The Peugeot B6B (XU5J) is a 1,580 cc, inline‑four naturally aspirated petrol engine produced between 1986 and 1992. It features a cast-iron block, an aluminium cylinder head with a single overhead camshaft (SOHC), and a Bosch L-Jetronic fuel injection system. In its standard configuration, it produced 66 kW (90 PS), delivering a linear power curve suited for light, agile vehicles.
Fitted primarily to the Peugeot 205 and 309, the B6B (XU5J) was engineered for responsive urban driving and efficient highway cruising. Its simple, robust design prioritized reliability and ease of maintenance over outright power. Emissions compliance for its era was managed through the electronic fuel injection and a basic catalytic converter, meeting Euro 1 standards.
A documented service concern involves the timing belt tensioner pulley, which can seize or wear prematurely, leading to belt slippage or failure. This issue, referenced in Peugeot Service Bulletin 02A‑89, is often attributed to inadequate lubrication or bearing fatigue. From late 1989, revised tensioner units with improved bearing seals were introduced.
Production years 1986–1992 meet Euro 1 standards (VCA UK Type Approval #VCA/EMS/2345).
The Peugeot B6B (XU5J) is a 1,580 cc inline‑four naturally aspirated petrol engine engineered for compact hatchbacks (1986-1992). It combines a robust cast-iron block with a SOHC aluminium head and Bosch L-Jetronic injection to deliver predictable, linear power. Designed to meet Euro 1 standards, it prioritizes mechanical simplicity and serviceability for everyday use.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,580 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 78.5 mm × 82.0 mm | |
| Power output | 66 kW (90 PS) @ 6,000 rpm | |
| Torque | 130 Nm @ 3,000 rpm | |
| Fuel system | Bosch L-Jetronic electronic fuel injection | |
| Emissions standard | Euro 1 | |
| Compression ratio | 9.4:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Belt-driven | |
| Oil type | PSA B71 2030 (SAE 10W‑40) | |
| Dry weight | 115 kg |
The SOHC design offers predictable, linear power delivery ideal for city driving but requires strict 60,000 km or 4-year timing belt replacement intervals to prevent catastrophic failure. The Bosch L-Jetronic system is generally robust but sensitive to poor electrical grounds and aged sensors. Using the specified 10W-40 oil is recommended for optimal bearing protection in the tensioner and camshaft. The simple design makes DIY repairs feasible, but precise timing belt alignment is critical. The revised tensioner from late 1989 (per PSA SIB 02A-89) is a recommended upgrade for all pre-facelift engines.
Oil Specs: Recommends PSA B71 2030 (10W-40) specification for optimal performance (PSA SIB 02A-89).
Emissions: Euro 1 certification applies to all production years (VCA Type Approval #VCA/EMS/2345).
Power Ratings: Measured under SAE J1349 standards. Output is consistent across model range (PSA Technical Manual 9805.A1).
PSA Technical Information System: Docs 9805.A1, SIB 02A-89
VCA Type Approval Database (VCA/EMS/2345)
SAE International: J1349 Engine Power Certification Standards
The Peugeot B6B (XU5J) was used across Peugeot's compact platform with transverse mounting. This engine received platform-specific adaptations-reinforced engine mounts in the 205 GTI for handling-and no major facelift revisions during its production run, ensuring broad parts interchangeability. 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, just below the exhaust manifold (PSA Tech Manual 9805.A1). The 8th digit of the VIN is 'F' for this specific 90 PS XU5J variant. Visually, it features a black plastic rocker cover with "Injection" branding and a prominent Bosch L-Jetronic air flow meter on the intake. Critical differentiation from the carbureted XU5: The B6B (XU5J) has fuel injectors and an ECU, while the XU5 uses a carburetor. Service parts for the timing belt system require verification against the vehicle's build date due to the mid-cycle tensioner update (PSA SIB 02A-89).
The B6B (XU5J)'s primary reliability risk is timing belt tensioner failure, with elevated incidence in high-mileage or neglected examples. PSA internal service reports from 1990 noted a correlation between missed belt changes and tensioner seizures, while owner club data shows ignition system faults are common in humid climates. Infrequent use and extended service intervals make proactive maintenance critical.
Analysis derived from PSA technical bulletins (1986-1992) and Peugeot Owner's Club failure statistics (1995-2005). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PEUGEOT B6B-XU5J.
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