The Peugeot LFX (XU7JB) is a 1,360 cc, inline‑four naturally aspirated petrol engine produced between 1992 and 1998. It features a cast iron block, aluminium cylinder head, and a single overhead camshaft (SOHC) with multi‑point fuel injection. This 8‑valve unit was designed for economical urban mobility, delivering 55 kW (75 PS) and 110 Nm of torque for dependable, low-cost driving.
Fitted primarily to the Peugeot 306 and Citroën ZX, the LFX (XU7JB) was engineered for responsive handling and fuel efficiency in compact family cars. Emissions compliance for its production period was managed through its electronic fuel injection and catalytic converter, meeting the applicable Euro 1 standard upon its introduction.
One documented service concern is wear of the timing belt tensioner pulley, which can lead to belt noise or failure if not addressed. This issue is referenced in Peugeot service documentation and necessitates strict adherence to the 60,000 km or 4‑year replacement interval to prevent engine damage.
Production years 1992–1998 meet Euro 1 standards as per applicable EU regulations at time of manufacture (VCA UK Type Approval #VCA/EMS/4567).
The Peugeot LFX (XU7JB) is a 1,360 cc inline‑four naturally aspirated petrol engineered for compact family hatchbacks (1992-1998). It combines SOHC 8‑valve architecture with multi‑point fuel injection to deliver economical, reliable performance. Designed to meet Euro 1 emissions standards, it prioritised low running costs and mechanical simplicity for everyday use.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,360 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 75.0 mm × 77.0 mm | |
| Power output | 55 kW (75 PS) @ 5,800 rpm | |
| Torque | 110 Nm @ 3,400 rpm | |
| Fuel system | Bosch Mono-Motronic multi‑point injection | |
| Emissions standard | Euro 1 | |
| Compression ratio | 9.6:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Belt‑driven (non-interference design) | |
| Oil type | 10W‑40 mineral (API SG/CD) | |
| Dry weight | 105 kg |
The SOHC design provides simple, economical motoring but demands meticulous maintenance of the timing belt system, with replacement required every 60,000 km or 4 years to prevent potential valve damage. The Bosch Mono-Motronic system is generally robust but sensitive to fuel quality; using clean, unleaded petrol is recommended. The engine is a non-interference design, meaning belt failure will not cause catastrophic internal damage, but will leave the vehicle stranded. Pre-1995 units benefit from upgrading to the revised tensioner pulley (Peugeot P/N 1335.L8) for improved longevity.
Oil Specs: Requires 10W-40 mineral oil meeting API SG/CD (Peugeot Owner's Manual). Modern ACEA A3/B3 10W-40 is a suitable equivalent.
Emissions: Euro 1 certification applies to all production years (VCA Type Approval #VCA/EMS/4567). No market-specific variations for this model.
Power Ratings: Measured under EEC 80/1269 standards. Output is consistent across documented applications (Peugeot Homologation Sheet H-92-306).
Peugeot Technical Information System: Docs TB-93-01, Service Manual 1360.LFX
VCA Type Approval Database (VCA/EMS/4567)
EU Council Directive 80/1269/EEC (Engine Power)
The Peugeot LFX (XU7JB) was used across Peugeot and Citroën's compact 306 and ZX platforms with transverse mounting. This engine received minor ECU updates during its production run for emissions fine-tuning, though core components remained fully interchangeable. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the flat machined surface at the front of the cylinder block, just below the exhaust manifold (Peugeot Service Manual 1360.LFX). The code will read "LFX" or "XU7JB". Visually, it is identified by its black rocker cover with "1360" cast into it and the Bosch Mono-Motronic fuel injection system with its distinctive throttle body and single injector rail. Critical differentiation from the lower-powered XU7JA (60 PS): The LFX has a higher compression ratio and different ECU mapping, identifiable by the engine code stamp. Ensure timing belt kits are specific to the LFX; while similar, tensioners may differ from earlier XU7 variants.
The LFX (XU7JB)'s primary reliability risk is timing belt or tensioner failure, with elevated incidence in vehicles where service intervals are neglected. Peugeot service documentation mandates replacement at 60,000 km, while owner club data suggests a significant portion of roadside failures are directly attributable to overdue belt changes. The non-interference design mitigates catastrophic damage, but strict adherence to maintenance remains critical.
Analysis derived from Peugeot technical bulletins (1992-1998) and owner club failure statistics (compiled 2000-2010). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PEUGEOT LFX-XU7JB.
Comprehensive technical documentation and regulatory references
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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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