Alfa Romeo AR06420 2.0L petrol engine for sale.

Alfa Romeo AR06420 2.0L 4-cylinder, 8-valve Twin Spark petrol engine

Lively Performance, Responsive Acceleration Used Engine for Sale.

The Alfa Romeo AR06420 2.0L petrol engine is a classic and dependable power unit celebrated for its smooth performance, responsive character and timeless Alfa engineering.

Designed during the era when Alfa Romeo perfected its Twin Spark ignition technology, this 2.0L engine delivers lively acceleration, efficient combustion and a distinctly sporty driving feel. For owners needing a reliable replacement due to high mileage, worn internals or timing belt failure, the AR06420 provides an authentic OEM-spec solution that restores original performance and drivability to your Alfa.

The AR06420 engine is most commonly fitted to the Alfa Romeo 75 (Milano) and certain late versions of the Alfa Romeo Giulietta and Alfa Romeo Alfetta models.

These vehicles form the primary compatible range, furthermore making the AR06420 ideal for restoration projects, classic rebuilds or maintaining originality in vintage Alfa Romeo models. Its robust mechanical design and relatively simple component layout also make installation and servicing more straightforward compared to later 16-valve Twin Spark engines.

Specifications, Common weaknesses and Maintenance.

In terms of specifications, the AR06420 features a 2.0-litre inline-four configuration with an 8-valve DOHC layout, paired with Alfa Romeo’s well-known Twin Spark system that uses two spark plugs per cylinder for improved fuel burn and better throttle response.

Multi-point fuel injection, also efficient cooling, and a balanced crankshaft design contribute to smooth operation and strong mid-range torque. This engine’s durability and mechanical simplicity make it a favourite among enthusiasts who appreciate traditional Alfa engineering.

However, like other early Twin Spark engines, the AR06420 has a few common weaknesses to be aware of. Timing belt replacement is critical and must be performed every 60,000–70,000 km to avoid serious internal damage. Moderate oil consumption is normal and requires frequent level checks.

Age-related issues such as worn variators, failing ignition coils, vacuum leaks and sensor degradation may also appear on older engines. Using high-quality synthetic oil, maintaining a healthy cooling system and following strict service intervals will significantly increase engine reliability and longevity.

With proper care, the Alfa Romeo AR06420 2.0L petrol engine remains a strong, engaging and collectible powertrain choice for classic Alfa Romeo vehicles.