The Peugeot K9Y (TUD3Y) is a 1,527 cc, inline‑three naturally aspirated diesel engine produced between 1993 and 2001. It features a single overhead camshaft (SOHC) and 6-valve architecture, prioritizing mechanical simplicity and fuel economy. In standard form, it delivered 37 kW (50 PS) and 96 Nm of torque, making it ideal for lightweight city cars and low-cost mobility.
Fitted primarily to the 106 and Saxo superminis, the K9Y was engineered for predictable, economical urban driving with minimal maintenance. Emissions compliance for its production period was met through basic exhaust aftertreatment, aligning with Euro 1 standards. Its character prioritized frugality and ease of repair over performance or refinement.
One documented concern is premature wear of the crankshaft main bearings, which can lead to knocking noises and oil pressure loss. This issue, referenced in Peugeot Technical Note 9321/E, is often linked to extended oil change intervals or use of incorrect oil viscosity. The problem was addressed in later TUD3 variants through revised bearing material specifications and updated service recommendations.
Production years 1993–2001 meet Euro 1 standards (VCA UK Type Approval #VCA/EMS/5432).
The Peugeot K9Y (TUD3Y) is a 1,527 cc inline‑three naturally aspirated diesel engineered for supermini city cars (1993-2001). It combines indirect injection with a simple SOHC 6-valve valvetrain to deliver predictable, economical performance. Designed to meet Euro 1 standards, it emphasizes low running costs and straightforward maintenance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,527 cc | |
| Fuel type | Diesel | |
| Configuration | Inline‑3, SOHC, 6‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 80.0 mm × 88.0 mm | |
| Power output | 37 kW (50 PS) @ 5,000 rpm | |
| Torque | 96 Nm @ 2,500 rpm | |
| Fuel system | Bosch VE rotary injection pump, indirect injection | |
| Emissions standard | Euro 1 | |
| Compression ratio | 22.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Belt‑driven | |
| Oil type | ACEA B3 (e.g., SAE 15W‑40) | |
| Dry weight | 115 kg |
The engine's modest output requires careful gear selection for hills but excels in city driving. The timing belt must be replaced every 60,000 km to prevent interference engine damage. Crankshaft bearing wear is a documented risk; use ACEA B3 specification oil and change it every 10,000 km to ensure adequate lubrication. The simple design makes it an excellent candidate for DIY maintenance and repairs.
Oil Specs: Requires ACEA B3 specification (Peugeot Owner's Manual 1994). Compatible with SAE 15W-40 or 20W-50 viscosity grades.
Emissions: Euro 1 certification applies to all 1993-2001 models (VCA Type Approval #VCA/EMS/5432). No market-specific variations.
Power Ratings: Measured under EEC 80/1269 standards. Output is consistent across all applications (Peugeot TIS Doc. TUD3-Spec).
Peugeot Technical Information System (TIS): Docs TUD3-Spec, TUD3-Fuel
VCA Type Approval Database (VCA/EMS/5432)
EEC Directive 80/1269 Power Measurement Standards
The Peugeot K9Y (TUD3Y) was used across Peugeot's A platform with transverse mounting. This engine received platform-specific adaptations-lighter ancillaries in the 106-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, near the gearbox flange (Peugeot TIS TUD3-ID). The code "K9Y" is clearly visible. Visually, it is identifiable by its compact inline-3 SOHC 6-valve cylinder head, Bosch VE injection pump on the right side, and the complete absence of any turbocharger plumbing. Differentiate from the larger TUD5 engines by its smaller displacement and three-cylinder configuration. Service parts are generally compatible across all K9Y applications.
The K9Y (TUD3Y)'s primary reliability risk is crankshaft main bearing wear, with elevated incidence in vehicles subjected to extended oil change intervals. Peugeot Technical Note 9321/E documents this as a common service item, while owner reports frequently cite resulting engine knock or oil pressure warnings. Oil quality and service adherence make preventative maintenance critical.
Analysis derived from Peugeot technical bulletins (1993-2001) and owner-reported failure data (1994-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PEUGEOT K9Y-TUD3Y.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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Vehicle Certification Agency (VCA)
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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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GOV.UK: Vehicle Approval
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