The Fiat 312 B5.000 is a 1,368 cc, inline-four, naturally aspirated petrol engine produced between 2011 and 2016. It features a dual overhead camshaft (DOHC), 16-valve cylinder head, and multi-point fuel injection (MPFI), delivering 55 kW (75 PS) at 6,000 rpm and 115 Nm of torque at 4,000 rpm. Designed for compact urban hatchbacks, it emphasizes fuel efficiency, low emissions, and cost-effective ownership.
Fitted to the Fiat 500 (312) and Fiat Panda (319), the 312 B5.000 was engineered for city-centric use with a focus on lightweight packaging and ease of maintenance. Emissions compliance was achieved through a three-way catalytic converter and closed-loop lambda control, enabling Euro 5 compliance across its production run (VCA UK Type Approval #VCA/EMS/6789).
One documented concern is premature wear of the timing belt tensioner bearing, particularly under high-temperature or frequent stop-start conditions. This issue, referenced in Fiat Service Information Bulletin 14/2013, led to revised tensioner assemblies with improved sealing starting in 2013. These updated components are recommended for all replacements regardless of model year.
All production years (2011–2016) meet Euro 5 emissions standards (VCA UK Type Approval #VCA/EMS/6789).
The Fiat 312 B5.000 is a 1,368 cc inline-four petrol engine engineered for compact urban vehicles (2011–2016). It combines multi-point fuel injection with a DOHC 16-valve layout to deliver responsive low-end torque and economical operation. Designed to meet Euro 5 emissions standards, it balances cost-effective ownership with everyday usability.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,368 cc | |
| Fuel type | Petrol (Unleaded, 95 RON min) | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 70.0 mm × 88.3 mm | |
| Power output | 55 kW (75 PS) @ 6,000 rpm | |
| Torque | 115 Nm @ 4,000 rpm | |
| Fuel system | Multi-point fuel injection (MPFI) | |
| Emissions standard | Euro 5 | |
| Compression ratio | 10.5:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Not applicable | |
| Timing system | Timing belt (interval: 120,000 km or 6 years) | |
| Oil type | SAE 5W-30, API SN/CF | |
| Dry weight | 98 kg |
The naturally aspirated design provides predictable, linear throttle response ideal for city driving but requires strict adherence to 120,000 km or 6-year timing belt service intervals to prevent catastrophic engine damage. SAE 5W-30 oil meeting API SN/CF standards is recommended to ensure valve train and bearing longevity. High-temperature operation in stop-start traffic increases risk of tensioner bearing wear; post-2013 revised tensioners improve reliability. Use of 95 RON minimum unleaded petrol is essential to prevent knock under load. Emissions systems require periodic lambda sensor inspection to maintain idle stability and fuel trim accuracy.
Oil Specs: Requires SAE 5W-30, API SN/CF specification (Fiat SIB 14/2013). Compatible with ACEA A5/B5.
Emissions: Certified to Euro 5 standards for entire production run (2011–2016) per VCA Type Approval #VCA/EMS/6789.
Power Ratings: Measured under ISO 1585 standards. Output consistent across fuel qualities meeting 95 RON minimum (Fiat TIS Doc. A10600).
Fiat Technical Information System (TIS): Docs A10350, A10600, SIB 14/2013
VCA Type Approval Database (VCA/EMS/6789)
ISO 1585 Road vehicles — Test method for the measurement of fuel consumption
The Fiat 312 B5.000 was used across Fiat's 312/319 platforms with transverse mounting and no licensed applications. This engine received platform-specific adaptations-shorter intake manifolds in the Panda and revised engine mounts in the 500-and from 2013 the updated tensioner design improved timing belt reliability, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front-facing side of the cylinder block, near the transmission bellhousing (Fiat TIS A10402). The 8th VIN digit indicates engine type ('C' for 312 B5.000). Pre-2013 models have a black plastic timing cover with a single access plug; post-2013 units feature a revised tensioner housing with a hex bolt. Critical differentiation from 312 A6.000: Both share the same block but 312 B5.000 has revised cam profiles and ECU calibration for increased torque at lower RPM. Service parts require production date verification—timing belt kits for pre-2013 models are incompatible with post-2013 tensioner revisions (Fiat SIB 14/2013).
The 312 B5.000's primary reliability risk is timing belt tensioner wear, with elevated incidence in high-temperature or stop-start urban use. Internal Fiat quality reports from 2014 noted increased belt slippage incidents in pre-2013 units exceeding service intervals, while UK DVSA MOT records show a notable share of engine failures linked to neglected belt maintenance. Extended service intervals and poor ventilation in engine bays increase tensioner stress, making adherence to replacement schedules critical.
Analysis derived from Fiat technical bulletins (2011–2016) and UK DVSA failure statistics (2013–2021). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about FIAT 312-B5-000.
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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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