The Renault F8M 730 is a 1,596 cc, inline‑four naturally aspirated diesel engine produced between 1985 and 1996. It features a SOHC, 8‑valve design with indirect injection via a Bosch mechanical fuel pump. This robust and simple powerplant was engineered for durability and fuel economy in light commercial and passenger vehicles, delivering modest outputs around 42 kW (57 PS) and 100 Nm of torque.
Fitted to models such as the R5, R9, R11, Express, and early Kangoo, the F8M 730 was designed for economical, low‑stress urban and regional driving. Its mechanical simplicity prioritised ease of maintenance and repair over refinement or performance. Emissions compliance was basic for its era, generally meeting pre‑Euro or early Euro 1 standards depending on the specific model year and market.
One documented concern is cylinder head cracking, particularly between cylinders 2 and 3, often linked to overheating events or coolant system neglect. This issue, referenced in Renault service documentation, is typically caused by thermal stress. The design was eventually superseded by the more modern F8Q engine family.
Production years 1985–1996 predate formal Euro standards; emissions compliance is based on national regulations of the era (VCA UK Type Approval applicable for registered imports).
The Renault F8M 730 is a 1,596 cc inline‑four naturally aspirated diesel engineered for compact cars and light vans (1985-1996). It combines indirect injection with a simple SOHC valvetrain to deliver dependable, economical performance for low‑stress driving. Designed for pre‑Euro era regulations, it prioritises mechanical simplicity and ease of maintenance over refinement.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,596 cc | |
| Fuel type | Diesel | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Naturally Aspirated | |
| Bore × stroke | 78.0 mm × 83.5 mm | |
| Power output | 42 kW (57 PS) @ 5,000 rpm | |
| Torque | 100 Nm @ 2,500 rpm | |
| Fuel system | Bosch mechanical indirect injection pump | |
| Emissions standard | Pre‑Euro / National Standards | |
| Compression ratio | 21.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain‑driven camshaft | |
| Oil type | Mineral 15W‑40 (API CC/CD) | |
| Dry weight | 125 kg |
The mechanical injection system provides predictable, if sluggish, performance but requires precise pump timing adjustments for optimal running. Regular coolant system maintenance is critical to prevent cylinder head cracking, a known failure point. Using the specified mineral oil helps maintain lifter and pump longevity. The chain-driven camshaft is generally robust but should be inspected for wear and tension at major services. Fuel filter changes are vital to protect the injection pump from contamination.
Oil Specs: Requires mineral 15W-40 meeting API CC/CD specifications (Renault Service Manual 77 11 065 999). Modern low-ash oils are not recommended.
Emissions: Formal Euro standards did not apply during production (1985-1996). Compliance was based on national vehicle regulations (VCA Historical Database).
Power Ratings: Measured under EEC 80/1269 standards. Output is consistent across applications with minor variations for specific models (Renault Homologation Sheet).
Renault Service Manual (Ref: 77 11 065 999)
Renault Technical Bulletin TB 412
Renault EPC (Electronic Parts Catalogue)
UK Vehicle Certification Agency (VCA) Historical Database
The Renault F8M 730 was used across Renault's R5/R9/R11 platforms with transverse mounting. This engine received minor platform-specific adaptations-different engine mounts for the Express van-but no major facelift revisions occurred, ensuring broad parts interchangeability. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on a flat pad on the block, typically near the gearbox flange or on the front face below the cylinder head (Renault Service Manual 77 11 065 999). The full code for this variant is 'F8M 730'. Visually, it is identifiable by its cast iron block, aluminium cylinder head, and prominent Bosch mechanical fuel pump mounted on the side. It lacks a turbocharger and features a simple air filter housing. Differentiate from the similar F8M 732 by power output and specific model application; the 732 is slightly more powerful.
The F8M 730's primary reliability risk is cylinder head cracking, often triggered by coolant system neglect. While mechanically simple and generally robust, overheating events are a critical failure point. Maintaining the cooling system and addressing leaks immediately is paramount to prevent costly engine damage.
Analysis derived from Renault technical bulletins (1985-1996) and owner club maintenance records. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about RENAULT F8M-730.
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EUR-Lex
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DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
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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
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VCA Certification Portal
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