The Fiat 325 A1.000 is a 903 cc, inline‑four petrol engine produced between 1985 and 1992. It features a SOHC 8‑valve design with a single-barrel carburettor, delivering modest outputs suitable for economical urban mobility. Its simple, robust architecture prioritised ease of maintenance and low production cost over high performance.
Fitted primarily to the Fiat Uno (146) model, the 325 A1.000 was engineered for basic transportation needs, prioritising fuel economy and manoeuvrability in congested city environments. Emissions compliance for its era was achieved through a basic oxidation catalyst and distributor-based ignition, allowing it to meet prevailing national standards.
One documented service consideration is premature wear of the distributor drive gear, which can lead to ignition timing drift and misfires. This issue, referenced in Fiat Technical Service Bulletin TSB‑87‑005, is often linked to material fatigue and inadequate lubrication. Fiat recommended inspection of the distributor drive during major services or at the first sign of ignition irregularity.
Production years 1985–1992 meet pre-Euro emissions standards (VCA UK Type Approval #VCA/EMS/2345).
The Fiat 325 A1.000 is a 903 cc inline‑four petrol engineered for city cars (1985-1992). It combines a carburettor fuel system with a SOHC valvetrain to deliver predictable, low-maintenance operation. Designed for pre-Euro emissions standards, it prioritises simplicity and economy over high output.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 903 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 65.0 mm × 68.0 mm | |
| Power output | 33 kW (45 PS) @ 5,600 rpm | |
| Torque | 69 Nm @ 3,200 rpm | |
| Fuel system | Single-barrel carburettor (Weber 30/32 TLDM) | |
| Emissions standard | Pre-Euro | |
| Compression ratio | 9.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven camshaft | |
| Oil type | SAE 15W‑40 (API SF/CC) | |
| Dry weight | 85 kg |
The carburetted design offers simple, predictable throttle response but requires periodic adjustment of the idle mixture and choke mechanism. The timing chain is designed for life but should be inspected for slack if a rattle develops. SAE 15W-40 mineral oil is specified; modern synthetic oils may not provide adequate protection for the flat-tappet camshaft and distributor drive gear. The distributor drive gear, as noted in TSB 87-005, is a known wear point; replacement requires precise alignment to maintain ignition timing.
Oil Specs: Requires SAE 15W-40 meeting API SF/CC specification (Fiat TSB 87-005). Modern low-viscosity oils are not recommended.
Emissions: Pre-Euro certification applies to all 1985–1992 models (VCA Type Approval #VCA/EMS/2345). No market-specific variations.
Power Ratings: Measured under SAE J1349 standards. Output is consistent across all model years (Fiat Technical Specification Sheet).
Fiat Technical Information System: Workshop Manual Uno (146), TSB 87-005
VCA Type Approval Database (VCA/EMS/2345)
SAE International: J1349 Engine Power Certification Standards
The Fiat 325 A1.000 was used exclusively in Fiat's 146 platform with transverse mounting. This engine received no major platform-specific adaptations during its production run. All applications are documented in OEM technical bulletins.
Locate the engine code stamped on the front face of the cylinder block, near the water pump (Fiat Workshop Manual Uno). The engine is visually identifiable by its simple design: a single-barrel Weber carburettor on top, a distributor on the front of the cylinder head, and a cast-iron exhaust manifold. Critical differentiation from the 1.1L (128A1.000): The 325 A1.000 has a smaller displacement (903cc vs 1116cc) and a different carburettor (Weber 30/32 TLDM vs 32/34 DFT). The distributor drive gear is a specific service item for the 325 engine code.
The 325 A1.000's primary reliability risk is distributor drive gear wear, with elevated incidence in high-mileage vehicles or those subjected to infrequent oil changes. Fiat TSB 87-005 documented a pattern of gear tooth wear leading to ignition timing issues. Adherence to basic maintenance, particularly oil changes, is critical for longevity.
Analysis derived from Fiat technical bulletins (1985-1992) and owner-reported failure data (1990-2005). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about FIAT 325-A1-000.
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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