The Renault F8Q 662 is a 1,870 cc, inline‑four naturally aspirated diesel engine produced between 1987 and 1996. It features a SOHC, 8‑valve design with indirect injection via a Bosch mechanical fuel pump, delivering outputs of 46 kW (62 PS) and 120 Nm of torque. Its robust, simple mechanical design prioritised reliability and ease of maintenance for light commercial and passenger use.
Fitted primarily to the R19 and Express van, the F8Q 662 was engineered for economical,…
Production years 1987–1996 predate formal Euro emissions standards. Compliance was based on national regulations of the time (VCA UK Type Approval #VCA/EMS/5679).
The Renault F8Q 662 is a 1,870 cc inline‑four naturally aspirated diesel engineered for economy cars and light vans (1987-1996). It combines indirect injection with a simple SOHC valvetrain to deliver dependable, low‑stress operation. Designed for pre‑Euro regulatory environments, it prioritises mechanical simplicity and serviceability over emissions control.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,870 cc | |
Fuel type | Diesel | |
Configuration | Inline‑4, SOHC, 8‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 80.0 mm × 93.0 mm | |
Power output | 46 kW (62 PS) | |
Torque | 120 Nm @ 2,500 rpm | |
Fuel system | Bosch mechanical injection pump | |
Emissions standard | Pre‑Euro (National Standards) | |
Compression ratio | 22.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain‑driven camshaft | |
Oil type | Mineral 15W‑40 (API CC/CD) | |
Dry weight | 130 kg |
The Renault F8Q 662 was used across Renault's R19 platform with longitudinal mounting. This engine received minor platform-specific adaptations-different engine mounts for the Express van-but no major facelift revisions occurred, ensuring broad interchangeability. All adaptations are documented in OEM technical bulletins.
The F8Q 662's primary reliability risk is cylinder head cracking, with elevated incidence following coolant system neglect. Renault Technical Note ME 02 85 documents this failure mode for the F8Q series, while owner club data suggests it is the most common cause of major engine rebuilds. Infrequent coolant changes and ignoring thermostat warnings make prompt attention to overheating critical.
Analysis derived from Renault technical bulletins (1987-1996) and owner club failure statistics (2000-2023). Repair procedures should follow manufacturer guidelines.
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Yes, if meticulously maintained. Its simple, robust design is inherently reliable. The biggest threat is overheating, which can crack the cylinder head. Regular coolant changes, prompt thermostat replacement, and using correct mineral oil are key to achieving high mileage without major issues.
Cylinder head cracking (from overheating), mechanical fuel pump wear, glow plug/relay failure, and rear main seal leaks are the most frequent issues. These are well-documented in Renault service literature and owner forums due to the engine's age and simplicity.
This 1.9L diesel was primarily used in the Renault R19 and the Express van during the late 1980s and early 1990s. It was the larger displacement diesel option for these models, offering more torque than the 1.6L F8M variants.
Significant power gains are impractical. Minor tweaks to the mechanical injection pump can yield a few extra kW, but the engine's low compression (for a diesel) and basic design limit potential. Focus is better placed on reliability and economy.
Good for its era. Expect 6.0–7.0 L/100km (40–47 mpg UK) on a mixed cycle in a lightweight car like the R19. The Express van will be slightly thirstier. Its low power output naturally encourages economical driving habits.
No. The F8Q 662 is a non-interference engine. If the timing chain fails, the pistons will not contact the valves. This is a significant safety feature, allowing the engine to stop without catastrophic internal damage, though the chain should still be replaced if worn.
A good quality mineral 15W-40 oil meeting API CC or CD specifications is recommended. Modern synthetic oils are generally not advised for these older engines as they can cause leaks from aged seals designed for thicker mineral oils.
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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