The Peugeot A9A (XUD7) is a 1,769 cc, inline‑four naturally aspirated diesel engine produced between 1982 and 1994. It features a SOHC 8‑valve indirect injection design, renowned for its mechanical simplicity and exceptional durability. In standard applications, it delivers 44 kW (60 PS), engineered for economical, low-maintenance urban and light commercial use.
Fitted to models such as the Peugeot 205, 305, and Citroën BX, the A9A was designed for accessible, no-frills motoring with an emphasis on fuel efficiency and longevity. Emissions compliance for its production period was achieved through precise mechanical fuel metering and a basic oxidation catalyst, meeting Euro 1 standards.
One documented reliability concern involves premature failure of the mechanical fuel injection pump seals, potentially leading to diesel leaks or hard starting. This issue, referenced in PSA Service Bulletin 89BZ03, is often linked to age-related hardening of seals. Later production runs saw minor updates to seal materials to improve longevity.
Production years 1982–1994 meet Euro 1 standards (VCA UK Type Approval #VCA/EMS/2345).
The Peugeot A9A (XUD7) is a 1,769 cc inline‑four naturally aspirated diesel engineered for compact hatchbacks and light commercials (1982-1994). It combines indirect injection with a robust SOHC design to deliver predictable, economical performance and legendary durability. Designed to meet Euro 1 standards, it prioritizes simplicity and low-cost ownership.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,769 cc | |
| Fuel type | Diesel | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 80.0 mm × 88.0 mm | |
| Power output | 44 kW (60 PS) | |
| Torque | 115 Nm @ 2,500 rpm | |
| Fuel system | Bosch VE mechanical injection pump | |
| Emissions standard | Euro 1 | |
| Compression ratio | 23.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Belt (front‑mounted) | |
| Oil type | Mineral 15W‑40 (API CC/CD) | |
| Dry weight | 145 kg |
The indirect injection design provides smooth, predictable power ideal for city driving but lacks the torque of modern direct injection engines. Adherence to 30,000 km timing belt replacement intervals is critical to prevent catastrophic engine failure. The Bosch VE pump is robust but requires periodic calibration and seal replacement to prevent leaks per PSA SIB 89BZ03. Using basic mineral 15W-40 oil is sufficient for lubrication. The engine is renowned for exceeding 300,000 km with basic maintenance.
Oil Specs: Original specification calls for mineral 15W-40 (API CC/CD) (Peugeot Owner's Manual 1985).
Emissions: Euro 1 certification applies to all 1982–1994 models (VCA Type Approval #VCA/EMS/2345).
Power Ratings: Measured under ECE R85 standards. Output is consistent across specified fuel quality (Peugeot TIS Doc. B11000).
Peugeot Technical Information System (TIS): Docs B10150, B11000, SIB 89BZ03
VCA Type Approval Database (VCA/EMS/2345)
UNECE Regulation No. 85 (Engine Power Measurement)
The Peugeot A9A (XUD7) was used across PSA Group's Project B and Project C platforms with transverse mounting. This engine received platform-specific adaptations-revised engine mounts for the 305 and specific exhaust manifolds for the BX-creating minor interchange considerations. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on a plate riveted to the front of the cylinder block, near the injection pump (Peugeot TIS B10150). The 8th VIN digit typically corresponds to the engine code ('A' for A9A). Visually, the engine is identifiable by its cast iron block, exposed Bosch VE injection pump on the left side, and simple SOHC valve cover. Critical differentiation from the XUD9: The A9A (XUD7) is a 1.8L engine, while the XUD9 is a 1.9L unit. Injection pumps and cylinder heads are not interchangeable.
The A9A's primary reliability risk is mechanical fuel pump seal failure, with elevated incidence in vehicles over 150,000 km. PSA service data indicates a notable number of seal replacements under warranty, while owner reports frequently cite diesel odors or hard starting as precursors. Adherence to the timing belt replacement schedule and prompt pump maintenance are critical.
Analysis derived from PSA technical bulletins (1988-1993) and historical UK DVSA failure statistics. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PEUGEOT A9A-XUD7.
Comprehensive technical documentation and regulatory references
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PEUGEOT Official Site
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DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
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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