Clutch fault diagnosis

The right information is imperative to workshop profitability, say experts

Clutch fault diagnosis
Contact the First Line Group for a copy of the Borg & Beck fault diagnosis chart.

Clutch specialists Borg & Beck has produced a clutch fault diagnosis chart to highlight the issues that can result from incorrect clutch fitment, helping garages to avoid problems and retain business profit and customer satisfaction.

Using the chart to recognise the symptom, technicians can identify the cause, its effect and the remedy and therefore prevent costly installation problems before they occur.


Release bearing not lubricatedTo ensure the correct operation and maximise service life, the correct quantity and formulation of grease is crucial, which is why all Borg & Beck clutch kits contain a sachet of grease that ticks both quality and quantity boxes.

Without any grease on the bearing guide tube or in the bearing recess, the bearing bore will become scored and the clutch action jerky, with heavy pedal feel.

Incorrect Spline GreaseRemedy: Ensure that the grease is applied to the bearing guide tube or the groove on a new bearing is filled with good quality, high melting point grease. If necessary, also renew the bearing guide tube.

The wrong grease on the driven plate splines will lead to clutch drag due to dirt contamination of the splines.

Remedy: Thoroughly clean the first motion gearbox input shaft and apply a smear of approved grease and renew the driven plate.

Worn bearing guide tubeThe incorrect lubrication on the bearing guide tube will also cause jerky clutch action and a heavy pedal.

Remedy: Replace the worn guide tube and lightly lubricate it with the approved grease.


Broken spring fingersWhen the cover assembly is not located correctly on the flywheel or the bearing over travels, which allows the spring fingers to come into contact with the driven plate and break off.

Remedy: Ensure that the release mechanism, including the auto adjuster is working correctly and replace the complete clutch and any other damaged parts, before re-setting it properly.

Another effect of an incorrectly located cover assembly is vibration and clutch drag

distorted cover mounted flangeRemedy: Check the flywheel dowels for damage and if they are okay, correctly fit a new cover assembly.

If the driven plate is fitted the wrong way round, the clutch could be completely inoperative and damage will result.

Remedy: Replace the driven plate assembly and install it in the correct direction, while also checking for damage, and if necessary replacing, the cover assembly.

damaged driven plateClick ‘More Details’ below to view the Borg & Beck clutch fault diagnosis chart.

For more information about the products available from the First Line Group call 01869 248484.

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