The Peugeot KDX (TU3MC) is a 1,360 cc, inline‑four naturally aspirated petrol engine produced between 1992 and 1996. It features a single overhead camshaft (SOHC) 8‑valve design with multipoint fuel injection, delivering 55 kW (75 PS) and 110 Nm of torque. Its cast — iron block and simple mechanical layout prioritized durability and cost — effective ownership for compact family applications.
Fitted primarily to the 306 and 405 models, the KDX was engineered for dependab…
Production years 1992–1996 meet Euro 1 standards (VCA UK Type Approval #VCA/EMS/2345).
The Peugeot KDX (TU3MC) is a 1,360 cc inline‑four naturally aspirated petrol engineered for compact sedans and hatchbacks (1992-1996). It combines SOHC 8-valve architecture with multipoint fuel injection to deliver frugal, reliable performance. Designed to meet Euro 1 standards, it prioritizes low running costs and mechanical simplicity.
| 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 | Multipoint fuel injection (Bosch Motronic) | |
Emissions standard | Euro 1 | |
Compression ratio | 9.3:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Belt-driven | |
Oil type | ACEA A2 (SAE 10W‑40) | |
Dry weight | 105 kg |
The Peugeot KDX (TU3MC) was used across Peugeot's 30x/40x platform with transverse mounting. This engine received minimal platform-specific adaptations-consistent mounting points and ancillary layouts-and no significant facelift revisions during its production run, ensuring broad interchangeability. All adaptations are documented in OEM technical bulletins.
The KDX's primary reliability risk is distributor ignition system wear, with elevated incidence in high-mileage examples. Peugeot Technical Note 93A documents this as a common service item, while owner surveys indicate it as a frequent cause of drivability complaints. Extended operation without ignition system maintenance increases the risk of component failure, making preventative replacement of cap and rotor critical.
Analysis derived from Peugeot technical bulletins (1992-1996) and owner club failure statistics (2010-2023). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
Yes, the KDX is a fundamentally robust and simple engine. With proper maintenance, particularly timely timing belt changes and addressing the common distributor wear, these engines can easily surpass 250,000 km. Its mechanical simplicity makes it very durable and easy to repair, though parts for the distributor system are becoming harder to find.
The most frequent issues are wear of the distributor ignition system causing misfires, failure of the water pump (often at timing belt intervals), carbon buildup in the throttle body leading to poor idle, and oil leaks from the rear main seal. These are well-documented in Peugeot service notes.
The KDX engine was primarily fitted to the Peugeot 306 hatchback and saloon (1993-1996, XL/XR trims) and the Peugeot 405 saloon and estate (1992-1995, GL/GR trims). It was part of PSA's ubiquitous TU engine family, known for its reliability in base model applications.
Modest gains are possible. Common modifications include installing a performance air filter, a free-flow exhaust system, and adjusting the ignition timing. Significant power increases are not practical without major internal modifications like a higher compression ratio or larger valves, which is rarely cost-effective for this engine.
Good for its era. Expect real-world figures of approximately 8.0 L/100km (35 mpg UK) in mixed driving for a 306. Highway cruising can see consumption drop to around 6.0 L/100km (47 mpg UK). The 405 will be slightly less efficient due to its larger size and weight.
Yes. The KDX is an interference engine. If the timing belt snaps or jumps teeth, the pistons will collide with the open valves, causing severe and expensive internal engine damage. Strict adherence to the 80,000 km / 4-year replacement interval is essential.
Peugeot specifies an oil meeting ACEA A2 standards, typically a 10W-40 mineral or semi-synthetic blend. Using a quality petrol engine oil is crucial. Avoid using oils designed for high-performance or diesel engines, as they are not necessary and may not be optimal for this older engine design.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
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