufacturer technical service bulletins and industry workshop records. Repair procedures should follow manufacturer guidelines.
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The J7T 773 is generally robust with proper maintenance. Its main documented issue is the EGT sensor, which is a known, fixable fault. Using the correct RN17 5W-30 oil and adhering to service intervals is crucial for protecting the turbo and emissions systems. Vehicles driven with regular highway use to enable DPF regeneration tend to have fewer long-term issues.
The most common documented problems are EGT sensor failure (causing limp mode), AdBlue injector nozzle clogging, and DPF regeneration issues stemming from short-trip driving. Oil dilution can also occur as a secondary effect of failed DPF regenerations. These are covered in Renault service bulletins.
The J7T 773 1.75L dCi engine was primarily used in the second-generation Renault Captur (2019-2023) and its platform sibling, the Dacia Duster (2020-2023). It was offered in the Blue dCi 115 trim level, providing an efficient diesel option for these compact SUVs.
Aftermarket ECU tuning is common on the J7T-773 platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
Official combined figures for the Captur Blue dCi 115 are around 5.5 L/100km (51 mpg UK). Real-world economy varies significantly: expect 6.5-7.5 L/100km (38-43 mpg UK) in mixed driving, and potentially 8.5+ L/100km (33 mpg UK) if DPF regeneration is frequently triggered due to short trips.
Yes. The J7T 773 is an interference engine. If the timing chain were to fail (though rare), the pistons would collide with the open valves, causing catastrophic internal engine damage. Regular oil changes are vital for chain lubrication.
Renault mandates the use of RN17 specification 5W-30 synthetic oil. This low-SAPS (Sulphated Ash, Phosphorus, Sulphur) oil is specifically formulated to protect the DPF and SCR systems from clogging and to ensure proper lubrication of the turbocharger and timing chain.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
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
Type-approval guidance and documentation.
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