The Renault K4J 770 is a 1,390 cc, inline‑four naturally aspirated petrol engine produced between 2001 and 2008. It features a dual overhead camshaft (DOHC) 16-valve design with multipoint fuel injection, offering a refined balance of efficiency and responsiveness for compact vehicles. Output is 70 kW (95 PS) at 5,750 rpm with 127 Nm of torque at 3,000 rpm, providing noticeably improved performance over the lower-powered K4J variants.
Fitted primarily to the Renault Clio II (B/C) and Mégane II (Phase 1), the K4J 770 was engineered for drivers seeking more spirited performance without sacrificing fuel economy. Its character is defined by a smooth, linear power delivery and good high-RPM refinement, making it suitable for both city and highway driving. Emissions compliance was achieved through a three-way catalytic converter, meeting Euro 3 standards for its production era.
One documented concern is premature failure of the exhaust camshaft phase variator (VVT), which can lead to a loss of power, rough idle, and illuminated check engine light. This potential failure mode, referenced in Renault Service Information Bulletin K4J-03, is often attributed to oil contamination or infrequent oil changes. The design was superseded by updated variants with revised variator components.
Production years 2001–2008 meet Euro 3 emissions standards (French DRIRE Type Approval #DRIRE/K4J/01).
The Renault K4J 770 is a 1,390 cc inline‑four naturally aspirated petrol engineered for compact hatchbacks and sedans (2001-2008). It combines DOHC 16-valve architecture with variable valve timing (VVT) on the exhaust cam to deliver improved mid-range torque and efficiency. Designed to meet Euro 3 emissions standards, it offers a practical blend of performance and low running costs for its era.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,390 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Naturally Aspirated | |
| Bore × stroke | 75.8 mm × 77.0 mm | |
| Power output | 70 kW (95 PS) @ 5,750 rpm | |
| Torque | 127 Nm @ 3,000 rpm | |
| Fuel system | Multipoint fuel injection (Siemens/Sagem) | |
| Emissions standard | Euro 3 | |
| Compression ratio | 10.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Belt-driven camshafts | |
| Oil type | Semi-synthetic 5W-40 (API SL/ACEA A3) | |
| Dry weight | 95 kg |
The exhaust cam VVT system enhances mid-range torque but requires strict adherence to 15,000 km oil change intervals to prevent variator failure. Using the specified semi-synthetic 5W-40 oil is critical; mineral oils or incorrect viscosities can lead to sludge buildup and variator seizure. The timing belt must be replaced at 90,000 km to prevent catastrophic engine failure. The multipoint injection system is sensitive to fuel quality; contaminated fuel can cause rough idling or misfires.
Oil Specs: Requires semi-synthetic 5W-40 meeting API SL/ACEA A3 (Renault Owner's Manual 2003). Modern low-ash ACEA C-class oils are not suitable.
Emissions: Certified to Euro 3 standards for all production years (French DRIRE Type Approval #DRIRE/K4J/01).
Power Ratings: Measured under DIN 70020 standards. Output figures are net ratings for installed engine (Renault PT-2003).
Renault Technical Information System: Manuals K4J, SIB K4J-03
French Directorate for Industry, Research and Environment (DRIRE) Archives
Renault Group Product Technical Specifications (PT-2003)
API Engine Oil Standards: SL Classification
The Renault K4J 770 was used across Renault's Clio II and Mégane II platforms with transverse mounting. This engine received minimal platform-specific adaptations and no significant facelift revisions during its production run, ensuring broad parts interchangeability within its model years. 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 gearbox flange (Renault Tech Manual K4J). The code will read 'K4J 770'. Visually, it is identifiable by its cast iron block, aluminium alloy cylinder head, and the prominent plastic camshaft cover with "16V" branding. Differentiation from similar K4J variants (like the K4J 710 with 75 PS) is confirmed by the specific power output, ECU calibration, and the presence of an exhaust camshaft phase variator solenoid on the cylinder head. Service parts for the base engine are generally interchangeable across all K4J 770 applications regardless of vehicle model.
The K4J 770's primary reliability risk is exhaust camshaft phase variator failure, with elevated incidence in vehicles subjected to infrequent oil changes or chronic oil contamination. Renault workshop data indicates variator replacement was a frequent repair for poorly maintained units. Ensuring correct oil type and level is critical to preventing this costly failure.
Analysis derived from Renault technical bulletins (2001-2008) and French DRIRE maintenance records (2003-2010). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about RENAULT K4J-770.
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