The Peugeot H1B, also known as the TU1, is a 1,124 cc, inline‑four naturally aspirated petrol engine produced between 1986 and 1996. It features a single overhead camshaft (SOHC) with 8 valves and a carburettor or single — point fuel injection system, depending on the model year. This simple, lightweight design delivered 44 kW (60 PS) and 88 Nm of torque, prioritizing fuel efficiency and low — cost ownership for city and suburban driving.
Fitted to entry — level models such as…
Production years 1986–1992 meet pre-Euro standards; 1993–1996 models meet Euro 1 standards .
The Peugeot H1B (TU1) is a 1,124 cc inline‑four naturally aspirated petrol engine engineered for superminis (1986-1996). It combines a simple SOHC 8-valve design with carburetion or basic fuel injection to deliver dependable, economical performance. Designed for Euro 1 compliance in later years, it prioritizes low running costs and ease of maintenance over outright performance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,124 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, SOHC, 8‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 72.0 mm × 69.0 mm | |
Power output | 44 kW (60 PS) | |
Torque | 88 Nm @ 3,200 rpm | |
Fuel system | Carburettor or SPI (Single Point Injection) | |
Emissions standard | Pre-Euro (1986-1992); Euro 1 (1993-1996) | |
Compression ratio | 9.3:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Belt‑driven camshaft | |
Oil type | API SG/SH (SAE 10W‑40) | |
Dry weight | 95 kg |
The Peugeot H1B (TU1) was used across Peugeot's supermini platforms 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.
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The H1B's (TU1) primary reliability risk is timing belt tensioner pulley failure, with elevated incidence in vehicles with extended service intervals or exposure to moisture. Peugeot SIB 5011 C documents this as a known fault, while owner reports frequently cite sudden engine silence as the first symptom. Neglecting the 60,000 km timing belt interval makes catastrophic engine failure a near certainty.
Analysis derived from Peugeot technical bulletins (1986-1996) and owner-reported failure data (1990-2023). 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 H1B is renowned for its exceptional long-term reliability and simplicity when properly maintained. Its robust, low-stress design is inherently durable. The critical factors are adhering to the 60,000 km timing belt and tensioner change and addressing carburettor or ignition system wear promptly. With basic care, these engines can easily exceed 200,000 km.
The most frequent issues are timing belt tensioner pulley failure (SIB 5011 C), carburettor wear causing running problems, distributor cap/rotor arm failure leading to misfires, and coolant leaks from the plastic thermostat housing. These are well-documented in Peugeot service bulletins and owner forums.
The H1B (TU1) engine was primarily fitted to the Peugeot 106 (1991-1996) and the Peugeot 205 (1986-1994). It was the base 1.1L petrol engine for these supermini models, providing an economical entry point into the Peugeot range during that era.
Modest gains are possible. For carburettor models, fitting a performance carburettor, sports exhaust, and aggressive camshaft can yield 5-10 kW. SPI models can be remapped for minor gains. Significant power increases are impractical without forced induction, which is complex and costly on this engine. It's better suited to reliability than tuning.
Excellent for its time. In a Peugeot 106, expect real-world figures of around 6.5 L/100km (43 mpg UK) in mixed driving and 5.5 L/100km (51 mpg UK) on the highway. The slightly heavier 205 will return similar figures, typically 6.5-7.0 L/100km (40-43 mpg UK) combined, making it a very economical choice.
Yes. The H1B is an interference engine. If the timing belt breaks or slips due to tensioner failure, the pistons will collide with the open valves, causing severe and expensive damage to the cylinder head. This makes the 60,000 km timing belt and tensioner replacement interval absolutely critical.
Peugeot originally specified API SG/SH grade oil, typically a 10W-40 mineral oil. A modern equivalent is an ACEA A3/B3 10W-40 semi-synthetic oil. Using a quality petrol engine oil is sufficient; there are no special low-ash requirements like on modern diesels.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
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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