What are the components that make up a clutch system?

Components of a clutch

1. Flywheel

The flywheel is one side of the vice. It is a big metal disc that bolts directly to the crankshaft. Its role is to:

  • Provide a flat clamping surface for the clutch plate to match up to.
  • Keep momentum, it’s a heavy mass that keeps turning the crank.
  • Take heat away from the clutch plate.

Because the flywheel is bolted directly to the crank, the flywheel will always spin at the same rate as the crank shaft of the engine. (Around the outside of the flywheel you will find a ring gear. Although it is part of the flywheel, ring gears have nothing to do with the clutch itself. They work with the starter motor).

2. Gearbox Input Shaft

A small but very strong shaft. At one end is a locating pin that sits in the centre of the flywheel/crank. A spigot bearing sits in the centre of the flywheel, on the locating pin of the shaft. Because the input shaft is not bolted to the crank, it does not turn with the crank, it just uses it as a locating point.

The opposite end of the shaft is connected to the gearbox. Along the shaft you’ll find gear teeth, called the spline, these match the centre hole of the clutch plate. The gearbox input shaft’s purpose is to:

  • Line up the gearbox with the centre of the crank shaft, keeping the rest of the drive train straight and true to the crank.
  • Give the clutch plate something to locate onto and position itself.

3. Clutch plate

The clutch plate is a disc that slides over the gearbox input shaft. The spline or teeth at the centre of the clutch plate match the teeth of the gearbox input shaft. When the clutch plate slides over the shaft, the matching spline teeth mean the clutch plate is keyed or locked into the gearbox input shaft, and is positioned flat to the flywheel.

Around the outside of the clutch plate, on both sides, there is a hoop of friction material. The friction material riveted to the disc is designed to grip the flywheel. Because of the interlocking spline, the clutch plate and gearbox input shaft will then turn together.

‘When things rub together friction comes into play. In some cases you don’t want friction, so a lubricant is used. In other cases you want the friction and use materials to maximise it to achieve grip. Examples of friction material include brake pads, tyres and the material on clutch plates.’

4. Cover assembly

The cover assembly bolts to the flywheel and OVER the clutch plate. The purpose of the cover assembly is to carry the matching surface (a heavy metal casting) for the flywheel, and a spring loaded system that pushes the casting towards the flywheel. Together the cover assembly and flywheel work just like a vice and work together to clamp down onto the friction material of the clutch plate. When the cover is bolted to the flywheel, its default position is clamped. The vice is tightly clamped onto the clutch plate.

5. Actuation System

To disconnect the clutch, or let go of the torque, you have an actuation system which starts at the pedal and ends at the clutch cover assembly. The Thrust Bearing in a 3 piece clutch kit is one component of the actuation system.

Putting your foot on to the clutch pedal is the same as winding back one side of the vice. When you push onto the pedal, it works a series of connected parts which end with a push onto the spring loaded part of the cover assembly. The spring load is taken off and because the clutch plate is no longer clamped to the flywheel, it stops spinning at the same rate as the crank. It means you have disconnected drive.

Remember the locating pin of the gearbox input shaft is just a locating pin. It will sit in the flywheel, but is not bolted to it so it won’t spin at the same rate.

The Idea in practise

The simplest way is to think of two sides.

One side is the vice that is the flywheel and cover assembly. They are both connected to the crank shaft. They turn together, carrying the engine torque, and work together to clamp onto the clutch plate.

The other side is the assembly that is the clutch plate and gearbox input shaft. Being keyed together, the clutch plate and gearbox input shaft will always turn together.

When the flywheel and cover assembly clamp onto the clutch plate:

  • The friction material grabs.
  • The clutch plate and gearbox input shaft start spinning at the same speed as the flywheel.
  • The torque (turning motion of the engine crank) is now being delivered to the gearbox via the clutch plate and input shaft, therefore the wheels are turning.

What's the difference between a standard and an upgraded clutch?


An OE vehicle comes fitted with a standard clutch. The largest category of clutch sold is standard replacement kits but we’re not all standard drivers. If an engine is modified from standard to improve performance or if the vehicle is under a higher strain than normal (carrying or towing heavy weight) an upgraded clutch might be needed.

Clamp Load

Increasing the clamp load on the cover assembly is a common way to get more torque capacity from your clutch system. It involves increasing the load exerted by the diaphragm to clamp the clutch disc between the pressure plate and the flywheel. The amount of clamp increase is limited as this can make the clutch pedal feel heavy and put strain on the clutch actuation system (hydraulics or cable ect.).

Friction Material

Changing the friction material on a clutch disc can increase the torque capacity and can improve the heat properties. Common clutch disc materials are; Organic – Most commonly used on OE applications this material is great for drivability but is not suited for high performance applications due to poor torque capacity when hot.

Aramid – Generally a mixture of organic and aramid this compound has the drivability of standard organic material with much higher torque capacity and better heat resistance. Found in 4Terrain Ultimate this material is perfectly suited to 4WD applications where higher performance is needed without any compromise to drivability.

Cerametallic/Ceramic - Suited to high performance or race applications this material can handle a high level of heat while also giving a massive increase in torque capacity. Unfortunately, the drivability is significantly decreased as the material gives a more aggressive engagement than organic material. This material can be found in the Mantic performance range.

Increasing surface area

Increasing the size or the surface area of a clutch increases the torque capacity of the system, however unlike brakes you’re generally not able to simply install a larger clutch. There are two methods that are used by performance clutch manufactures to increase the surface area;

Multiple Plates

Installing twin or triple plates in most cases can be done without modifying the bellhousing and can double or triple the torque capacity without having a detriment to the drivability. The Mantic Track series has a range of twin and triple plate kits which feature several different plate options to suit various applications from street to track.

ER2 Groove

This groove is a patented system that has been specifically designed to increase the Mean Effective Radius of the pressure plate and assist in heat removal. The increase in the Mean Effective Radius of the cover assembly gives a significant increase in torque capacity.

By adding the groove to the pressure plate, the inside radius of the friction face has effectively been increased. The first 5/16 inches (7.9375mm) of the pressure plate has all but been removed and added to this, there is progressively less material removed as the radius increases. The net effect of this is to move the effective inside radius further out.

The Mean Effective Radius of the clutch is directly proportional to the torque capacity of the system. Therefore as the Mean Effective radius increases so does the Torque Capacity of the clutch. This system can be found in both the Mantic and 4Terrain performance clutch range.

ER2 Groove

Mantic Torque Capacity Graph

How do I diagnose a fault?

It is important to troubleshoot any faults before replacing the clutch system. Below is a troubleshooting guide for the common faults that occur with clutch systems.

Troubleshooting Guide

How do I install a multi plate clutch?

Every Mantic Track kit comes with a technical guide but if you’ve misplaced yours you can download a copy from this link.

Technical Guide

What sort of quality control does Mantic have?

Every Mantic Track kit is tested against specific specifications before it leaves our manufacturing plant in Melbourne Australia. Every Track kit is signed off by a technician and can be tracked back via a SFI number. This ensures the highest level of quality control. On top of this our manufacturing plant is ISO9001 certified.

What’s a Dual Mass Flywheel (DMF) and Dual Mass flywheel Replacement (DMR)?

A Dual Mass Flywheel (DMF) is comprised of two flywheels that work together with dampening springs to reduce vibrations.

  • - Isolates engine vibrations
  • - Reduces noise
  • - Helps to prevent transmission damage
  • - Improves shifting comfort

Dual Mass Flywheel Replacements (DMR) also known as a Solid Mass Flywheel (SMF) move the damping system from the flywheel to the clutch plate. This returns the flywheel back to a conventional solid mass flywheel.

Advantages (over DMF):
  • - Greater reliability
  • - Better thermal dynamics
  • - Cost efficient: Both on the initial purchase and ongoing with the ability to machine the flywheel.

Note: When a DMR system is fitted can have an increase in drive train noise.

What warranty comes with my Mantic Clutch?

Clutch Industries Pty Ltd (Mantic) warrants all its products to be free of defects in material and workmanship during the warranty period based upon the following terms and conditions;

1.Mantic Stage 1, 2 and 3 Clutch Kits are cover by a 1 year or 20,000 kilometres (whichever occurs first) from date of purchase. Mantic Stage 4, 5 and Track Series Kits (multi-plate) come with a 90-day satisfaction guarantee from date of purchase. All Mantic Stage clutch kits also include a Lifetime Warranty on the cover assembly, more details can be found in section 2 “Limited Lifetime Warranty”.

2.Limited Lifetime Warranty; This guarantee applies to the cover assemblies on all 4Terrain and Mantic Stage branded clutch kits and is only warranted to the original purchaser. It covers defects in the material and workmanship but does not cover normal wear, misuse, alterations and abuse.

3.Clutch Industries Pty Ltd warranty does not cover:

a.Normal wear and tear, including wear and tear of any friction materials forming the surface between the clutch disk and pressure plate or used as a component of the product;

b.Any defect or damage caused by a collision or other accident; c. Any defect or damage caused by the failure to store, handle, install, assemble, maintain or use the product in accordance with Clutch Industries instructions or specifications, including but not limited to: (a) modification of the product by the customer in any way; or (b) installation of the product in a vehicle that is not in full compliance with the instructions and specifications of the manufacturer of that vehicle d. Any defect or damage arising directly or indirectly as a result of racing or competing in the vehicle in which the product is installed e. Any defect or damage arising directly or indirectly as a result of the failure to use and install an appropriate scatter shield

4.Mantic Engineering reserves the option to repair or replace products at no charge if found to be defective during the warranty period.

5.This warranty will be VOID automatically if in Clutch Industries reasonable opinion the product has been subject to any unreasonable use, misuse, negligence, fire, or accident; or the product has been modified, repaired or dismantled without Clutch Industries prior written authorization; or any Clutch Industries part has been replaced with a non- Clutch Industries part. Clutch Industries reserves the right in its sole discretion to inspect, evaluate and test the purportedly defective product in any way deemed







Our goods come with guarantees that cannot be excluded under Consumer Law in your market. Nothing within this policy is intended to circumvent these rights and as such local consumer laws, which may apply to any given market, will be adhered to by CI. CI recognises that subject to local consumer laws, you may be entitled to a replacement or refund for a major failure and for compensation for any other reasonably foreseeable loss or damage. You may also be entitled to have the goods repaired or replaced if the goods fail to be of acceptable quality and the failure does not amount to a major failure


What’s Mantic’s Privacy Policy?

About this Policy

This policy sets out how Mantic a division of Clutch Industries Pty Ltd  collects, uses and discloses your personal information. If you disclose personal information to third parties this policy will not apply and you will be subject to the privacy policy of that third party. By accessing or using the 4Terrain Clutch website, you agree to the collection, use and disclosure of your personal information in the manner described in this policy. Words defined in the 4Terrain Terms and Conditions of Use have the same meaning in this Privacy Policy

Clutch Industries (4Terrain) is bound by the Privacy Act (1988).


Clutch Industries collects personal information to assist it and its related bodies corporate to conduct their activities and provide the range of services they offer. Personal information collected by Clutch Industries may include:

  • identification details, which may include name, birth date, gender, security questions and answers.
  • contact information which may include email address and mobile phone number
  • bank account and credit account details.
  • user IDs and passwords.
  • services provided to you, including saved items and searches
  • business information, such as ABN and license number.
  • information submitted in applying for or requesting a finance or insurance related product.
  • information about the devices on which you visit the Clutch Industries website, and your activities on that and associated sites.
  • third party account details (for example where you sign in through a social network).
  • social profile information.
  • records and content of communications with Clutch Industries or any other person including records and content using Communications Services (as that term is defined in Clutch Industries’ Terms and Conditions of Use).  Please note that such records and content may be stored and scanned by Clutch Industries. and
  • information obtained as a result of your use of our mobile website or application such as geo-locations and unique device identifiers.


Clutch Industries collects personal information in a number of ways, including:

  • directly from you when you provide information directly to Clutch Industries in person, by phone or in writing (whether electronic or otherwise) for example when you purchase an item on one of our websites; or in a contract with your business to provide you with our products or services.
  • directly from you when you communicate with Clutch Industries or any other person using Clutch Industries Communications Services.
  • from third parties such as:
  • Clutch Industries’ related companies; resellers of Clutch Industries services and service providers to Clutch Industries.
  • operators of linked or served web sites, applications and advertising on the Clutch Industries’ website and associated sites.
  • social networks where you choose to share that information when creating an account.
  • third party data providers who have been directed by you to send us information on your behalf.
  • through use of Clutch Industries’ proprietary software in which personal information is stored.
  • from organisations identified or described under the heading "How is personal information disclosed.


  • Your personal information may be used for the following purposes:
  • to maintain appropriate business records.
  • to research, develop, improve and use within Clutch Industries products and services and by its outsourced service providers to provide and improve their services.
  • to pre-populate / customise / provide shortcuts on our websites.
  • to conduct surveys to determine use and satisfaction with Clutch Industries services.
  • to generate statistics in relation to Clutch Industries.
  • for the purposes of feedback, reviews and ratings.
  • to promote and market special offers and other services to you (if you do not want to receive these, please let us know by clicking here).
  • for purposes connected with the operation of the Clutch Industries website.
  • for staff training and quality assurance.
  • to personalise the site experience and / or the advertising you see when you visit the Clutch Industries website or other associated websites.
  • to contact winners of trade promotions run by Clutch Industries


Clutch Industries may disclose personal information to individuals and organisations other than Clutch Industries. The organisations to which we may disclose personal information include:

  • Clutch Industries’ staff and Clutch Industries’ related bodies corporate and their staff
  • the public if you advertise with Clutch Industries or use publicly available Communications Services
  • individuals and organisations that advertise with Clutch Industries if you acquire any products or certain services through Clutch Industries - depending on your purchase these may include.
  • Clutch fitting service providers.
  • transportation service providers.
  • payment services providers.
  • outsourced service providers who assist any of the above persons to provide services.

If you do not want Clutch Industries to disclose your personal information to these individuals and organisations, you should not submit your personal information on the Clutch Industries website or acquire those products or services.

Outsourced service providers who assist Clutch Industries to provide its services including:

  • information technology providers.
  • marketing and market research advisers; and
  • professional advisers; and
  • payment platforms.
  • entities to whom you request we send your information.
  • resellers of Clutch Industries services.
  • organisations involved in a sale/transfer of Clutch Industries’ assets, business or shares
  • to assist government or regulatory authorities or police.
  • as we are required by law, for example pursuant to a subpoena.

Where Clutch Industries provides information to a third party at your request, you acknowledge that your information will be handled by that third party in accordance with its privacy policy and not in accordance with the Clutch Industries privacy policy.


Clutch Industries strives to maintain accurate and up-to-date records. To facilitate this, please let us know if any of your details change. You may update certain personal information through your membership account (if you have one) or contact us at [email protected]. Clutch Industries may destroy or de-identify personal information once the information is no longer deemed required by the business.


You generally have a right to access your personal information, subject to a few exceptions provided by law. If you wish to access your personal information please contact us at  [email protected]. Please remember to provide as much detail as you can as this will help us to find the information. There is no charge for this service, however you may be required to verify your identity before any information is released to you. Please note that depending on the volume or nature of the information required, it may take a number of days to fulfil the request.


Clutch Industries takes reasonable steps to protect personal information collected from misuse, loss, unauthorised access, modifications or disclosure. Your personal information may be stored in hard copy documents, but is generally stored electronically on Clutch Industries’ sales’ systems.


Some of Clutch Industries ' service providers are located outside of Australia, including in the United States of America and Canada. It may be necessary to disclose your personal information to those service providers for some of the purposes listed above. By providing Clutch Industries with your personal information, you consent to the disclosure / transfer of your personal information outside of Australia as set out in this privacy policy.


You may deal with Clutch Industries anonymously by using a pseudonym, unless Clutch Industries is required or authorised by law to deal only with an identified person, or it is impracticable for us to respond to you if you have not identified yourself.


If you choose not to provide personal information when requested, Clutch Industries may not be able to provide you with the full range of Clutch Industries services.


When you visit a website or use an application on the 4Terrain website and associated sites, Clutch Industries records anonymous information such as IP address, time, date, referring url, and other referral information, device information and location, carrier, site interactions such as your access to website features, pages accessed, content, searching activities, lead submission, and files accessed and downloaded, type of browser and operating system.

Such information collected by Clutch Industries may be linked to other information Clutch Industries holds about a user, compiling a complete profile about Clutch Industries users’ browsing activities on the 4terrain website and associated sites.

Clutch Industries may use third party advertising companies to collect data and/or serve ads when you visit the 4Terrain website and associated sites. These companies may use information (not including your name, address, email address or telephone number) about your visits to websites in order to provide advertisements about good and services of interest to you.  If you would like more information about this practice and to know your choices about not having this information used by these companies, visit http://networkadvertising.org

Clutch Industries uses "cookies" and other methods to collect and store the information set out above. A cookie is a small file that stays on your computer until, depending on whether it is a sessional or persistent cookie, you turn your computer off or it expires (this may be as little as 30 days or up 2 years, or longer in some cases). Cookies may be used by Clutch Industries or by service providers engaged by Clutch Industries to provide you with the full range of services it offers, remember your preferences, remember the sites you visit on the Clutch Industries website and associated sites, measure and analyse usage of the Clutch Industries website and associated sites for security. Persistent cookies may be used to identify the sites you visit on the Clutch Industries website and associated sites and to personalise the advertising that you see when you make future visits to those sites or other sites or platforms. Cookie data may be sold, licensed or otherwise provided to third parties for sale via advertising exchanges for this purpose. You may adjust your Internet browser settings to disable cookies. If cookies are disabled Clutch Industries may not be able to provide you with the full range of Clutch Industries services.

The 4Terrain website and associated sites may include links to third party web sites, co-branded web sites and applications and advertising served to the Clutch Industries Website by third parties (Linked Sites). The operators of Linked Sites may collect personal information through the use of cookies and otherwise. Clutch Industries is not responsible for Linked Sites and recommends you read the privacy policy of Linked Sites before disclosing your personal information.


This policy may change over time. All changes will be published on this website.

What is Mantic’s terms of sale?

Terms and Conditions of Sale

The following terms and conditions (the terms) shall be incorporated into every contract for sale and or delivery of product (the goods) by Mantic a division of Clutch Industries Pty. Ltd. to the buyer (the buyer). All quotations given, orders accepted and or credit extended by the seller are subject to these the terms and no agent or representative of the seller has any authority to vary or omit any of these terms unless expressly agreed in writing by a director of the seller.

Before purchasing any of the goods from the seller, the buyer.

  • Agrees that they have read, understood and sort legal advise relating to the terms, warnings and instructions contained in the seller’s current catalogues, technical bulletins and or published technical data (“Documents”); and
  • Agrees that they are themselves, a responsible, competent and appropriately skilled user or reseller of the goods and that they comprehend and understand the dangers of incorrect use, modification of and incorrect installation or assembly of the goods and
  • The seller’s acceptance of the order is subject to these terms and conditions of sale and to any additional terms and conditions that may be contained in the seller’s price lists or quotations pursuant to which the order was given.

Each order for the goods (whether in writing or verbally) which sets out the quantity, price and a description of the goods required, including time, date and address for delivery, placed by the buyer amounts to an offer by it to acquire from the seller in the Order upon these the terms. The seller may, at its discretion, accept an order by doing one of the following within 15 days after the date that the seller receives the order:

  • Deliver the goods to the address for delivery set out in the order; or
  • Provide the buyer an estimated date for delivery.
  • Each order that is accepted by the seller under clause 3 constitutes a separate contract between the seller and the buyer which the parties agree is governed by these the terms. Failure of the seller to accept the order in accordance with this clause 3 will be a rejection of the Order.

The seller may, at its absolute discretion, refuse to sell or supply the goods to the buyer. The seller is not required to give reasons for its refusal.

Any order that has been accepted by the seller may not be reduced or cancelled by the buyer after acceptance by the seller

These terms and conditions of sale (the terms) shall take precedence over any additional or inconsistent terms and conditions contained in the buyer’s order or in the buyer’s request for quotation.

Acceptance of Goods delivered to the buyer shall be deemed to have taken place at the expiration of 3 days from the date of delivery to the buyer. Failure to notify the seller within this period will be deemed to be an acknowledgment by the Buyer that the:

  • Quantities as set out by the invoice are correct; and
  • The goods are of an acceptable quality; and
  • The goods are not damaged and will not be returned.

The buyer may return the goods for credit, but the Seller is not obliged to accept the goods, provided the following conditions are satisfied:

  • The seller’s written approval has first been obtained and the original invoice number and date have been quoted for reference and verified by the seller.
  • The goods have not been used and are received by the seller in their original and resalable condition.
  • The buyer agrees to pay all freight and other charges to return the goods to the seller.
  • The buyer agrees to pay a handling charge of 15% of the invoice value of the goods returned if returned to the seller more than 21 days after the original delivery date.
  • If the goods were procured specially for the buyer or made or supplied according to the Buyer’s specifications then such goods will not be accepted by the seller for credit.
  • Goods may not be returned for credit more than 60 days after the date of delivery