User Guide

 DMF failure diagnosis
Installation
What should be considered when installing a DMF?
• Observethespecicationsofthevehiclemanufacturer!
• Checktheshaoilseals(engineandtransmissionside)
for oil leaks and replace, if necessary.
• Checkstarterringgearfordamageandtightt.
• Alwaysusenewxingbolts.
• Verifythatthedistancebetweenthespeedsensors
and the DMF sensing pins/sensor ring is correct
This varies depending on the vehicle make.
• Ensurethedowelpinsarettedcorrectly.
Dowel pins must not be forced into or pushed out of
the DMF.
Dowel pins forced further into the DMF may score the
primary mass (noise).
• Useaclothdampenedwithsolventtocleanthecontact
surface of the DMF.
Nosolventmustpenetratetheinterior!
• Ensureyouuseclutchboltsoftherequiredlength.
Bolts which are too long may scrape on the primary
flywheel (noise) or block it completely. In addition,
the ball bearing may be damaged and displaced from
its seating.
Always check the DMF when replacing the clutch. A worn
and defective DMF can damage the newly installed clutch.
In the event of a customer complaint, targeted questions
help to identify the fault.
• Whichcomponentisnotworking,whatisthecustomer’s
complaint?
• Whendidthisproblemrstoccur?
• Whendoestheproblemmanifestitself?
From time to time, oen, always?
• Underwhichoperatingconditionsdoestheproblem
occur?
E.g. while driving o, accelerating, shiing up/down,
when the vehicle is cold or at operating temperatures?
• Istheenginediculttostart?
• Whatisthetotalandannualmileageofthecar?
• Arethereextraordinaryloadconditionsunderwhich
the vehicle operates?
E.g. towing a trailer, overloading, taxi, fleet vehicle,
driving school, is it chip tuned?
• Drivinghabits?
City trac, short-/long-distance driving, motorway
driving?
• Havetheclutchandtransmissionrequiredanearlier
repair?
If yes, at what mileage and for what reason?
General vehicle inspection
Check the following prior to proceeding with the repair:
• Controlunitfaultcodes(engine,transmission)
• Batterypower
• Conditionandfunctionofthestartermotor
• Tunedengine(chiptuning)?
How to handle the DMF correctly
The following instructions provide important information
on the correct handling of the DMF.
• ADMFthathasbeendroppedmustnotbeinstalled!
Risk of damaged ball or plain bearing, distorted sensor
ring, increased imbalance.
• Remachiningofthefrictionsurfaceisnotpermissible!
Weakening of the friction surface will result in
insucient burst speed characteristics.
• IntheDMFwithplainbearings,thesecondarymass
must not be moved with excessive force (i.e. with a
leverorscrewdriver)inanaxialdirection!
• ItisnotpermissibletocleantheDMFinapartswashing
machine, or to use high-pressure cleaners, steam
cleaners, compressed air or any cleaning sprays.
. General advice on inspecting the DMF
5 DMF failure diagnoses