The Peugeot CDY (TU9M) is a 1,360 cc, inline‑four naturally aspirated petrol engine produced between 1996 and 2003. It features an aluminum alloy block and head, single overhead camshaft (SOHC), and two valves per cylinder. In standard form, it delivered 55 kW (75 PS) and 110 Nm of torque, engineered for economical urban mobility and low running costs.
Fitted to models such as the 106, 206, and Saxo, the CDY was designed for drivers prioritizing fuel efficiency and straight…
Production years 1996–2003 meet Euro 2 standards .
The Peugeot CDY (TU9M) is a 1,360 cc inline‑four naturally aspirated petrol engineered for supermini applications (1996-2003). It combines multi-point fuel injection with a simple SOHC valvetrain to deliver predictable, frugal performance for city driving. Designed to meet Euro 2 standards, it prioritizes mechanical simplicity and low ownership costs.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,360 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, SOHC, 8‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 72.0 mm × 83.5 mm | |
Power output | 55 kW (75 PS) | |
Torque | 110 Nm @ 3,200 rpm | |
Fuel system | Multi-point fuel injection (Magneti Marelli IAW 8P) | |
Emissions standard | Euro 2 | |
Compression ratio | 9.7:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Belt-driven | |
Oil type | Peugeot B71 2290 (SAE 10W‑40) | |
Dry weight | 95 kg |
The Peugeot CDY (TU9M) was used across Peugeot's PSA platforms with transverse mounting. This engine received minor platform-specific adaptations-different engine mounts in the 206 versus the 106-with no major facelift revisions affecting core compatibility. All adaptations are documented in OEM technical bulletins.
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The CDY's primary reliability risk is failure of the plastic coolant thermostat housing, with elevated incidence in high-mileage examples. Peugeot service data indicates a notable failure rate after 100,000 km, while owner reports frequently cite coolant leaks as a cause for overheating. Inspecting and replacing the housing with the latest OEM part is a critical preventative measure.
Analysis derived from Peugeot technical bulletins (1998-2003) and historical service data. 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
The CDY is generally very reliable for its intended purpose as a city car engine. Its main weakness is the plastic thermostat housing, which should be inspected and replaced preventatively. With regular oil changes and timely replacement of the timing belt (every 80,000 km), these engines can easily reach 200,000 km or more with minimal issues.
The most frequent issues are plastic thermostat housing leaks, timing belt failure if neglected, ignition coil failures, and minor oil leaks from the cam cover gasket. These are well-documented in Peugeot service bulletins and are common, inexpensive fixes for this era of engine.
The CDY engine was primarily used in the second-generation 106 (1996-2003), the first-generation 206 (1998-2003), and the entire Saxo range (1996-2003). It was also shared with the Citroën Saxo. All applications were Euro 2 compliant and featured multi-point fuel injection.
Yes, but gains are modest due to the engine's simple 8-valve design. Basic tuning like a performance exhaust, cold air intake, and ECU remap can yield small power increases. More significant power requires internal modifications or an engine swap to a 16-valve TU engine, which is a popular upgrade in the 106/Saxo community.
Fuel economy is excellent for city driving. In a 106 or Saxo, expect combined figures around 6.0 L/100km (47 mpg UK). The slightly heavier 206 typically returns around 6.5 L/100km (43 mpg UK). Real-world economy is very good, making it a very economical choice for urban commuting.
Yes. The CDY is an interference engine. If the timing belt fails, the pistons will collide with the open valves, causing severe internal damage that requires a major engine rebuild. This makes adhering to the 80,000 km timing belt replacement interval absolutely critical.
Peugeot recommended a 10W-40 semi-synthetic oil for the CDY engine. Modern 10W-40 semi-synthetic oils meeting ACEA A3/B3 or equivalent specifications are ideal. Using the correct oil helps protect the engine and ensures smooth operation of the hydraulic valve lifters.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
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EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
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
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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