Diagnosing a Slippping Clutch

Updated on May 2, 2019
Dan Ferrell profile image

Dan Ferrell writes about do-it-yourself car maintenance and repair. He has certifications in automation and control technology.

A clutch assembly.
A clutch assembly. | Source

A slipping clutch may show one or more of the following symptoms:

  • No engine power: You notice engine poor performance when power is required as you drive uphill or pull a trailer.
  • Fast clutch pedal action: Once the clutch disc begins to wear down and slip, you'll notice that pressing the clutch pedal lightly is all you need to engage or disengage the clutch.
  • Burning odor: This odor comes from the friction material on the clutch disc rubbing against the flywheel and pressure plate. Instead of grabbing, the clutch facing slips, rising its temperature.
  • High engine speed: You notice that engine revs high when shifting gears or going uphill.

It's a good idea to pay attention to these symptoms and diagnose the problem as soon as possible. A clutch slipping will eventually prevent your engine from transferring rotating power to your driving wheels and leave you stranded in the middle of the road.

A slipping clutch may appear on:

  • high mileage engines
  • vehicles driven mostly in heavy traffic
  • non-self-adjusting systems that require periodic maintenance
  • vehicles with a newly installed clutch

The next sections briefly explain how the clutch works, what is a slipping clutch, what are the main causes for it, and an easy test you can apply at home to diagnose a potential slipping clutch.

A standard clutch disc.
A standard clutch disc. | Source
1. How the Clutch Works
2. What is Clutch Slippage?
3. What causes clutch slippage
4. Clutch Slippage Test
5. A Slipping Clutch is a Warning Sign

1. How the Clutch Works

The clutch disc mounts on the transmission input shaft. It is located between the flywheel and the pressure plate. The flywheel is mounted on the engine's crankshaft, while the pressure plate is attached to the flywheel.

It is the rotating movement of the flywheel and pressure plate that transmits rotating power to the transmission when the clutch disc is pressed between the flywheel and pressure plate.

The friction material on the clutch face allows the clutch to grab to the flywheel and pressure plate to do its job. When the clutch's friction material is too worn, or a mechanical problem prevents the pressure plate and flywheel to grab onto the clutch disc, a clutch-slippage condition develops. Watch the video above to get a much better visual reference for how the clutch operates.

A clutch pedal in need of adjustment may cause clutch slippage.
A clutch pedal in need of adjustment may cause clutch slippage. | Source

2. What is Clutch Slippage?

Basically, a slipping clutch happens when you depress the accelerator, the engine revs up, but the car hesitates to move. Your vehicle may move slowly through some gear ranges too, depending on the severity of the problem. You may feel the clutch slipping:

  • as you accelerate from first gear
  • during driving in higher gears.
  • going uphill or while pulling a trailer

Clutch slippage is a safety issue, and it can lead to a serious road accident.

3. What causes clutch slippage

External or internal mechanical problems can lead to a slipping clutch.

External issues may include:

  • Cable or linkage system problems like binding, broken or bent parts in the assembly.
  • Clutch in need of adjustment (throw out bearing pushing against the pressure plate).
  • Rust, damage, or misalignment causing binding in the release mechanism.
  • Damaged motor mount: Under load, engine movement can push against the clutch release fork, or cause clutch linkage to bind.
  • Leaking master cylinder or slave cylinder on a hydraulic system type (the clutch may also fail to disengage and the pedal may become soft).

Internal issues may include:

  • Clutch disc worn out.
  • Clutch disc contaminated with oil (oil seal leaking).
  • Worn flywheel surface.
  • Weaken-worn out pressure plate diaphragm springs.
  • Leaking front transmission seal (main input shaft).

Inspect first for external problems that might be affecting the release mechanism. If everything seems to be fine, then you may need to drop the transmission to check the clutch assembly.

Damaged engine mounts can also lead to clutch slippage.
Damaged engine mounts can also lead to clutch slippage. | Source

4. Clutch Slippage Test

Often, you can tell the clutch is slipping just by driving the car around and engaging the different gears. If you have a repair manual for your car model, you may find a testing procedure for your particular configuration. But you can also apply these general steps.

First, check clutch pedal play:

  1. Position a tape measure or ruler next to the clutch pedal. The end of the ruler should rest on the floor.
  2. Push the pedal with your hand, just enough to take out pedal slack.
  3. If the pedal moves between one and two inches, pedal play is within an acceptable range. Continue with the following steps; if you feel there's little pedal play, you may need to manually adjust the clutch, or the clutch has worn out and you need to replace it. If necessary, consult your vehicle repair manual.

If you don't have the manual, you can buy an aftermarket copy through Amazon. Haynes manuals come with step-by-step procedures for many maintenance, parts replacement, and troubleshooting tasks. So you'll save a lot of money by doing many of these projects at home.

Check clutch for slippage:

  1. Find a safe, level place to park your vehicle with plenty of space in front of it to allow your car to move forward, if necessary.
  2. Engage the parking brake.
  3. Start the engine and let it idle.
  4. Fully depress the clutch pedal to disengage the clutch.
  5. Shift your transmission into third gear.
  6. Accelerate the engine up to 2000 rpm.
  7. Slowly release the clutch pedal to allow the clutch to engage.

    • The engine should stall as soon as the clutch is fully engaged (locks up).
    • If the engine runs for a few seconds before stalling, the clutch could be partially slipping.
    • If the engine continues to run after releasing the clutch pedal, the clutch is slipping.
  8. Shut off the engine three to four seconds after fully releasing the clutch pedal to prevent damage to the pressure plate or flywheel.

A worn out clutch disc may cause slippage.
A worn out clutch disc may cause slippage. | Source

5. A Slipping Clutch is a Warning Sign

Clutch slippage is a safety issue, and it can lead to a serious road accident. Take your slipping clutch as a first warning sign. Eventually, your vehicle will stop moving, perhaps in the middle of the road, once the flywheel and pressure plate are unable to grab onto the clutch disc.

If you followed the test steps described here, and you suspect a slipping clutch, have the clutch diagnose by a qualified shop and, if necessary, install a new clutch kit.

Driving a vehicle with a slipping clutch can cause a serious accident.

This content is accurate and true to the best of the author’s knowledge and is not meant to substitute for formal and individualized advice from a qualified professional.

Questions & Answers

  • I have a 2012 VW Beetle turbo, 6 speed, 164k mileage. In 6th (and now 5th) gears driving on the highway, if I step on it I get a little jerking hesitation. If I feather it, it drives fine. It’s fine in 1-4 gears. No noises or abnormal behaviors. How can I repair my VW Beetle?

    There could be several reasons for this: a clogging fuel filter (make sure you've replaced the filter at the recommended schedule - consult your owner's manual); a slipping clutch caused by wear; a faulty flywheel can also cause this, and the symptoms may spread to other gears eventually.

    Also, make sure you are not dealing with misfires. Check for trouble codes, even if the engine light is not on. There could be pending codes that can help diagnose the issue.

© 2019 Dan Ferrell


    0 of 8192 characters used
    Post Comment
    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      8 months ago

      Check the clutch master cylinder or hydraulic system.

    • profile image


      8 months ago

      I have a 2002 honda accord manual trans while the engine is running I can put it in any gear freely without the clutch and vehicle doesnt move ither no noises what could be the problem


    This website uses cookies

    As a user in the EEA, your approval is needed on a few things. To provide a better website experience, axleaddict.com uses cookies (and other similar technologies) and may collect, process, and share personal data. Please choose which areas of our service you consent to our doing so.

    For more information on managing or withdrawing consents and how we handle data, visit our Privacy Policy at: https://maven.io/company/pages/privacy

    Show Details
    HubPages Device IDThis is used to identify particular browsers or devices when the access the service, and is used for security reasons.
    LoginThis is necessary to sign in to the HubPages Service.
    Google RecaptchaThis is used to prevent bots and spam. (Privacy Policy)
    AkismetThis is used to detect comment spam. (Privacy Policy)
    HubPages Google AnalyticsThis is used to provide data on traffic to our website, all personally identifyable data is anonymized. (Privacy Policy)
    HubPages Traffic PixelThis is used to collect data on traffic to articles and other pages on our site. Unless you are signed in to a HubPages account, all personally identifiable information is anonymized.
    Amazon Web ServicesThis is a cloud services platform that we used to host our service. (Privacy Policy)
    CloudflareThis is a cloud CDN service that we use to efficiently deliver files required for our service to operate such as javascript, cascading style sheets, images, and videos. (Privacy Policy)
    Google Hosted LibrariesJavascript software libraries such as jQuery are loaded at endpoints on the googleapis.com or gstatic.com domains, for performance and efficiency reasons. (Privacy Policy)
    Google Custom SearchThis is feature allows you to search the site. (Privacy Policy)
    Google MapsSome articles have Google Maps embedded in them. (Privacy Policy)
    Google ChartsThis is used to display charts and graphs on articles and the author center. (Privacy Policy)
    Google AdSense Host APIThis service allows you to sign up for or associate a Google AdSense account with HubPages, so that you can earn money from ads on your articles. No data is shared unless you engage with this feature. (Privacy Policy)
    Google YouTubeSome articles have YouTube videos embedded in them. (Privacy Policy)
    VimeoSome articles have Vimeo videos embedded in them. (Privacy Policy)
    PaypalThis is used for a registered author who enrolls in the HubPages Earnings program and requests to be paid via PayPal. No data is shared with Paypal unless you engage with this feature. (Privacy Policy)
    Facebook LoginYou can use this to streamline signing up for, or signing in to your Hubpages account. No data is shared with Facebook unless you engage with this feature. (Privacy Policy)
    MavenThis supports the Maven widget and search functionality. (Privacy Policy)
    Google AdSenseThis is an ad network. (Privacy Policy)
    Google DoubleClickGoogle provides ad serving technology and runs an ad network. (Privacy Policy)
    Index ExchangeThis is an ad network. (Privacy Policy)
    SovrnThis is an ad network. (Privacy Policy)
    Facebook AdsThis is an ad network. (Privacy Policy)
    Amazon Unified Ad MarketplaceThis is an ad network. (Privacy Policy)
    AppNexusThis is an ad network. (Privacy Policy)
    OpenxThis is an ad network. (Privacy Policy)
    Rubicon ProjectThis is an ad network. (Privacy Policy)
    TripleLiftThis is an ad network. (Privacy Policy)
    Say MediaWe partner with Say Media to deliver ad campaigns on our sites. (Privacy Policy)
    Remarketing PixelsWe may use remarketing pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to advertise the HubPages Service to people that have visited our sites.
    Conversion Tracking PixelsWe may use conversion tracking pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to identify when an advertisement has successfully resulted in the desired action, such as signing up for the HubPages Service or publishing an article on the HubPages Service.
    Author Google AnalyticsThis is used to provide traffic data and reports to the authors of articles on the HubPages Service. (Privacy Policy)
    ComscoreComScore is a media measurement and analytics company providing marketing data and analytics to enterprises, media and advertising agencies, and publishers. Non-consent will result in ComScore only processing obfuscated personal data. (Privacy Policy)
    Amazon Tracking PixelSome articles display amazon products as part of the Amazon Affiliate program, this pixel provides traffic statistics for those products (Privacy Policy)
    ClickscoThis is a data management platform studying reader behavior (Privacy Policy)