Diagnosing a Dual Mass Flywheel

An Overview of Diagnosis Techniques for Dual Mass Flywheels

Dual Mass Flywheels (DMF) are a complex and easily damaged part. If your customers are dealing with potential DMF-related issues, it is essential to determine whether the DMF is the problem. In this 24-minute free webinar, we will give you a comprehensive overview of DMF-related problems and how to diagnose and deal with them.

We will quickly review what a Dual Mass Flywheel is and go over the components inside and the role of each part. We’ll give a technical explanation of how the different components work together in a properly functioning DMF. This brief overview will help refresh your knowledge of a properly functioning DMF so you can better understand how they fail. 

We will give you our recommendations for checking Dual Mass Flywheels, including what to check every time and why you should avoid using a damaged DMF with a new clutch. We’ll explore the disastrous consequences of using chip tuning on a DMF clutch, and you’ll learn whether it is ok to install a DMF which has been dropped. We’ll also provide step-by-step recommendations for installing a new DMF.

We will explore common customer complaints and will provide you with targeted questions about when the problem began to help you in your diagnosis. You’ll discover several common noise complaints to quickly identify whether a noise is a Dual Mass Flywheel failure symptom or something else. We’ll also provide several examples of Dual Mass Flywheel failure, including which part is the cause of the problem, what is the reason for the damage, and how the DMF is defective. You’ll see images of damaged parts to identify them better and understand the true cause of the defect. 

We will briefly go over the steps of a Dual Mass Flywheel test to measure the free play and tilt. You will discover what tools you need and where you can learn how much play & tilt is acceptable before a DMF needs to be replaced. We’ll show you images of each step and tell you what to look out for in a damaged part. For a more detailed walkthrough, we invite you to watch our free webinar on how to check whether DMFs are within tolerance.

Valeo produces an array of car clutch replacement parts, including Dual Mass Flywheels and the Kit4P conversion clutch kit. Contact our hotline to speak with an expert if you have any questions about Valeo Dual Mass Flywheels or other Valeo clutch parts. 

Visit the Valeo Tech@ssist part finder portal to find a specific clutch part by model, part number, or VIN. You will find other free DMF-related training in Tech@ssist, like the webinar called Should Dual Mass Flywheels be Reconditioned or the Pendulum Dual Mass Flywheel.

In this webinar, you will learn:

• What is a Dual Mass Flywheel and how it works
• Recommendations for handling, inspecting, and repairing DMFs
• Dual Mass Flywheel Failure Symptoms
• Which noises are caused by faulty DMFs are which are not
• How to control free play & tilt in a DMF

After the webinar, you can download technical service bulletins on testing a DMF for wear, signs a worn DMF has caused a clutch failure, and DMF storage and transportation guidelines.

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