Clutch Kits
A clutch is a mechanical device used to provide an interruptible connection between the engine and the manual transmission or transaxle. It is a key element in the transmission system and is located between the back of the engine and the front of the transmission.
A clutch assembly consists of many parts, but here are the major components:
This is a set of interrelated components that allow the operator to control the clutch. It consists of the clutch fork, clutch pedal assembly, cable or hydraulic circuit and a mechanical linkage.
There are currently two types of clutch release mechanism:
Manual
The manual clutch release mechanism is divided into two categories.
A clutch linkage mechanism – this mechanism uses rods and levers to transfer motion from the pedal to the fork. Movement of the pedal shoves the pushrod on the bell crank causing the bell crank to reverse the forward movement of the clutch pedal.
The cable mechanism – this mechanism uses a steel cable to transfer clutch pedal action to the clutch fork. The cable is usually connected to the clutch fork with the other end of the cable fastening to the upper end of the clutch pedal.
Hydraulic
A hydraulic mechanism uses a hydraulic circuit to transfer pedal movement to the clutch fork. It is made of a master cylinder, a slave cylinder, and hydraulic lines. When the pedal is pressed, hydraulic pressure is created in the master cylinder, actuating the slave cylinder. This forces the slave cylinder to move the clutch fork.
The clutch fork, also known as a release arm or clutch arm, is the heart of clutch operation. It transfers motion from the release mechanism to the clutch release bearing and pressure plate. The clutch fork protrudes through a square hole in the bell house. It features a rubber boot which is designed to keep dirt and debris from entering the clutch housing.
The release bearing, also known as the throw-out bearing, is connected to one of the clutch fork mechanism and rides on the diaphragm spring. It either pulls or pushes the pressure plate diaphragm spring to connect or disconnect the grip of the pressure plate on the clutch disc when the pedal is pressed or released. The bearing also reduces pressure between the release fork and the pressure plate levers.
There are two major types of bearings:• Hydraulic bearings - these types of bearings operate on hydraulic pressure produced by a master cylinder. Hydraulic bearings are easy to install and provide maximum reliability as they don't use a slave cylinder and the stock mechanical bearing.• Manual bearings – the manual throw-out bearing snaps over the end of the clutch fork. The movement of the clutch fork causes the bearing to slide along the transmission hub sleeve.
The clutch disc is fixed between the pressure plate and the flywheel providing a connecting link between the transmission and the engine. It is made of friction material on both sides that make/break contact with the pressure plate surfaces and the flywheel. This friction surface allows for smooth engagement and disengagement.
Clutch discs are categorised as wet or dry systems. Wet clutch discs are immersed in engine oil which keeps the surfaces clean. They offer smoother performance and tend to have a long, service-free life. Dry clutches, on the other hand, are not bathed in a lubricating fluid and use friction to engage the performance clutch.
This component is connected to the engine's crankshaft. Its face is made of iron and is precision machined to a smooth surface. Flywheels provide a mounting surface for the clutch cover and store and release energy pulses from the crankshaft.
This spring-loaded device is bolted to the clutch flywheel. Its main function is to engage and disengage the flywheel and the clutch disc. There are two types of pressure plates:
• The diaphragm type - this pressure plate uses a diaphragm spring to hold the clutch assembly together. The diaphragm spring is a round, conical disc of spring steel. Its pie-shaped segments run from the outer edge to the centre and provide clamping force against the pressure plate.• Coil spring type – the coil spring type uses several small coil springs instead of a single diaphragm spring. This type of pressure plate has release levers hinged inside the plate to move the face of the pressure plate away from the flywheel and the clutch disc. It also has small clip-type springs that fit around the release levers and a cover that holds the assembly together.
Okay, this is where things get tricky – the price to replace clutch components varies *wildly* depending on your car (make and model), location, and whether you do it yourself or go to a shop. Generally, parts alone for a complete clutch kit (disc, pressure plate, throw-out bearing) can range from $200-$800.
Labor is the big cost. Expect anywhere from 4-10 hours of labor at a shop rate of $100-$150/hour. That puts the total labor cost between $400 and $1500. So, a professional clutch replacement could easily be $600 to $2300 or more.
If you’re comfortable with mechanical work and have the right tools, doing it yourself can save significant money – but only if you know what you're doing! A failed DIY clutch job can get *very* expensive.
The clutch is more than just an on/off switch for engine power. It has four key jobs: first, it connects and disconnects the engine from the transmission, allowing you to start and stop without stalling. Second, it transmits torque – that’s the rotational force – from the engine to the drivetrain.
Third, it allows smooth gear changes. Without a clutch, slamming gears would grind them apart! The brief disengagement lets everything synchronize before re-engaging. And fourth, it dampens vibrations and shocks from the engine, protecting the transmission components.
Think of it like this: the engine is always spinning, but the clutch controls *when* that power reaches the wheels. It’s a crucial part of managing your vehicle's movement.
Let's be honest, if your clutch is failing after years of use, it’s likely other components are worn too. Replacing *just* the clutch disc can save money upfront, but you risk premature failure and more labor costs down the line.
I always recommend replacing the pressure plate, release bearing, and pilot bushing/seal along with the disc. The pressure plate's springs weaken over time, affecting clamping force. The release bearing is under constant stress and will likely fail soon after a new clutch install. And that pilot bushing guides the transmission input shaft—it’s cheap to replace while you’re in there!
Don’t forget to resurface or replace the flywheel if it's scored or warped. A bad flywheel surface *will* ruin your new clutch quickly. It's worth the extra cost for peace of mind.
A clutch is essentially the link between your engine’s power and your wheels, letting you smoothly engage and disengage that connection. Key parts include the flywheel (bolted to the engine), the pressure plate (spring-loaded against the flywheel), the clutch disc (with friction material on both sides), a release bearing, and an operating mechanism—either cable or hydraulic.
When you press the clutch pedal, it disengages the pressure plate from the clutch disc. The engine can then spin without transferring power to the transmission. Releasing the pedal re-applies pressure, grabbing the disc and sending power through your drivetrain. It’s a controlled slipping of surfaces—friction is *essential* but wear happens over time.
Think of it like two spinning plates. When you press the clutch, you separate them. When you release it, they rub together to transfer motion. That friction creates heat, so proper lubrication and quality materials are vital for long life.
