Ford Focus ST Mk2 Manual Transmission Flywheel 2.5 Petrol HYDA 1559631

Ford Focus ST Mk2 Manual Transmission Flywheel 2.5 Petrol HYDA is an original component from the Flywheels and gears category, designed for the performance petrol engine paired with a manual transmission. This used OEM part ensures proper torque transfer, stable drivetrain operation, and correct compatibility with standard engine equipment.

Specifications and technical data

• SKU: 1559631
• Mark: Ford
• Condition: Used
• OEM Part Number: 1559631
• Substitutable numbers: 4N51-6477-FC, 4N516477FC, 1559631
• Fuel type: Petrol
• Gearbox type: Manual
• Part type: Flywheel
• Category: Flywheels & Flexplates

Purpose and function of the flywheel

The flywheel in the Ford Focus ST Mk2 is responsible for smoothing out the petrol engine's operation, stabilizing idle speed, and efficiently transferring power to the manual transmission. In the 2.5-liter performance-oriented unit, it plays a crucial role in drivetrain refinement, acceleration smoothness, and gear shifting precision. A properly selected flywheel:

• ensures the correct inertia of the crankshaft and piston system,
• reduces vibrations transmitted to the transmission,
• supports smooth starting and gear changes,
• maintains stable idle speed.

Compatibility with the petrol engine and manual transmission

The presented flywheel is designed for the 2.5 petrol engine in the HYDA version, paired with a manual transmission. This ensures the retention of factory clutch operating parameters, correct disc positioning, and proper fitment with the starter motor and other drivetrain components. By maintaining the original geometry and mass characteristics of the flywheel, the Focus ST Mk2 drivetrain retains the manufacturer-intended dynamics, throttle response, and predictable behavior at high RPMs.

Application in performance driving

The Ford Focus ST Mk2 is a vehicle with a distinct sporty character, which means the flywheel operates under increased load conditions. This used OEM component is a solution that allows you to maintain:

• consistency with the factory characteristics of the powertrain,
• adequate resistance to dynamic loads during intensive driving,
• predictable clutch behavior during rapid gear shifts. For users upgrading or servicing the drivetrain, choosing an original flywheel is beneficial in terms of durability, parameter repeatability, and compatibility with other system components.

Condition and installation aspects

The offered flywheel is a used part, which in practice allows for an economical replacement while maintaining OEM specifications. Before installation, it is recommended to perform a standard inspection of the working surfaces and clearances, and to ensure proper fitment with the current state of the clutch and starter motor in the vehicle. Replacing the flywheel in a Focus ST Mk2 is a standard service operation within the drivetrain and should be performed by a workshop experienced with manual transmissions in Ford vehicles. Proper installation directly affects shifting comfort and engine refinement.

Expansion of the Ford drivetrain system

If you are planning a comprehensive repair or upgrade of the drivetrain area in your Ford and need other components from the same group, such as additional flywheels, mating gears, or related transmission parts, check out the available parts in the Ford flywheels and gears category.

Technical support and additional knowledge

When planning upgrades for turbocharged units, it is worth expanding your knowledge on selecting used OEM components, their integration with accessories, and their impact on drivetrain characteristics. Examples of topics related to turbochargers, intercooler interfaces, and the selection of used components in performance-oriented cars can be found in the article Go-Kart Feeling XXL: used N18 turbocharger versus B48 – what to choose for a Mini Cooper S?.