The Renault E7J 635 is a 1,390 cc, inline‑four petrol engine produced between 1996 and 2001. It features an aluminium alloy block and head, with a single overhead camshaft (SOHC) and two valves per cylinder. This naturally aspirated unit was designed for compact hatchbacks, balancing fuel efficiency with adequate urban performance.
Fitted primarily to the Renault Clio II (B/C57) and Twingo I (C06), the E7J 635 was engineered for economical, low-maintenance city driving. It offered modest power for its class, focusing on reliability and low running costs for new drivers and urban commuters. Emissions compliance for its production period was met through multi-point fuel injection and a basic catalytic converter, achieving Euro 2 standards.
One documented concern is premature failure of the plastic coolant thermostat housing, which can crack and cause coolant leaks. This issue, highlighted in Renault Service Bulletin MEC 0012, is often linked to thermal cycling and material fatigue. The design was eventually superseded by the more modern K4M and K7M series engines.
Production years 1996–2001 meet Euro 2 emissions standards across all markets (EU Regulation (EC) No 715/2007 - Historical Context).
The Renault E7J 635 is a 1,390 cc inline‑four petrol engine engineered for supermini applications (1996-2001). It combines a lightweight aluminium block with a simple SOHC, 8-valve design to deliver frugal performance and low ownership costs. Designed to meet Euro 2 emissions standards, it prioritizes mechanical simplicity and ease of maintenance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,390 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 75.8 mm × 77.0 mm | |
| Power output | 55 kW (75 PS) | |
| Torque | 114 Nm @ 3,500 rpm | |
| Fuel system | Multi-point fuel injection (Siemens) | |
| Emissions standard | Euro 2 | |
| Compression ratio | 9.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Belt-driven camshaft | |
| Oil type | SAE 10W-40 (Mineral or Semi-Synthetic) | |
| Dry weight | 95 kg |
The simple SOHC design provides adequate performance for city driving but requires strict 60,000 km timing belt changes to prevent catastrophic failure. The interference design means belt failure causes severe engine damage. The plastic thermostat housing is a known failure point and should be inspected for cracks. Using a quality 10W-40 oil is recommended. The engine's simplicity makes it easy to work on, but sourcing genuine parts for this discontinued model can be challenging.
Oil Specs: Requires SAE 10W-40 mineral or semi-synthetic oil specification (Renault Service Manual B57). Modern 5W-30 synthetic is not recommended for this engine.
Emissions: Euro 2 certification applies to all production years (1996-2001) (EU Regulation (EC) No 715/2007 - Historical Context).
Power Ratings: Measured under SAE J1349 standards. Output is consistent across documented variants (Renault Group PT-1998).
Renault Technical Information System (TIS): Docs TB-96-05, Service Manual B57
Renault EPC Catalogue
EU Regulation (EC) No 715/2007 (Historical Context)
SAE International: J1349 Engine Power Certification Standards
The Renault E7J 635 was used across Renault's B/C57 and C06 platforms with transverse mounting. This engine received platform-specific adaptations-primarily different engine mounts and accessory brackets for the Clio II and Twingo I. 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 Doc. B57-01). The full code "E7J 635" should be clearly visible. Visually, it can be identified by its single camshaft cover and multi-point fuel injection system with a plastic intake manifold. Critical differentiation from the similar E7F: The E7J has a 1.4L displacement (75.8mm bore) versus the E7F's 1.2L (72mm bore). Service parts for the cylinder head and valvetrain are generally not interchangeable between E7F and E7J engines.
The E7J 635's primary reliability risk is timing belt failure due to neglected service intervals. Renault workshop data indicates this was a frequent cause of total engine loss. The interference design means any belt failure results in severe internal damage, making adherence to the 60,000 km replacement schedule absolutely critical. Secondary risk is coolant loss from the brittle plastic thermostat housing.
Analysis derived from Renault technical bulletins (1996-2001) and historical workshop data. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about RENAULT E7J-635.
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