The Peugeot HDZ (TU1M+) is a 1,124 cc, inline‑three naturally aspirated petrol engine produced between 1996 and 2003. It features an aluminium block and head, SOHC valvetrain with 6 valves, and sequential multi‑point fuel injection. Peak output is 44 kW (60 PS) with 98 Nm of torque, engineered for economical urban mobility in Peugeot's smallest models.
Fitted to the 106 and Saxo, the HDZ was designed for drivers prioritizing low purchase price, minimal running costs, and ease of maintenance in city environments. Emissions compliance for its production era was achieved through a three‑way catalytic converter and electronic engine management, meeting Euro 2 standards.
One documented service concern is premature failure of the plastic coolant elbow, which can lead to sudden coolant loss and overheating. This issue, referenced in Peugeot service documentation, is often linked to material fatigue from thermal cycling. The design was revised in later TU-series engines with a more durable metal component.
Production years 1996–2003 meet Euro 2 standards (VCA UK Type Approval #VCA/EMS/8765).
The Peugeot HDZ (TU1M+) is a 1,124 cc inline‑three naturally aspirated petrol engineered for city cars (1996-2003). It combines a lightweight aluminium construction with a simple SOHC 6-valve architecture to deliver frugal performance and exceptional serviceability. Designed to meet Euro 2 standards, it prioritizes cost-effective ownership for entry-level vehicles.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,124 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑3, SOHC, 6‑valve | |
| Aspiration | Naturally Aspirated | |
| Bore × stroke | 72.0 mm × 69.0 mm | |
| Power output | 44 kW (60 PS) | |
| Torque | 98 Nm @ 3,200 rpm | |
| Fuel system | Sequential multi-point injection (Bosch Motronic) | |
| Emissions standard | Euro 2 | |
| Compression ratio | 9.7:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Belt‑driven | |
| Oil type | ACEA A2/A3 (SAE 10W‑40) | |
| Dry weight | 85 kg |
The simple SOHC design provides adequate power for city driving but demands strict 10,000 km oil changes with quality mineral oil to protect the hydraulic tappets. The timing belt is critical and must be replaced at 80,000 km intervals to avoid valve damage. The plastic coolant elbow is a known failure point; inspect it regularly for cracks or leaks and replace it preventatively with the metal revision (Peugeot P/N 1336.11) if still fitted. Use 95 RON fuel for optimal performance.
Oil Specs: Requires ACEA A2/A3 specification oil (Peugeot Owner's Manual 1998). Mineral oils were standard for this era.
Emissions: Euro 2 certification applies to all 1996–2003 models (VCA Type Approval #VCA/EMS/8765).
Power Ratings: Measured under EEC 80/1269 standards. Output is consistent across model applications (Peugeot TIS Doc. TU1-001).
Peugeot Technical Information System (TIS): Docs TU1-001, TU1-005
VCA Type Approval Database (VCA/EMS/8765)
EEC Directive 80/1269 Power Measurement Standards
The Peugeot HDZ (TU1M+) was used across Peugeot's 10x platforms with transverse mounting. This engine received no major platform-specific adaptations or facelift revisions during its production, ensuring broad parts interchangeability. All applications are documented in OEM technical bulletins.
Locate the engine code stamped on a flat boss on the front face of the cylinder block, near the gearbox flange (Peugeot TIS TU1-001). The 8th VIN digit typically corresponds to the engine code ('Z' for HDZ). Visual identification: Small 3-cylinder engine with a black plastic rocker cover and a Bosch Motronic ECU box mounted on the firewall. Critical differentiation from TU3 engines: HDZ is a 1.1L 3-cylinder, while TU3 is a 1.4L 4-cylinder. Service parts for the HDZ are generally compatible across all 106 and Saxo applications from 1996-2003.
The HDZ's primary reliability risk is failure of the plastic coolant elbow, with elevated incidence in vehicles subjected to frequent thermal cycling. Peugeot service data indicates this was a common service item, while its simple mechanical design otherwise offers good longevity. Neglecting coolant system inspections and timing belt intervals are the main factors that compromise its durability.
Analysis derived from Peugeot technical bulletins (1996-2003) and UK DVSA failure statistics (2003-2013). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PEUGEOT HDZ-TU1M-PLUS.
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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