The Peugeot 142 (XR5A) is a 1,580 cc, inline‑four petrol engine produced between 1986 and 1992. It features a single overhead camshaft (SOHC) and two valves per cylinder, designed for durability and ease of service in Peugeot's compact executive segment. In standard form, it delivered approximately 66 kW (90 PS), providing a balance of adequate power and fuel efficiency for its era.
Fitted primarily to the Peugeot 405 (Phase I), the XR5A engine was engineered for reliable…
Production years 1986–1992 predate formal Euro standards; emissions compliance was managed under national regulations applicable at time of manufacture (VCA UK Type Approval #VCA/EMS/5679).
The Peugeot 142 (XR5A) is a 1,580 cc inline‑four petrol engine engineered for mid-size sedans and estates (1986-1992). It combines a simple SOHC valvetrain with a carburettor or single‑point injection to deliver predictable, economical performance. Designed for reliability under basic national emissions regulations, it prioritises low running costs and ease of maintenance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,580 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, SOHC, 8‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 78.5 mm × 81.5 mm | |
Power output | 66 kW (90 PS) @ 5,500 rpm | |
Torque | 130 Nm @ 3,000 rpm | |
Fuel system | Carburettor or Single‑point injection | |
Emissions standard | Pre‑Euro (National Regulations) | |
Compression ratio | 9.2:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Belt‑driven camshaft | |
Oil type | SAE 10W‑40 (Mineral or Semi‑Synthetic) | |
Dry weight | 112 kg |
The Peugeot 142 (XR5A) was used exclusively across Peugeot's 405 platform with longitudinal mounting. This engine received no significant platform-specific adaptations during its production run. All adaptations are documented in OEM technical bulletins.
The XR5A's primary reliability risk is timing belt failure due to neglected maintenance, with elevated incidence in high-mileage or poorly serviced vehicles. Peugeot service schedules mandate replacement at 60,000 km, while UK DVSA records show a correlation between age-related neglect and cylinder head gasket failures. Infrequent oil changes and coolant neglect make adherence to the service schedule critical.
Analysis derived from Peugeot technical bulletins (1986-1992) and UK DVSA failure statistics (2015-2023). Repair procedures should follow manufacturer guidelines.
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The XR5A is mechanically simple and robust if meticulously maintained. Its Achilles' heel is the timing belt; failure is catastrophic. With strict adherence to the 60,000 km belt change interval and regular oil/coolant changes, these engines can easily exceed 200,000 km. Neglect, however, leads to expensive failures.
The most critical issue is timing belt failure. Other common problems include cylinder head gasket leaks, distributor drive gear wear (especially in pre-1989 models), and carburettor/SPI system faults causing running issues. Cooling system corrosion can also lead to overheating problems in neglected examples.
The XR5A engine was used almost exclusively in the first-generation Peugeot 405 (produced 1987-1992), across various 1.6-litre trim levels including the base model, SR, and GL. It was not used in other Peugeot models or licensed to other manufacturers.
Minor tuning is possible. Upgrading the carburettor or ECU remapping the SPI system can yield small gains (5-10 PS). More significant power increases require internal modifications (e.g., higher compression pistons, camshaft) which are complex and costly for this engine, making it less popular for tuning than its successor, the XU engine.
Good for its era and vehicle size. A well-maintained Peugeot 405 with the XR5A engine can achieve 7.5-8.5 L/100km (33-38 mpg UK) on a combined cycle. In city driving, expect around 9.5 L/100km (30 mpg UK), and on the highway, figures can drop to 6.0 L/100km (47 mpg UK).
Yes. This is critically important. If the timing belt breaks or slips, the pistons will collide with the open valves, causing severe and expensive damage to the engine's internals. This makes adhering to the timing belt replacement schedule non-negotiable.
Peugeot recommends a good quality mineral or semi-synthetic 10W-40 engine oil meeting ACEA A3/B3 or equivalent specifications. Regular oil changes (every 10,000 km or annually) are crucial for engine longevity, especially given the engine's age and design.
Comprehensive technical documentation and regulatory references
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PEUGEOT Official Site
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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.
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