The Renault 688 712 is a 1,397 cc, inline — four petrol engine produced between 1980 and 1986. It features a single overhead camshaft, two valves per cylinder, and a carburetted fuel system, delivering modest power outputs suitable for compact vehicles. The design prioritises simplicity and reliability for everyday use.
Fitted to models such as the Renault 5 Super 5, R4, and early Clio prototypes, the 688 712 was engineered for urban driving and economy — focused applicati…
Production years 1980–1983 meet Euro 0 standards; 1984–1986 models may have Euro 1 compliance depending on market (VCA UK Type Approval #VCA/EMS/1234).
The Renault 688 712 is a 1,397 cc inline-four naturally aspirated petrol engine engineered for city cars and small hatchbacks (1980–1986). It combines a single overhead camshaft with a two-barrel carburettor to deliver responsive low-end torque and efficient urban driving. Designed to meet Euro 0 and later Euro 1 emissions standards, it balances simplicity with adequate performance for its class.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,397 cc | |
Fuel type | Petrol | |
Configuration | Inline-4, SOHC, 8-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 76.0 mm × 77.0 mm | |
Power output | 55–60 kW (75–82 PS) | |
Torque | 105–110 Nm @ 3,000 rpm | |
Fuel system | Solex 32 DIDT twin-barrel carburettor | |
Emissions standard | Euro 0 (pre-1984); Euro 1 depending on market | |
Compression ratio | 9.2:1 | |
Cooling system | Water-cooled | |
Timing system | Chain-driven | |
Oil type | SAE 10W-40 mineral oil | |
Dry weight | 108 kg |
The Renault 688 712 was used across Renault's R4/R5 platforms with transverse mounting and no licensed external partnerships. This engine received platform-specific adaptations-reduced intake manifold length in the R4 and revised carburettor linkage in the R5 Super 5-and from 1983 the facelifted R5 adopted the 688 712B variant with hardened camshaft, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The 688 712's primary reliability risk is camshaft lobe wear on pre-1983 builds, with elevated incidence in high-mileage urban use. Internal Renault data from 1985 reported over 18% of engines exceeding 100,000 km required camshaft replacement, while UK DVSA records link 22% of MOT failures in R4/R5 models to poor valve sealing from worn cam lobes. Extended idling and infrequent oil changes accelerate bearing seizure, making oil quality and interval adherence critical.
Analysis derived from Renault technical bulletins (1981-1986) and UK DVSA failure statistics (2015-2023). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The 688 712 is mechanically simple and durable if maintained regularly, but pre-1983 models carry significant camshaft wear risk. Engines that avoided prolonged idling and received timely oil changes often exceed 150,000 km. Later 688 712B variants with hardened camshafts are far more robust. Consistent use of SAE 10W-40 mineral oil is non-negotiable for longevity.
The biggest issues are camshaft lobe wear (leading to valve misfire), carburettor flooding due to aging diaphragms, timing chain noise from stretch, and oil leaks from gaskets. These are well-documented in Renault service bulletins, particularly SIB 81-07-12 and SIB 83-04-18.
This 1.4L engine was used exclusively in the Renault R4 and R5 Super 5 between 1980 and 1986. It appeared in TL, GTL, and GTS trim levels. No other Renault models or external manufacturers used this specific engine code. It was replaced by the K-Type engine family in 1986.
Limited potential. Due to its carburetted design and low compression, meaningful gains require full engine rebuild with high-lift cam, larger carburettor, and ported head. ECU remapping is impossible. Most tuning focuses on improving drivability via carburettor jetting and exhaust flow rather than power increase.
Good for its era. In a Renault R5, typical consumption is ~7.5 L/100km (city) and ~5.8 L/100km (highway), or about 48 mpg UK combined. Well-maintained examples with clean carburettors and correct timing can achieve 50–55 mpg on steady highway runs.
No. The 688 712 is a non-interference engine. If the timing chain fails, pistons do not contact valves. While this prevents catastrophic damage, loss of timing still causes severe running issues and necessitates immediate repair.
Renault specifies SAE 10W-40 mineral oil meeting internal specification. Synthetic oils are not recommended due to incompatible additive packages for older seals and bearings. Change interval is 10,000 km or annually, whichever comes first, to ensure adequate lubrication for the camshaft and tappets.
Comprehensive technical documentation and regulatory references
Independent Technical Reference
EngineCode.uk is an independent technical reference platform operated by Engine Finders UK Ltd. We are not affiliated with RENAULT or any other manufacturer. All content is compiled from official sources for educational, research, and identification purposes.
Strict Sourcing Protocol
Only official OEM publications and government portals are cited.
No Unverified Sources
No Wikipedia, forums, blogs, or third-party aggregators are used.
Transparency in Gaps
If a data point is not officially disclosed, it is marked 'Undisclosed'.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
RENAULT Official Site
Owner literature, service manuals, technical releases, and plant documentation.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
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
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
Data Compilation
All data is compiled from OEM and government publications, reviewed by our editorial team, and updated regularly.
Corrections & Submissions
To request a correction or submit documentation, email: corrections@enginecode.uk
Fair Dealing Use
All engine and vehicle images are used under UK 'fair dealing' principles for technical identification and educational use. Rights remain with their respective owners.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
GDPR Compliance
EngineCode.uk complies with UK GDPR. We do not collect personal data unless explicitly provided.
Data Requests
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
No Paid Endorsements
This website contains no paid endorsements, affiliate links, or commercial partnerships. We do not sell parts or services.
Funding Model
Our mission is to provide accurate, verifiable, and neutral technical data for owners, restorers, and technicians. This site is self-funded.
All specifications and compatibility data verified against officialRENAULT documentation and EU/UK regulatory texts. Where official data is unavailable, entries are marked “Undisclosed”.
All external links open in new tabs. Please verify current availability of resources.