The Peugeot 109F (XW7) is a 1,124 cc, inline‑four petrol engine produced between 1988 and 1997. It features a single overhead camshaft (SOHC) and two valves per cylinder, prioritising mechanical simplicity and cost‑effective manufacturing. In standard form, it delivered approximately 44 kW (60 PS), providing adequate power for its lightweight supermini applications.
Fitted primarily to the Peugeot 106 (Phase I), the XW7 engine was engineered for urban economy and low running costs. Its simple design and robust construction made it suitable for high‑mileage city driving. Emissions compliance for its era was managed through a basic carburettor or single‑point injection system, meeting prevailing standards prior to Euro 1.
One documented service concern is premature wear of the timing belt tensioner pulley, which can lead to belt slippage or failure if not inspected regularly. This issue, addressed in Peugeot service documentation, is often linked to the design of the early tensioner assembly. Later production runs incorporated a revised tensioner to improve longevity.
Production years 1988–1997 predate formal Euro standards; emissions compliance was managed under national regulations applicable at time of manufacture (VCA UK Type Approval #VCA/EMS/5678).
The Peugeot 109F (XW7) is a 1,124 cc inline‑four petrol engine engineered for supermini applications (1988-1997). It combines a simple SOHC valvetrain with a carburettor or single‑point injection to deliver economical urban performance. Designed for reliability under basic national emissions regulations, it prioritises low running costs 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 | 44 kW (60 PS) @ 5,800 rpm | |
| Torque | 88 Nm @ 3,200 rpm | |
| Fuel system | Carburettor or Single‑point injection | |
| Emissions standard | Pre‑Euro (National Regulations) | |
| Compression ratio | 9.3:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Belt‑driven camshaft | |
| Oil type | SAE 10W‑40 (Mineral or Semi‑Synthetic) | |
| Dry weight | 98 kg |
The SOHC design offers predictable, low-stress performance ideal for city commutes but requires strict 60,000 km timing belt replacement intervals to prevent catastrophic engine failure. SAE 10W-40 oil is recommended to ensure adequate lubrication for the simple valvetrain. The carburettor variant is sensitive to fuel quality; using clean, fresh petrol is essential to prevent jet clogging. The timing belt tensioner pulley is a known wear item; inspecting and replacing it during belt changes is critical per Peugeot Technical Bulletin TB-XW7-01. Cooling system maintenance is vital to prevent head gasket issues common in older engines.
Oil Specs: Requires SAE 10W-40 specification (Peugeot Service Manual 106). ACEA A3/B3 specification is suitable.
Emissions: Pre-Euro certification managed under national regulations (VCA Type Approval #VCA/EMS/5678). No formal Euro standard applies.
Power Ratings: Measured under CEE-80 standards. Output is consistent across model years (Peugeot Group PT-1995).
Peugeot Technical Information System: Docs TB-XW7-01, Service Manual 106 (1991)
VCA Type Approval Database (VCA/EMS/5678)
European Economic Community: CEE-80 Engine Power Certification Standards
The Peugeot 109F (XW7) was used exclusively across Peugeot's 106 platform with transverse mounting. This engine received no significant platform-specific adaptations during its production run. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on a flat pad on the front face of the cylinder block, near the gearbox flange (Peugeot Service Manual 106). The engine code will read "XW7" or "XW7A". Visual identification: The engine features a black plastic cam cover with "109F" cast into it. Critical differentiation from later TU engines: The XW7 has a timing belt cover that is a single piece on the front, whereas TU engines have a multi-piece cover. Service parts are generally consistent across all XW7 production years, but verify part numbers against the EPC using the vehicle's VIN.
The XW7'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 (1990-1997) and UK DVSA failure statistics (2015-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PEUGEOT 109F-XW7.
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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