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SACHS useful tip:

Clutch grabs.

Causes of grabbing clutches

If the clutch grabs, the problem may not necessarily lie with the clutch itself. Worn engine mounts or poor engine adjustment can also prevent smooth clutch engagement.

Installing the wrong clutch disk can also cause the clutch to grab.

Therefore, check:

  • Use of correct parts for the vehicle
  • Associated system components / check all parts for wear and correct settings
    • Clutch release system
    • Engine suspension
    • Engine management
    • Deficiencies in the driveline

Causes of grabbing clutches

If the clutch grabs, the problem may not necessarily lie with the clutch itself. Worn engine mounts or poor engine adjustment can also prevent smooth clutch engagement.

Installing the wrong clutch disk can also cause the clutch to grab.

Therefore, check:

  • Use of correct parts for the vehicle
  • Associated system components / check all parts for wear and correct settings
    • Clutch release system
    • Engine suspension
    • Engine management
    • Deficiencies in the driveline

Facings slightly contaminated with oil or grease

Cause:

  • Damaged transmission or engine sealing
  • Excessive grease on the transmission input shaft or pilot bearing
  • Leakage in hydraulic actuation system

Consequence:

  • Even minor traces of oil or grease adversely affect friction values, and thus start-up performance when the clutch is engaged

.

Facings slightly contaminated with oil or grease

Cause:

  • Damaged transmission or engine sealing
  • Excessive grease on the transmission input shaft or pilot bearing
  • Leakage in hydraulic actuation system

Consequence:

  • Even minor traces of oil or grease adversely affect friction values, and thus start-up performance when the clutch is engaged

.

Hub spline damaged

Cause:

  • Transmission shaft and clutch hub forced together during installation

Consequence:

  • Clutch disk moves jerkily on the transmission input shaft.

Comment:

  • May also cause drag.

Hub spline damaged

Cause:

  • Transmission shaft and clutch hub forced together during installation

Consequence:

  • Clutch disk moves jerkily on the transmission input shaft.

Comment:

  • May also cause drag.

Housing deformed

Cause:

  • Attachment screws not professionally tightened during installation. Not tightened in a cross-wise, over-center sequence.
  • Clutch pressure plate not correctly centered in the flywheel

Consequence:

  • Lop-sided pressure plate lift

Comment:

  • Drag may occur if the problem is severe.

Housing deformed

Cause:

  • Attachment screws not professionally tightened during installation. Not tightened in a cross-wise, over-center sequence.
  • Clutch pressure plate not correctly centered in the flywheel

Consequence:

  • Lop-sided pressure plate lift

Comment:

  • Drag may occur if the problem is severe.

Tangential leaf springs deformed (MX clutch pressure plates – VW, Audi, Seat, Skoda)

Cause:

  • Incorrect counter-holding technique, e.g. with a screwdriver, when bolting down clutch pressure plate

Consequence:

  • Lop-sided pressure plate lift

Comment:May also cause drag

Important:

Counter-hold the crankshaft at the front side of the engine with an appropriate wrench.

Tangential leaf springs deformed (MX clutch pressure plates – VW, Audi, Seat, Skoda)

Cause:

  • Incorrect counter-holding technique, e.g. with a screwdriver, when bolting down clutch pressure plate

Consequence:

  • Lop-sided pressure plate lift

Comment:May also cause drag

Important:

Counter-hold the crankshaft at the front side of the engine with an appropriate wrench.

Worn engine / transmission mounts

Cause:

  • Worn components

Consequence:
Leads to pseudo-judder (bonanza effect) in driveline when the clutch engages during start-up.

Comment:

Always check these components for signs of wear.

Worn engine / transmission mounts

Cause:

  • Worn components

Consequence:
Leads to pseudo-judder (bonanza effect) in driveline when the clutch engages during start-up.

Comment:

Always check these components for signs of wear.

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