Ford Focus ST Clutch Replacement: A Beginner Step Guide

Understanding the MTX-75 and EcoBoost Clutch Demands

The Ford Focus ST, equipped with the 2.0L EcoBoost engine and the MTX-75 6-speed manual transmission, remains a benchmark hot hatch. However, the factory clutch is a known weak point, especially for owners who have added aftermarket tunes. The stock clutch assembly typically begins to slip between 280 and 300 wheel horsepower due to the immense low-end torque generated by the turbocharged 4-cylinder engine. Furthermore, the Dual Mass Flywheel (DMF) is prone to premature wear from torsional vibrations, leading to rattling at idle and heavy pedal engagement.

Replacing the clutch on a Focus ST is a moderately advanced DIY job, but entirely achievable for a beginner with the right tools, a safe workspace, and strict adherence to torque specifications. This guide breaks down the ford focus st clutch replacement procedure into manageable, logical phases, ensuring you restore your EcoBoost's drivetrain to factory-fresh condition.

Essential Tools and OEM Part Numbers

Before turning a single wrench, gather the correct components. Cutting corners on the flywheel or slave cylinder will result in having to drop the transmission again in 10,000 miles. According to the RockAuto Ford Focus Clutch Catalog, the LuK RepSet is the industry standard for OEM replacement.

Pro Tip: You will also need a 32mm axle nut socket, an engine support bar, a transmission jack, a clutch alignment tool (usually included in the LuK kit), and a flare-nut wrench for the hydraulic line.

Phase 1: Top-Side Teardown and Axle Removal

The first phase involves clearing the engine bay and disconnecting the drivetrain from the wheels. Safety is paramount; ensure the vehicle is on a level surface and supported by high-quality jack stands rated for at least 3 tons.

1. Battery and Airbox Removal: Disconnect the negative battery terminal. Remove the 10mm and 8mm fasteners securing the battery box and the cold air intake assembly. This exposes the top bellhousing bolts and the shift tower.
2. Shift Linkage Detachment: The MTX-75 uses a cable shift linkage. Pry up the white plastic retaining clips on the shift cables and slide them off the ball studs. Unbolt the cable bracket from the transmission using a 13mm socket.
3. Starter and Reverse Light Switch: Unplug the reverse light sensor and the starter motor wiring. Remove the two 13mm bolts holding the starter and set it aside (no need to disconnect the main power cable, just zip-tie it out of the way).
4. Wheel and Axle Removal: Remove both front wheels. Use a breaker bar to crack the 32mm front axle nuts before lifting the car. Unbolt the lower control arm ball joints (18mm) and the sway bar end links to swing the struts outward. Pull the axles out of the MTX-75 differential. Warning: Be extremely careful not to tear the inner CV joint boots or damage the differential seals.

Phase 2: Subframe Support and Transmission Drop

Unlike older vehicles where the transmission can simply slide out sideways, the Focus ST requires lowering the rear of the subframe to create enough clearance to pull the MTX-75 out of the engine bay.

Engine and Subframe Support

Install an engine support bar across the top of the engine bay and secure a strap around the engine lifting eyelet. This takes the weight off the motor mounts. Next, place a floor jack under the rear crossmember of the front subframe. Remove the two massive rear subframe mounting bolts (21mm). Slowly lower the jack about 3 to 4 inches. This tilts the engine and transmission assembly backward, providing the critical angle needed to clear the chassis.

Bellhousing Separation

Support the transmission with a dedicated transmission jack. Remove the remaining bellhousing bolts (a mix of 15mm and 18mm, varying in length—map them out on a piece of cardboard). Disconnect the hydraulic clutch line from the Concentric Slave Cylinder (CSC) using a specialized quick-disconnect tool or a small pick to depress the internal collar. Once all bolts and grounds are removed, slide the transmission straight back. The input shaft will disengage from the clutch disc, allowing you to lower the MTX-75 to the ground.

Phase 3: Flywheel Inspection and Clutch Alignment

With the transmission out, you are staring directly at the flywheel and pressure plate. This is the most critical phase of the ford focus st clutch replacement process.

Removing the Old Assembly

Use an impact wrench or a flywheel holding tool to break loose the six flywheel bolts. Remove the pressure plate and the old clutch disc. Inspect the DMF. If you see heavy bluing (heat damage), deep grooves, or if the internal springs have excessive play, the DMF must be replaced. According to technical discussions on the FocusST.org Community Technical Forums, attempting to machine or resurface a Dual Mass Flywheel will destroy its internal damping mechanism, leading to catastrophic drivetrain chatter.

Installation and Torque Specifications

Clean the engine block mating surface with brake cleaner. Install the new DMF using the new Ford torque-to-yield bolts. The MTX-75 flywheel torque specification is 74 lb-ft (100 Nm). Do not guess this; use a calibrated torque wrench in a star pattern to ensure even clamping force.

Next, install the new CSC onto the transmission input shaft bearing retainer, securing it with the provided wire clip. Place the new clutch disc against the flywheel. Insert the clutch alignment tool through the disc splines and into the pilot bearing to center it perfectly. Mount the pressure plate and thread the M8 bolts by hand. Tighten the pressure plate bolts to 22 lb-ft (29 Nm) in a crisscross pattern, gradually drawing the pressure plate flat against the disc.

Phase 4: Reassembly and Hydraulic System Bleeding

Reassembly is the reverse of removal, but requires meticulous attention to the hydraulic system. Slide the transmission back into place, ensuring the input shaft splines mate smoothly with the clutch disc. If it binds, do not force it with the bellhousing bolts; realign the engine angle using your support bar. Torque the bellhousing bolts to 35 lb-ft (47 Nm).

Reinstall the axles, ensuring the circlips snap firmly into the differential side gears. The 32mm axle nuts must be torqued to a massive 214 lb-ft (290 Nm) and staked with a punch to prevent backing out.

The Dreaded Clutch Bleed

The Focus ST hydraulic clutch system is notorious for trapping air. Refill the brake master cylinder reservoir with fresh DOT 4 LV fluid. The most effective method for a DIYer is the gravity bleed combined with a vacuum extractor at the CSC bleeder valve. Open the bleeder valve located on top of the transmission bellhousing. Attach a vacuum pump to draw fluid and air bubbles out. Once a solid stream of bubble-free fluid is achieved, close the valve. Have a helper pump the clutch pedal 30 times to seat the CSC piston against the pressure plate fingers. Check the Ford Motorcraft Maintenance Guides for specific fluid level markers, as the clutch and brakes share the same reservoir.

2026 Cost Analysis: DIY vs. Professional Installation

As of early 2026, labor rates at specialty European and Ford performance shops have continued to climb. Here is a realistic breakdown of what you can expect to spend on this job.

By tackling the ford focus st clutch replacement yourself, you save over $1,500 in labor costs while gaining an intimate understanding of your EcoBoost's drivetrain. Take your time, respect the torque specs, and enjoy the crisp, slip-free engagement of a freshly installed clutch kit.