Important! Thinking Of Changing A Verto Clutch?
Posted 11 October 2007 - 06:02 PM
A short explanation of the current problem
It is becoming more and more apparent that problems with Verto Clutches failing is as a result of the wrong torque setting being applied to the taper boss to pressure plate retaining bolts. Failures can be partial or total with the bolts shearing off, or just plain falling out.
Here are some of the most recent
NOTE:This refers to the taper boss, or flywheel hub, of 2 part flywheels NOT the pressure plate, diaphragm or clutch cover to flywheel bolts
These failures are as a result of the taper boss being 'no longer available, NLA'. Clutch kits are now supplied without this taper boss. New bolts are usualy supplied, if they are not, take the kit back and buy a kit that does supply the bolts. These bolts may or may not have thread lock applied.
This is where the confusion arises. There is no well documented torque setting for these bolts, both the Haynes and the Rover workshop manual do not list a torque setting for these bolts as at the time of writing, clutches were supplied as a complete assembly from the factory, thus no need to assemble dissassemble. Only in recent years is it the case that the clutch kits are supplied 'incomplete'. However, what people do assume, is that the torque figure listed, 18lbft, for the pressure plate to flywheel bolts ( the bolts around the perimeter of the flywheel) is the correct figure. Its not, it is no where near enough to generate the clamping force to prevent the the whole flywheel assembly from moving on the taper boss. High shear loads are directly applied to the bolts acting like a big pair of bolt cutters. Alternatively, the bolts shake loose as they have been supplied without thread lock applied and none has been used at the time of assembly, the 18lbft torque value again is not enough to prevent the bolts from working loose.
I in the past have used 45lbft, but recently a member on this forum said he spoke to Minispares and they quoted 40lbft. in which case, the correct torque figure for the taper boss to pressure plate bolts is 40-45lbft . Also, if the bolts do not have thread lock applied, use some loctite. Do not install them without thread lock.
Posted 26 October 2007 - 05:01 PM
Posted 05 July 2008 - 07:13 PM
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