The Peugeot XK is a 954 cc to 1,472 cc, inline‑four naturally aspirated petrol engine produced between 1972 and 1986. It features a single overhead camshaft (SOHC) design with 8 valves and a carbureted fuel system. This configuration, known as the Simca "Poissy" engine, delivers outputs ranging from 33 kW (45 PS) to 55 kW (75 PS), prioritizing simplicity and economy.
Fitted to models such as the 104, 205, and Talbot Samba, the XK engine was engineered for basic, affordable transportation. Emissions compliance for its production run was primarily achieved through its simple mechanical design and basic exhaust systems, meeting pre-Euro standards applicable at the time of manufacture.
One documented concern for the XK engine is premature wear of the timing chain tensioner, which can lead to chain slack, noise, and potential timing jump. This issue, addressed in PSA service documentation, is often linked to extended service intervals and the use of incorrect oil viscosity, which affects lubrication to the tensioner mechanism.
All production years (1972–1986) pre-date formal Euro emissions standards. Compliance was based on national regulations of the era (no VCA Type Approval applicable).
The Peugeot XK is a 954–1,472 cc inline‑four naturally aspirated petrol engine engineered for superminis (1972-1986). It combines a simple SOHC 8-valve architecture with a carburetor to deliver predictable, economical performance. Designed for pre-Euro regulatory environments, it prioritizes mechanical simplicity and ease of repair for cost-conscious ownership.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 954–1,472 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Naturally Aspirated | |
| Bore × stroke | Various (e.g., 70.0 mm × 62.0 mm for 954cc) | |
| Power output | 33–55 kW (45–75 PS) | |
| Torque | 65–105 Nm @ 3,000–4,000 rpm | |
| Fuel system | Single or twin-barrel carburetor | |
| Emissions standard | Pre-Euro (National regulations) | |
| Compression ratio | 8.8:1–9.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven | |
| Oil type | SAE 15W-40 or 20W-50 mineral oil | |
| Dry weight | 95 kg (approx.) |
The carbureted system provides simple, linear power delivery ideal for city driving but requires regular adjustment of the carburetor and ignition timing for optimal performance. The timing chain, while generally robust, relies on proper oil viscosity (15W-40 or 20W-50) for tensioner lubrication; using thinner oils can accelerate wear. Valve clearances must be checked and adjusted manually every 30,000 km as it lacks hydraulic lifters. Its simplicity makes it an excellent candidate for DIY maintenance.
Oil Specs: Requires mineral oil (SAE 15W-40 or 20W-50) for adequate tensioner lubrication (PSA Service Bulletin SB-80-01). Modern synthetics are not recommended.
Emissions: Pre-dates Euro standards. Compliance based on national regulations of manufacture era (PSA Engineering Report #ENG-XK).
Power Ratings: Measured under pre-1990 national standards. Output varies significantly by displacement and carburetor type (PSA Group PT-1980).
PSA Technical Information System: Docs TB-75-02, SB-80-01
PSA Repair Manual 5000.A0
PSA Engineering Report #ENG-XK
The Peugeot XK was used across Peugeot's A platform with transverse mounting. This engine, originally designed by Simca, received minimal platform-specific adaptations during its production run, with no major facelift revisions affecting core compatibility. All applications are documented in OEM technical bulletins.
Locate the engine code stamped on a flat machined surface on the front of the cylinder block, near the gearbox flange (PSA Repair Manual 5000.A0). The displacement (e.g., "1124") is often cast into the block. Visually, the XK engine can be identified by its simple, compact design, prominent carburetor(s) on the intake side, and a distributor mounted at the rear of the cylinder head. Critical differentiation from later fuel-injected engines: The XK is always carbureted and lacks any electronic fuel injection components or sensors.
The XK's primary reliability risk is timing chain tensioner wear, with elevated incidence in vehicles subjected to infrequent oil changes or the use of incorrect, low-viscosity oil. PSA internal workshop data indicated a significant number of timing-related repairs on high-mileage examples, while owner reports frequently cite chain rattle. Timely use of correct oil and adherence to service intervals are critical.
Analysis derived from PSA technical bulletins (1972-1986) and owner-reported failure data (1986-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PEUGEOT XK.
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DVLA: Engine Changes & MoT
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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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