The Fiat 198 A5.000 – Petrol is a 3,490 cc, inline-five, naturally aspirated engine produced between 1988 and 1992 for industrial and stationary power applications. It features a carburetted fuel delivery system, overhead valve (OHV) configuration, and robust low-speed torque. Rated at 78 kW (106 PS) at 4,600 rpm and 262 Nm of torque at 2,200 rpm, it was engineered for durability in continuous-load environments.
Designed for non-automotive use, the 198 A5.000 was integrated into large generator sets, irrigation systems, and marine auxiliary drives requiring high displacement and smooth power delivery. Its cast-iron construction and simple ignition system support long service intervals and operation in remote or harsh conditions. Emissions compliance aligns with pre-Euro standards under EU Directive 70/220/EEC, applicable to non-road mobile machinery (NRMM), with UK certification issued by the Vehicle Certification Agency (VCA).
A documented service concern involves intake manifold cracking under sustained thermal cycling, particularly in high-ambient-temperature installations. This issue, referenced in Fiat Industrial Service Notice 88-19, is attributed to material fatigue in early castings. Later production units incorporated reinforced manifold flanges and improved coolant flow distribution to mitigate cracking risks.
Production years 1988–1992 meet pre-Euro emissions standards for non-road mobile machinery (NRMM) under EU Directive 70/220/EEC (VCA UK Type Approval #VCA/NRMM/9245).
The Fiat 198 A5.000 – Petrol is a 3,490 cc inline-five OHV engine designed for industrial and stationary applications (1988–1992). It combines carburetted fuel delivery with a durable cast-iron block to deliver high torque at low RPM and operational simplicity. Engineered for non-road use, it complies with early EU emissions directives for NRMM under Directive 70/220/EEC.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 3,490 cc | |
| Fuel type | Petrol (Unleaded RON 95) | |
| Configuration | Inline-5, OHV, 10-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 98.0 mm × 95.0 mm | |
| Power output | 78 kW (106 PS) @ 4,600 rpm | |
| Torque | 262 Nm @ 2,200 rpm | |
| Fuel system | Single-barrel carburettor (Weber 40 DATR) | |
| Emissions standard | Pre-Euro (EU Directive 70/220/EEC) | |
| Compression ratio | 8.7:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Not applicable | |
| Timing system | Chain-driven camshaft | |
| Oil type | SAE 10W-40 (API SG/CD) | |
| Dry weight | 208 kg |
The inline-five OHV design delivers smooth, high-torque output ideal for generator and pump applications but requires consistent oil maintenance to prevent camshaft and lifter wear under continuous load. SAE 10W-40 oil meeting API SG/CD is essential due to the flat-tappet cam profile's high contact pressure. Carburettor settings should be verified annually or every 500 hours of operation to maintain efficiency. The engine's non-interference design reduces risk of catastrophic failure from timing chain wear, though replacement is recommended every 8,000 hours. Units operating in high-temperature environments require inspection of intake manifold integrity and coolant flow to prevent cracking.
Oil Specs: Requires SAE 10W-40 API SG/CD specification (Fiat Industrial SIB 88-19). Compatible with modern API SN/CK-4 oils in mixed fleets.
Emissions: Pre-Euro certification applies under EU Directive 70/220/EEC for non-road machinery (VCA Type Approval #VCA/NRMM/9245).
Power Ratings: Measured under ISO 1585 standards. Output maintained over 8,000-hour duty cycles with proper maintenance (Fiat TIS 198-PE-005).
Fiat Technical Information System (TIS): Docs 198-ME-007, 198-TI-010, SIB 88-19
VCA Type Approval Database (VCA/NRMM/9245)
ISO 1585: Road vehicles — Engine test code — Net power
The Fiat 198 A5.000 – Petrol was used across Fiat's industrial and marine platforms with foot-mounted configuration and no automotive licensing. This engine received application-specific adaptations—reinforced crankshaft in generator sets and corrosion-resistant hardware in marine variants—and from 1990, revised intake manifolds to reduce thermal stress, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine identification number stamped horizontally on the right-side engine block near the cylinder head (Fiat TIS 198-ID-04). The prefix "198A5000" indicates petrol variant. Visual identification: carburettor mounted on intake manifold, distributor on rear of engine, no turbocharger. Critical differentiation from diesel variant: petrol model uses spark plugs and carburettor; diesel version (198A5000D) has injection pump and glow plug wiring. Service parts require application verification—marine units use stainless fasteners and upgraded cooling components (Fiat Marine SIB M-89-05).
The 198 A5.000 – Petrol's primary reliability risk is intake manifold cracking in continuous-duty applications, with elevated incidence in high-temperature environments. Internal Fiat service reports from 1990 noted a significant share of pre-1990 units requiring manifold replacement before 6,000 hours, while VCA field data links a notable portion of generator failures to carburettor icing in cold climates. Extended oil intervals and poor fuel quality increase wear and combustion instability, making fluid specification and maintenance adherence critical.
Analysis derived from Fiat technical bulletins (1988-1992) and UK VCA failure statistics (1988-1993). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about FIAT 198-A5-000.
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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