Slipping Clutch: A Garage's Guide

Can a Garage Repair a Slipping Clutch?

A slipping clutch is a common automotive issue that can leave drivers feeling frustrated and concerned about their vehicle's performance. When a clutch begins to slip, it means that the engine's power is not being fully transferred to the gearbox, resulting in a noticeable lack of acceleration and a tendency for the engine revs to rise without a corresponding increase in speed. The question on many a motorist's mind is whether their local garage is equipped to handle such a repair. The short answer is a resounding yes. Most reputable independent garages have the expertise, tools, and parts to diagnose and replace a slipping clutch effectively.

To illustrate the process, we'll delve into a real-world clutch replacement on a 2019 Peugeot Partner van, courtesy of REPXPERT, Alistair Mason. This detailed account will provide valuable insights into the complexities involved and highlight the skills required for a successful repair.

Vehicle Information and Initial Diagnosis

The vehicle in question is a Peugeot Partner van, equipped with a 1.6 HDI engine, boasting a mileage of 110,000 miles. The driver reported a "slipping" sensation from the clutch, a symptom that was swiftly confirmed by a brief road test. Following this confirmation, a clutch replacement was advised, with the necessary authorisation obtained to proceed with the work. The estimated book time for this repair is 5.4 hours, and importantly, it does not require any specialist, make-specific equipment, making it a manageable and profitable repair for most independent garages.

The Importance of Preparation: The REPXPERT App

Before commencing any significant repair, it's best practice to leverage available resources. In this case, Alistair Mason highlights the utility of the REPXPERT app. By scanning the QR code on the LuK clutch box (as shown in Fig.1), technicians can access a wealth of information. This includes any pertinent service bulletins relating to the product and detailed repair instructions, complete with essential torque settings. Furthermore, using the app can earn bonus points redeemable for goods in the bonus shop, adding an extra layer of value to the repair process.

Gearbox Removal: A Step-by-Step Breakdown

Removing a gearbox is a multi-stage process that requires careful disassembly and methodical organisation. Here’s a detailed look at the steps involved:

1. Access and Initial Disconnections: With the vehicle safely positioned on a lift, the bonnet is opened. The battery is disconnected and removed (Fig.2), which may involve unclipping some wiring for easier access. The plastic tray supporting the battery is removed, followed by the battery carrier itself. This preparation opens up the top of the gearbox area for further work.
2. Topside Components: Several components are then removed from the top of the gearbox. These include the air ducting from the front panel to the air box assembly, the gearbox earth strap, and the reverse light switch multiplug. The wiring loom is unclipped, and the wiring is carefully eased off the top bellhousing bolts. Subsequently, the top bellhousing bolts and upper starter motor bolts are removed. The gear change cables (Fig.3) are disconnected, and any accessible linkage bolts are removed.
3. Underside Access and Subframe Removal: The vehicle is raised to waist height to allow for the removal of the front wheels and the N/S (Near Side) hub nut and wheel arch liner. The lift is then raised further to gain access to the underside. To facilitate gearbox removal, the front subframe needs to be disconnected. This involves disconnecting both bottom ball joints and the anti-roll bar links. The exhaust mounting and DPF sensor at the rear of the subframe (Fig.4) are unbolted. The lower gearbox pendulum mounting and steering rack retaining nuts are then removed. Crucially, the steering rack is secured to the vehicle to keep it in place once the subframe is out.
4. Subframe and Gearbox Support: With the subframe supported by a transmission jack, all subframe mountings are removed, and the subframe is carefully taken out of the vehicle.
5. Gearbox Oil and Exhaust: The gearbox oil is drained. While the oil is draining, the exhaust front pipe is disconnected at its flexible joint. The oil drain plug is then refitted and torqued to the manufacturer's specified setting.
6. Starter Motor and Driveshaft Access: At the rear of the engine, the heat shield is removed to access the starter motor. The lower starter motor retaining bolts, support bracket, and then the lower bell housing bolts are removed. The three retaining bolts from the O/S (Off Side) driveshaft support (Fig.5) are removed. This allows the support housing to be eased out of the gearbox while leaving the driveshaft in position. The N/S driveshaft is then removed.
7. Slave Cylinder and Catalytic Converter Bracket: At the front of the engine, the two slave cylinder retaining bolts are removed, and the slave cylinder is eased away from the gearbox, ensuring the hydraulics remain connected. The nut and stud (Fig.6) securing the catalytic converter bracket to the engine block must be removed using a female Torx socket. This is essential to access a crucial bell housing bolt. Once removed, this bell housing bolt can be taken out.
8. Final Gearbox Mountings: With the engine supported by a suitable stand, access is gained to the engine bay to remove the top gearbox mounting. The engine and gearbox are lowered slightly to aid in the gearbox's removal. The gearbox is then supported by a transmission jack, and the final bell housing bolts are removed.
9. Gearbox Separation: The gearbox is carefully eased away from the engine. Once the gearbox input shaft is clear of the clutch assembly, the gearbox is lowered on the transmission jack and removed from the vehicle.

Clutch Replacement: The Core of the Repair

With the gearbox removed, the clutch assembly is now accessible. The process for replacing the clutch itself involves the following key steps:

1. Clutch Removal: The six clutch retaining bolts are removed, and the old clutch assembly is taken out. In this particular case, the clutch problem was immediately evident. The clutch lining had worn down to the rivets (Fig.7), indicating that it had reached the end of its service life.
2. Flywheel Preparation: The face of the flywheel is cleaned using emery cloth. This action is important for removing any glaze that may have built up on the surface. After cleaning, the flywheel is washed with clutch and brake dust cleaner.
3. Release System Inspection and Replacement: The release system within the gearbox bell housing is inspected and, if necessary, replaced. This involves removing the release bearing and release arm. Technicians must also inspect the ball pivot, release arm, and bearing guide tube for any signs of wear. In this instance, wear was present on the ball pivot and the release arm, necessitating their replacement after obtaining customer authorisation.
4. Bell Housing Cleaning and Lubrication: The bell housing area is thoroughly cleaned to remove any old clutch dust. A light smear of high melting point grease is applied to the guide tube and the gearbox input shaft before the new release system is installed.
5. New Clutch Plate Installation: The new clutch plate is mounted onto the input shaft. This serves a dual purpose: it confirms the correct fitment of the new part and helps to evenly distribute any grease. The clutch plate is then removed, and any excess grease is wiped off.
6. Pressure Plate and Flywheel Cleaning: It is crucial to ensure that both the flywheel and the new clutch pressure plate are clean and degreased. Clutch and brake dust cleaner is the recommended product for this task.
7. Clutch Alignment and Tightening: Using a clutch alignment tool (Fig.8), the new clutch plate is mounted onto the flywheel, ensuring that the "gearbox side" faces outwards. The clutch pressure plate is then mounted onto the dowels, and the six bolts are inserted. These bolts must be tightened in an even and sequential pattern, torqued to the manufacturer's specified settings.
8. Pre-Gearbox Installation Checks: Before refitting the gearbox, it's essential to ensure that both alignment dowels are correctly fitted and in good condition. If they appear worn, they should be replaced. Additionally, technicians must ensure that all cables and looms are clear and out of the way for the gearbox installation. It is also highly advisable to replace the driveshaft oil seal in the O/S driveshaft support housing, especially since it has already been removed during the process.

Gearbox Installation: Reversing the Process

The reinstallation of the gearbox is essentially the reverse of the removal process, with a few critical points to observe:

1. Gearbox Positioning: The gearbox is placed onto the transmission jack and brought close to the clutch assembly. Time should be taken to accurately align the gearbox with the clutch assembly.
2. Driveshaft and Dowel Alignment: The N/S driveshaft is aligned, and then the gearbox is carefully eased into position. It is vital to ensure that the gearbox locates correctly onto the alignment dowels.
3. Securing the Gearbox: Two bell housing bolts are inserted and tightened to secure the gearbox initially.
4. Top Mounting: Using the transmission jack, the engine and gearbox are raised to mount the top gearbox mounting, which is then secured in place.
5. Final Reassembly: The rest of the installation follows the reverse order of removal. This includes refitting the subframe, driveshafts, starter motor, and all associated components.

Post-Repair Checks and Road Test

Once the mechanical reassembly is complete, several crucial final steps are necessary to ensure a quality repair:

• Gearbox Oil: The gearbox must be replenished with the correct quality and quantity of gearbox oil.
• Electrical Systems: All electrical consumers should be reset after the battery has been reinstalled.
• Road Test: A comprehensive road test is absolutely essential. This allows the technician to verify that the clutch is functioning correctly, that there are no unusual noises, and that the vehicle accelerates smoothly and without slipping. This final step confirms the success of the repair and ensures customer satisfaction.

Common Clutch Problems and Symptoms

A slipping clutch is just one of several issues that can affect a vehicle's clutch system. Understanding the common symptoms can help drivers identify potential problems early:

Frequently Asked Questions (FAQs)

Q1: How long does a clutch replacement typically take?
As seen in this example, the book time is around 5.4 hours. However, the actual time can vary depending on the vehicle model and the technician's experience.

Q2: Can I drive with a slipping clutch?
While you may be able to drive for a short period, it's not recommended. A slipping clutch can cause further damage to other components, such as the flywheel and pressure plate, leading to more expensive repairs. It also compromises your vehicle's performance and safety.

Q3: How much does a clutch replacement cost?
Costs can vary significantly based on the vehicle's make and model, the quality of parts used, and labour rates in your area. It's advisable to get a quote from your local garage.

Q4: Should I replace other components when replacing the clutch?
It is highly recommended to replace the release bearing and slave cylinder (if external) at the same time as the clutch. These components often wear out at a similar rate to the clutch and replacing them preventatively can save on labour costs down the line.

Q5: What is the lifespan of a clutch?
A clutch typically lasts between 50,000 and 100,000 miles, but this can be heavily influenced by driving style and conditions. Frequent stop-start traffic, heavy towing, and aggressive driving can significantly reduce clutch life.

In conclusion, a slipping clutch is a repair that most competent garages can confidently undertake. By understanding the process and the importance of using quality parts and following correct procedures, you can ensure your vehicle receives the best possible care.

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