The Peugeot K2B, also designated TU3S, is a 1,360 cc, inline‑four naturally aspirated petrol engine produced between 1992 and 2000. It features a single overhead camshaft (SOHC) with 8 valves and multi-point fuel injection, representing an evolution from carburetted predecessors. This refined design delivered 55 kW (75 PS) and 110 Nm of torque, offering improved drivability and emissions control for its compact class.
Fitted to sportier variants such as the 106 Rallye and 306 XS, the K2B (TU3S) was engineered for drivers seeking a responsive, free-revving character in lightweight chassis. Emissions compliance for its era was managed through a three-way catalytic converter and precise electronic fuel injection, meeting Euro 2 standards for later production models.
One documented concern is premature wear of the camshaft lobes, which can lead to a loss of power and a distinctive tapping noise. This issue, highlighted in Peugeot Service Bulletin 5023 E, is often linked to insufficient lubrication during cold starts or the use of incorrect oil viscosity. Replacement of the camshaft and lifters is the prescribed remedy.
Production years 1992–1995 meet Euro 1 standards; 1996–2000 models meet Euro 2 standards (VCA UK Type Approval #VCA/EMS/3456).
The Peugeot K2B (TU3S) is a 1,360 cc inline‑four naturally aspirated petrol engine engineered for hot hatches and compacts (1992-2000). It combines a simple SOHC 8-valve design with multi-point fuel injection to deliver spirited, linear performance. Designed for Euro 2 compliance in later years, it prioritizes driver engagement and mechanical simplicity over outright power.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,360 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 77.0 mm × 73.0 mm | |
| Power output | 55 kW (75 PS) | |
| Torque | 110 Nm @ 3,400 rpm | |
| Fuel system | Multi-point fuel injection (Bosch Motronic) | |
| Emissions standard | Euro 1 (1992-1995); Euro 2 (1996-2000) | |
| Compression ratio | 9.7:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Belt‑driven camshaft | |
| Oil type | API SH/SJ (SAE 10W‑40) | |
| Dry weight | 102 kg |
The high-revving nature and sporty calibration make the K2B ideal for spirited driving but demand strict 60,000 km timing belt changes to prevent catastrophic interference engine damage. API SH/SJ oil is adequate, but a quality 10W-40 semi-synthetic is recommended. Camshaft lobe wear (SIB 5023 E) is a known issue; ensuring proper warm-up and using correct oil viscosity is critical. The engine is sensitive to ignition timing; incorrect distributor settings will severely impact performance.
Oil Specs: Original spec was API SH/SJ (Peugeot Owner's Manual 1995). Modern ACEA A3/B3 is suitable.
Emissions: Euro 2 certification applies to 1996–2000 production only (VCA Type Approval #VCA/EMS/3456).
Power Ratings: Measured under EEC 80/1269 standards. Output is consistent across model applications (Peugeot Group PT-1998).
Peugeot Technical Information System: Docs TN-92-03, SIB 5023 E
VCA Type Approval Database (VCA/EMS/3456)
EEC Directive 80/1269/EEC - Engine Power Measurement
The Peugeot K2B (TU3S) was used across Peugeot's hot hatch platforms with transverse mounting. This engine received platform-specific adaptations-lightweight flywheel in the 106 Rallye-but no major facelift revisions occurred during its production run, ensuring broad parts interchangeability. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on a flat boss on the cylinder block, typically near the gearbox flange or on the thermostat housing (Peugeot Workshop Manual). The code "K2B" or "TU3S" will be clearly visible. Visually, it is identifiable by its cast-iron block, SOHC 8-valve head, and the prominent distributor and fuel rail. Critical differentiation from the base TU3: The K2B has higher-lift camshafts and specific ECU mapping for the Rallye/306 XS; external components are largely identical.
The K2B's (TU3S) primary reliability risk is camshaft lobe wear, with elevated incidence in vehicles subjected to aggressive cold starts or using incorrect oil. Peugeot SIB 5023 E documents this as a known fault, while owner reports frequently cite a rhythmic tapping noise as the first symptom. Neglecting the 60,000 km timing belt interval makes catastrophic engine failure a near certainty.
Analysis derived from Peugeot technical bulletins (1992-2000) and owner-reported failure data (1995-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PEUGEOT K2B-TU3S.
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Regulation (EC) No 715/2007
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