Clutch & gearbox questions

How do I know if my clutch is going?

The warning signs of a worn clutch — slipping, a high biting point, burning smell, judder and heavy pedal — and which ones are cheaper faults, from a Manchester clutch specialist.

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The clearest sign is slipping: the engine revs rise but the car does not speed up to match, especially in higher gears or uphill. A biting point near the top of the pedal, a burning smell, judder pulling away or a heavy pedal are other common signs. Some of these are cheaper hydraulic or flywheel faults, so get it diagnosed first.

What does a worn clutch feel like?

A clutch wears gradually, so most drivers adapt without noticing until it starts to slip. Slipping shows up first when the clutch is under the most load: accelerating hard in fourth, fifth or sixth, overtaking, pulling away uphill or carrying a heavy load. The revs climb but the road speed does not follow.

As the friction material thins, the point where the clutch bites moves up the pedal travel. A biting point right at the top of the pedal is a common sign of a plate near the end of its life — although a hydraulic fault can cause the same feel.

Which symptoms are not the clutch itself?

Not everything that feels like a worn clutch needs a new clutch. A pedal that goes to the floor with no resistance is usually hydraulic — a master or slave cylinder or a leak — rather than the friction plate. A heavy or stiff pedal can be the pressure plate, but also a cable or hydraulic fault.

A rattle at idle that changes or disappears when you press the pedal usually points at the dual mass flywheel rather than the clutch. Crunching into every gear can be the clutch not fully disengaging, which is far cheaper than a gearbox fault.

Is there a simple test I can do?

Somewhere safe and legal, with the handbrake firmly on and the engine at idle, select third or fourth gear and slowly raise the clutch. A healthy clutch will stall the engine almost immediately. If the engine keeps running with the pedal fully up, the clutch is slipping.

Only do this briefly — holding a slipping clutch generates heat. If it fails the test, book it in rather than repeating it.

What should I do next?

Get it road tested and inspected before you agree to any work. We road test first, check the hydraulics and mounts, and tell you whether it is a repair or a replacement, with a fixed price either way. If it is the clutch, we measure the flywheel with the gearbox out and only replace it if it is outside tolerance.

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Answers

Related questions

Usually slipping under load — revs rising without the car accelerating to match, most noticeable in higher gears or uphill — or a biting point that has crept up towards the top of the pedal.

It is usually hydraulic rather than the friction plate: a master or slave cylinder, or a fluid leak. That is a repair rather than a full clutch replacement.

A hot, acrid smell after a hill start or heavy traffic is often the clutch slipping and overheating. If it happens regularly rather than once, get it checked.
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