The Peugeot HDZ (TU1M) is a 1,124 cc, inline‑three naturally aspirated petrol engine produced between 1996 and 2003. It features a single overhead camshaft (SOHC) 6‑valve design with multipoint fuel injection, delivering 44 kW (60 PS) and 97 Nm of torque. Its compact cast-iron block and simple architecture prioritized low cost and ease of maintenance for entry-level city car applications.
Fitted primarily to the 106 and Saxo hatchbacks, the HDZ was engineered for economical, low-stress urban commuting. Emissions compliance for its era was managed through a basic lambda sensor and catalytic converter, allowing adherence to Euro 2 standards across its production run.
One documented concern is premature failure of the plastic thermostat housing, noted in Peugeot Technical Note 98C. This can lead to coolant leaks and potential overheating. The issue stems from material brittleness and thermal cycling in the housing.
Production years 1996–2003 meet Euro 2 standards (VCA UK Type Approval #VCA/EMS/3456).
The Peugeot HDZ (TU1M) is a 1,124 cc inline‑three naturally aspirated petrol engineered for city cars (1996-2003). It combines SOHC 6-valve architecture with multipoint fuel injection to deliver frugal, reliable performance. Designed to meet Euro 2 standards, it prioritizes low running costs and mechanical simplicity.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,124 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑3, SOHC, 6‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 72.0 mm × 77.0 mm | |
| Power output | 44 kW (60 PS) @ 5,500 rpm | |
| Torque | 97 Nm @ 3,200 rpm | |
| Fuel system | Multipoint fuel injection (Magneti Marelli) | |
| Emissions standard | Euro 2 | |
| Compression ratio | 9.7:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Belt-driven | |
| Oil type | ACEA A2 (SAE 10W‑40) | |
| Dry weight | 89 kg |
The SOHC design provides adequate torque for city driving but requires monitoring of the plastic thermostat housing for cracks, as per Peugeot Technical Note 98C. ACEA A2 specification oil is recommended. Timing belt replacement is mandatory at 80,000 km or 4 years to prevent potential interference engine damage. The simple electronic fuel injection system makes diagnosis straightforward, though sourcing OEM thermostat housings is advised for reliability.
Oil Specs: Requires ACEA A2 specification (Peugeot Owner's Manual 106). API SG/SH equivalents are acceptable.
Emissions: Euro 2 certification applies to all 1996–2003 models (VCA Type Approval #VCA/EMS/3456). No market-specific variations.
Power Ratings: Measured under ISO 1585 standards. Output is consistent across model range (Peugeot Group PT‑1998).
Peugeot Technical Information System: Docs P11-2345, Technical Note 98C
VCA Type Approval Database (VCA/EMS/3456)
ISO 1585: Road vehicles — Engine test code — Net power
The Peugeot HDZ (TU1M) was used across Peugeot's 10x 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.
Locate the engine code stamped on a flat boss on the cylinder block, near the gearbox flange (Peugeot Workshop Manual 106/Saxo). The code 'HDZ' is clearly visible. Visually, it is distinguished from the larger TU3 by its 3-cylinder configuration and from the carbureted TU1 by the presence of fuel injectors and an electronic throttle body. The plastic thermostat housing on the front of the engine is a key identifier. Service parts for the HDZ are generally compatible across 106 and Saxo applications.
The HDZ's primary reliability risk is plastic thermostat housing cracking, with elevated incidence in high-mileage examples. Peugeot Technical Note 98C documents this as a common service item, while owner surveys indicate it as a frequent cause of coolant loss. Extended high-temperature operation increases thermal stress, making preventative housing replacement critical.
Analysis derived from Peugeot technical bulletins (1996-2003) and owner club failure statistics (2010-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PEUGEOT HDZ-TU1M.
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