User Guide
Description and shipment of the DMF special tool
6 Description and shipment of the DMF special tool
a workshop environment. The freeplay angle is the angle
at which the DMF’s primary and secondary masses can
be rotated against each other until load is exerted on the
arc springs. Tilting clearance occurs when the rotating
masses of the DMF are tilted towards or away from one
another.
A 100% functional test includes, among other things,
testing the characteristics of the arc springs in the DMF
during compression. The testing must be performed
at a special test facility as it cannot be carried out with
standard workshop equipment. However, the LuK DMF
Special Tool 400 0080 10 allows you to perform the most
important measurements – freeplay angle and rock – in
If in doubt, always replace the DMF along with the
clutch. Further information on the design, function and
failure diagnosis methods of a DMF can be found in
the LuK technical brochure and on the DVD “Dual Mass
Flywheel – Technology & Failure Diagnosis”.
In addition, your assessment of the DMF’s operational
reliability should be based on the following criteria:
• Greaseleakage
• Conditionofthefrictionsurface(e.g.signsofthermal
load/thermal cracks)
• Noisebehaviour
• Conditionoftheclutch
• Loadingconditionofthevehicle(towingatrailer,driving
school, Taxi, etc.)
Item no. 400 0080 10