This months top three topics straight from our technical hotline team
Hot Topic One
BMW - Self Adjusting clutch (SAC). Unlike the mainstream SAC, BMW has a design which means the compression tool is not required - the pressure plate is already compressed and secured by a clamp. The main thing to remember is do NOT remove the clamp until the clutch has been bolted tightly to the Dual Mass Flywheel (DMF). It's possible subsequently to slacken the cover bolts a little bit in order to centralise the drive disc. Alternatively, use the BMW mandrels, some types of which are contained within special tool kit 400023710.
Hot Topic Two
Vauxhall - Concentric Slave Cylinder (CSC) leakage. CSC failure is always traumatic because the transmission has to be removed in its entirety in order to gain access. We get lots of calls in relation to Vauxhall cars and repeat CSC failure. Invariably the cause is either because there is a trapped seal within the hydraulic supply line or that the clutch height/flywheel depth are not compatibale i.e 'wrong parts'. To avoid both problems, first carefully read the non verbal diagram which accompanies relevant CSC products. This will draw your attention to the location and disposal of a 'top hat' seal which has now been replaced by an 'o' ring. Secondly, following the bolt down of the clutch, check diaphragm finger height. The fingers should remain flat and level. If the fingers bend in or out this indicates potential problems such as non compatibility.
Hot Topic Three
Dual Mass Flywheel (DMF) and clutch pairing. It is often the case that a DMF and a clutch have to be paired by the manufacturer. The simplest way to do this is to look on the catalogue and search for the DMF first. We will often then provide the clutch number i.e 'only in connectino with.....'