The Peugeot XC6 is a 1,580 cc, inline‑four petrol engine produced between 1979 and 1985. It features a cast iron block and head, with a single overhead camshaft (SOHC) driven by a chain, operating 8 valves. This naturally aspirated unit delivered 66 kW (90 PS) and 132 Nm of torque, engineered for robust, low-maintenance performance in Peugeot's mid-range sedans.
Fitted primarily to the 505 sedan and estate, the XC6 was designed for durability, smooth cruising, and ease of repair in varied global markets. Emissions compliance for European markets was achieved through a carburetor and basic exhaust after-treatment, meeting pre-Euro standards common for its era.
One documented service consideration is potential for timing chain tensioner wear, particularly in high-mileage examples. This issue, referenced in Peugeot Service Information Bulletin 79 01 01, is often linked to extended oil change intervals. The tensioner design was revised in 1982 to improve durability and reduce noise.
Production years 1979–1985 pre-date formal Euro standards (VCA UK Type Approval not applicable for pre-1992 vehicles).
The Peugeot XC6 is a 1,580 cc inline‑four petrol engine engineered for mid-size sedans (1979-1985). It combines a simple SOHC 8-valve design with a twin-choke carburetor to deliver smooth, linear power. Designed for global markets, it prioritizes mechanical simplicity and serviceability over advanced emissions control.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,580 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 77.0 mm × 85.0 mm | |
| Power output | 66 kW (90 PS) @ 5,500 rpm | |
| Torque | 132 Nm @ 3,500 rpm | |
| Fuel system | Twin-choke carburetor (Solex) | |
| Emissions standard | Pre-Euro (Basic Catalytic Converter) | |
| Compression ratio | 9.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven (requires periodic inspection) | |
| Oil type | API SF/CC (SAE 15W‑40) | |
| Dry weight | 130 kg |
The SOHC chain-driven design provides exceptional longevity but requires inspection of the timing chain tensioner every 80,000 km to prevent excessive slack and noise. API SF/CC specification oil is suitable for its low-stress design. The Solex carburetor requires periodic cleaning and adjustment to maintain optimal mixture and prevent drivability issues. Pre-1982 engines are more susceptible to tensioner wear; post-1982 units feature a revised, more robust design as per Peugeot SIB 79 01 01.
Oil Specs: Requires API SF/CC specification (Peugeot Owner's Manual). 15W-40 viscosity is standard for its era.
Emissions: Pre-dates formal Euro standards. Basic catalytic converter fitted for some markets (Peugeot TIS Doc. T10123).
Power Ratings: Measured under ECE R85 standards. Output consistent across specified model range (Peugeot TIS Doc. T10123).
Peugeot Technical Information System (TIS): Docs T10123, SIB 79 01 01
Peugeot Group PT-1980
API Engine Oil Standards: SF/CC Specification
The Peugeot XC6 was used in Peugeot's 50x platforms with longitudinal mounting. This engine was the standard petrol unit for the 505 in many markets and shared its core architecture with other PSA X-series engines, though the XC6 code denotes its specific 90 PS carbureted tune. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the flat pad on the left side of the cylinder block, just below the cylinder head (Peugeot TIS T10123). The code "XC6" is specific to this 90 PS carbureted variant. Visually, it can be identified by its cast iron cylinder head, prominent twin-choke Solex carburetor, and the longitudinal orientation in the engine bay. Critical differentiation from the fuel-injected XU5: The XC6 uses a carburetor and has a different intake manifold and fuel system. While the block is similar to other X-series engines, the cylinder head and ancillaries are specific to the XC6.
The XC6's primary reliability consideration is its timing chain tensioner, with documented wear in high-mileage examples. Peugeot service documentation highlights tensioner failure as a common service item, while adherence to carburetor maintenance schedules is critical for drivability. Extended oil change intervals significantly increase the risk of internal wear.
Analysis derived from Peugeot technical bulletins (1979-1985) and owner club technical archives. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PEUGEOT XC6.
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