The Renault F8Q 678 is a 1,870 cc, inline‑four turbo‑diesel engine produced between 1996 and 2000. It features a cast iron block, aluminium cylinder head, and single overhead camshaft (SOHC) with 8 valves. Equipped with indirect injection and a fixed — geometry turbocharger, it delivered approximately 50 kW (68 PS) and 135 Nm of torque, prioritising low — cost ownership and urban drivability.
Fitted primarily to the Clio II (B/CB0/1) and Kangoo I (KC) platforms, the F8Q 67…
Production years 1996–2000 meet Euro 2 standards for light-duty vehicles (EU Directive 96/69/EC).
The Renault F8Q 678 is a 1,870 cc inline‑four turbo‑diesel engineered for compact hatchbacks and vans (1996-2000). It combines indirect injection with a fixed-geometry turbocharger to deliver accessible low-end torque and robust mechanical simplicity. Designed to meet Euro 2 emissions standards, it prioritises serviceability and cost-effective ownership.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,870 cc | |
Fuel type | Diesel | |
Configuration | Inline‑4, SOHC, 8‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 80.0 mm × 93.0 mm | |
Power output | 50 kW (68 PS) @ 4,500 rpm | |
Torque | 135 Nm @ 2,500 rpm | |
Fuel system | Bosch VE rotary injection pump (indirect injection) | |
Emissions standard | Euro 2 | |
Compression ratio | 21.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Fixed‑geometry (Garrett) | |
Timing system | Belt‑driven (non-interference design) | |
Oil type | Mineral 15W‑40 | |
Dry weight | Not specified in primary sources |
The Renault F8Q 678 was used across Renault's Clio II and Kangoo I platforms with transverse mounting. This engine received minor platform-specific adaptations-such as different exhaust manifolds or engine mounts-but no major facelift revisions affecting core compatibility during its production run. All adaptations are documented in OEM technical bulletins.
The F8Q 678's primary reliability risk is EGR valve clogging due to carbon deposits, particularly in high-mileage or urban-driven examples. Renault internal service data indicates this is the most frequent cause of drivability complaints for this engine. Extended idling and infrequent oil changes accelerate carbon buildup, making proactive cleaning critical.
Analysis derived from Renault technical bulletins (1996-2000) and EU regulatory documentation (1996-2000). Repair procedures should follow manufacturer guidelines.
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The F8Q 678 is mechanically simple and robust, making it potentially very reliable with proper care. Its main weakness is the EGR valve, which requires periodic cleaning. With proactive EGR maintenance, regular oil changes using the correct mineral oil, and attention to the injection pump, these engines can easily reach high mileages.
The most frequent issue is EGR valve clogging, causing rough idle and drivability problems. Other common problems include wear in the mechanical Bosch VE injection pump, glow plug system failures (plugs or relay), and cooling system leaks from aging hoses or the water pump. These are well-documented in Renault service literature.
The F8Q 678 was primarily used in the second-generation Renault Clio (B/CB0/1, 1996-2000) and the first-generation Renault Kangoo (KC, 1996-2000) across various trim levels like RN, RT, and Expression. It was the entry-level diesel option for these platforms during that era.
Minor power gains are possible by adjusting the Bosch VE injection pump's maximum fuel screw, but this is not recommended without supporting modifications and carries risks. Significant tuning is impractical due to the engine's indirect injection design and fixed-geometry turbo. Focus should be on maintaining reliability rather than seeking power increases.
Fuel economy is good for its time and technology. Expect around 6.0-7.0 L/100km (47-40 mpg UK) combined for a Clio II in good condition. City driving will be higher, around 7.5-8.5 L/100km (38-33 mpg UK), while highway cruising can drop to 5.0-5.5 L/100km (56-51 mpg UK).
No. This is a significant advantage. The F8Q 678 features a non-interference engine design. If the timing belt breaks, the pistons will not contact the valves, preventing catastrophic internal engine damage. The engine will simply stop running and need a new belt to restart.
Renault specifies a mineral-based 15W-40 engine oil for the F8Q 678. Using modern low-viscosity or fully synthetic oils is not recommended, as they may not provide adequate protection for the engine's older design and bearing clearances.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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