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R5 Alpine NA camshaft – 7700620969 – 840-725
425.00 €
In stock
You are restoring a naturally aspirated Renault 5 Alpine and looking for a camshaft true to the original, with no competition profile that changes the engine’s behaviour? That is exactly what we have remanufactured for the 840-725 / C6J engine.
After 18 months of study, Mespiecesauto has reproduced this camshaft identically : same material, chilled cast iron, same original timing diagram 30°/72° – 72°/30°, same lift and same through-hardening heat-treatment logic on the cam lobes.
This is not an approximation or an “adaptable” camshaft with an unknown profile, but a remanufactured part technically consistent with the original Renault specification
, designed to preserve the engine behaviour of the R5 Alpine.
A camshaft true to the original Renault profile
This naturally aspirated R5 Alpine camshaft is intended for the 840-725 / C6J engine fitted to the Renault 5 Alpine, type R1223.
It matches the original reference 7700620969.
The valve timing diagram uses the original Renault values:
30°/72° – 72°/30°, measured at 0.19 mm lift, according to the Renault standard.
The opening duration is 282° at 19/100 mm, with a lift of 6.4 mm. These values keep the engine behaviour
originally intended for the naturally aspirated Renault 5 Alpine.
Made of chilled cast iron
Like the original part, this camshaft is made of chilled cast iron. This process gives localised hardness on the cam working surfaces, while keeping a structure suited to the mechanical stresses of the valvetrain.
The cam lobes also receive a through-hardening heat treatment, to ensure good wear resistance and long-term profile stability.
Identical Mespiecesauto remanufacturing
The remanufacturing of this R5 Alpine camshaft was not limited to a simple visual copy. The aim was to reproduce a part technically consistent with the
original specification: material, geometry, timing diagram, lift and treatment.
This approach makes it possible to offer a camshaft suited to a serious engine restoration, without changing the character of the naturally aspirated Renault 5 Alpine.
Technical specifications
| Product | Naturally aspirated R5 Alpine camshaft |
|---|---|
| Original reference | 7700620969 |
| Compatible model | Renault 5 Alpine / R5 Alpine |
| Compatible engine | 840-725 / C6J / Cléon |
| Vehicle type | R1223 |
| Timing diagram | 30°/72° – 72°/30° |
| Opening duration | 282° at 0.19 mm lift |
| Lift | 6.4 mm |
| Material | Chilled cast iron |
| Treatment | Through-hardening heat treatment of the cam lobes |
Technical specifications
Many questions remain about Renault 5 camshafts, particularly those of the Cléon 1397 engine.
From our technical archives and metallurgical studies, we fully recreated the original foundry tooling. The process used scrupulously follows the heat treatment built into the casting, unlike secondary surface treatments (such as nitriding), which do not guarantee the same reliability.
The lobes of these side camshafts are made of two distinct materials (see our electron microscope photos) : the surface and the core of the lobes have different hardnesses, as in the original. This manufacturing complexity is essential to ensure compatibility with the tappets and maintain a good friction coefficient.
The camshaft is supplied without a drive gear : contrary to a persistent belief, it was never factory-matched. Only the original cast-iron gear, phosphate-treated, is compatible. Any machined remanufacturing attempt leads to failures (breakages, abnormal noises, premature wear).
The camshaft, the gear and the tappet form a coherent mechanical assembly
Shown in the illustrations:
- The cross-section of a lobe under the scanning electron microscope, showing the two distinct metallurgical zones
- The raw castings, proving there is no machining from billet
- The sand imprints specific to our tooling
How to choose your R5 Alpine camshaft
💡 Technical tip
When rebuilding a naturally aspirated Renault 5 Alpineengine, a full metrology check is strongly recommended.
You can download our metrology sheet dedicated to the R5 Alpine, designed to guide you step by step.
Particular attention must be paid to the clearance between the camshaft and the block : many Cléon engines suffer from oil pressure loss due to the lack of checking at this point.
We strongly recommend replacing the camshaft bush on reassembly, to ensure optimal operation and avoid any premature wear.
