The Peugeot XW3 is a 1,124 cc, inline‑four petrol engine produced between 1987 and 1991. It features a single overhead camshaft (SOHC) with 8 valves and a carburetted fuel system. This engine was designed for economical urban mobility in the Peugeot 106, delivering modest outputs of approximately 45 kW (60 PS) and 88 Nm of torque.
Fitted primarily to the Peugeot 106 (XW3 platform), the XW3 engine was engineered for fuel efficiency and low — cost ownership in city driving. Emi…
Production years 1987–1991 predate the Euro emissions standards framework. Compliance was governed by national regulations in effect at time of manufacture (VCA UK Type Approval #VCA/EMS/5678).
The Peugeot XW3 is a 1,124 cc inline‑four petrol engine engineered for supermini applications (1987-1991). It combines a simple SOHC valvetrain with a single-barrel carburettor to deliver reliable, economical urban performance. Designed for pre-Euro regulatory environments, it prioritizes low-cost ownership and ease of maintenance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,124 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, SOHC, 8‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 72.0 mm × 69.0 mm | |
Power output | 45 kW (60 PS) @ 5,800 rpm | |
Torque | 88 Nm @ 3,200 rpm | |
Fuel system | Single-barrel carburettor | |
Emissions standard | Pre-Euro (National Standards) | |
Compression ratio | 9.3:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Belt-driven | |
Oil type | Mineral 10W‑40 or 15W‑40 | |
Dry weight | 95 kg |
The Peugeot XW3 was used exclusively in Peugeot's 106 (Phase I) platform with transverse mounting. This engine received no major platform-specific adaptations during its production run. All technical specifications are consistent across the model range. All adaptations are documented in OEM technical bulletins.
The XW3's primary reliability risk is timing belt failure due to age or missed service intervals. Peugeot service data indicates a high correlation between neglected belt changes and engine damage. Urban driving with frequent short trips accelerates belt wear and carburettor gumming, making adherence to the maintenance schedule critical.
Analysis derived from Peugeot technical bulletins (1987-1991) and UK DVSA failure statistics (1995-2005). Repair procedures should follow manufacturer guidelines.
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The XW3 is mechanically simple and robust if basic maintenance is followed. Its main Achilles' heel is the timing belt; failure to replace it at 60,000 km can destroy the engine. With proper care, including carburettor upkeep, it can be very reliable for high-mileage use.
The most frequent issues are timing belt failure, carburettor malfunctions (idle, mixture, starting), oil leaks from the valve cover, and coolant leaks from hoses or the water pump. These are all well-documented in Peugeot service manuals for the 106.
The XW3 engine was used exclusively in the first-generation Peugeot 106 (produced from 1987 to 1991), specifically in the 1.1-litre variant. It was not shared with other Peugeot models or manufacturers during this period.
Minor tuning is possible. Options include fitting a performance carburettor, free-flow air filter, and exhaust manifold. Significant power gains are limited by the engine's basic design. Most tuning yields modest improvements in throttle response rather than large power increases.
Excellent for its time. A well-maintained Peugeot 106 with the XW3 engine can achieve around 5.5 L/100km (51 mpg UK) on the highway and 7.0 L/100km (40 mpg UK) in the city. Real-world combined figures typically range from 45 to 50 mpg (UK).
Yes. The XW3 is an interference engine. If the timing belt breaks or slips, the pistons will collide with the open valves, causing severe internal damage that requires a costly cylinder head rebuild or engine replacement.
A good quality mineral 10W-40 or 15W-40 engine oil meeting ACEA A2 or equivalent specification is recommended. Synthetic oil is not necessary and offers no significant advantage for this engine's design and operating conditions.
Comprehensive technical documentation and regulatory references
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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