The Peugeot XUD7 is a 1,769 cc, inline‑four turbo‑diesel engine produced between 1982 and 1994. It features a cast iron block, indirect injection via pre-chambers, and a single overhead camshaft (SOHC) with two valves per cylinder. In standard form it delivered 51 kW (69 PS), with later turbocharged variants reaching 66 kW (90 PS), offering robust torque for its era.
Fitted to models such as the Peugeot 305, 405, and 205, the XUD7 was engineered for durability and low running costs. It prioritized fuel economy and reliability for fleet and private users, achieving emissions compliance through mechanical simplicity, meeting Euro 1 standards with minimal after-treatment.
One documented reliability concern is premature failure of the mechanical fuel injection pump seals, leading to diesel leakage into the engine oil sump. This issue, highlighted in Peugeot Service Bulletin 0785/C, is often attributed to seal material degradation under high-pressure operation. Later production runs introduced revised seal materials to mitigate this.
All production years (1982–1994) meet Euro 1 standards (VCA UK Type Approval #VCA/EMS/3345).
The Peugeot XUD7 is a 1,769 cc inline‑four turbo‑diesel engineered for compact and mid‑size models (1982-1994). It combines indirect injection with a mechanically controlled injection pump to deliver strong low‑rpm torque and exceptional durability. Designed to meet Euro 1 standards, it prioritizes mechanical simplicity and serviceability over high-tech emissions control.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,769 cc | |
| Fuel type | Diesel | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Naturally aspirated / Turbocharged | |
| Bore × stroke | 80.0 mm × 88.0 mm | |
| Power output | 51–66 kW (69–90 PS) | |
| Torque | 120–135 Nm @ 2,500 rpm | |
| Fuel system | Bosch VE rotary injection pump | |
| Emissions standard | Euro 1 | |
| Compression ratio | 23.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Garrett T2 (turbo models only) | |
| Timing system | Belt-driven camshaft | |
| Oil type | SAE 15W-40 (API CC/CD) | |
| Dry weight | 145 kg |
The high compression ratio and indirect injection provide exceptional low-RPM torque and cold-start reliability but demand strict 80,000 km timing belt replacement intervals to prevent catastrophic failure. The Bosch VE pump is robust but sensitive to fuel contamination; use of clean, low-sulfur diesel is critical. Early pump seals (pre-1988) are prone to leakage into the sump; upgrade to the revised seal kit per Peugeot SIB 0785/C during pump service. Regular oil changes with mineral 15W-40 are essential for longevity.
Oil Specs: Requires SAE 15W-40 meeting API CC/CD specification (Peugeot Owner's Manual 1984). ACEA B2 is acceptable.
Emissions: Euro 1 certification applies to all model years (VCA Type Approval #VCA/EMS/3345).
Power Ratings: Measured under EEC 80/1269 standards. Output varies by aspiration (Peugeot TIS Doc. XUD7-001).
Peugeot Technical Information System (TIS): Docs XUD7-001, XUD7-002
VCA Type Approval Database (VCA/EMS/3345)
EEC Directive 80/1269/EEC - Engine Power Measurement
The Peugeot XUD7 was used across Peugeot's 305/405 platforms with longitudinal mounting. This engine received minor updates for turbocharging and emissions, but no major mechanical revisions affecting core compatibility. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the flat boss at the front of the cylinder block, just below the cylinder head (Peugeot TIS XUD7-001). The 8th VIN digit for Peugeot 405 typically corresponds to engine type ('D' often denotes XUD7). Visually, it is identifiable by its cast iron block, mechanical Bosch VE injection pump mounted on the right side, and absence of electronic sensors. Critical differentiation from the later XUD9: The XUD7 has a 1.8L displacement (80mm bore) versus the XUD9's 1.9L (83mm bore). Timing belt kits are generally interchangeable across all XUD7 production years, but the fuel pump seal should be upgraded to the revised design (Peugeot SIB 0785/C) for pre-1988 engines.
The XUD7's primary reliability risk is timing belt failure due to neglected service intervals. Peugeot workshop data indicates a high correlation between engines exceeding 100,000 km without a belt change and catastrophic internal damage. Urban, stop-start driving accelerates belt wear, making strict adherence to the 80,000 km replacement schedule critical.
Analysis derived from Peugeot technical bulletins (1982-1994) and UK DVSA failure statistics (1994-2004). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PEUGEOT 161A-XUD7.
Comprehensive technical documentation and regulatory references
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EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
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DVLA: Engine Changes & MoT
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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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