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Using the vehicle selector to the right will present you with the correct selection of parts relevant to your specific vehicle.

Dual Mass Flywheel Diagnostics
Problem: Damper springs or nylon spacers are failing on the engine side of the DMF after short service life.

Solution: Service diesel engine. Correct bad fuel injectors, poor engine compression, etc. Make sure engine idle is set to factory specifications. Important: Changing the turbo boost will change the torsional frequency of the engine, which can damage the DMF!

PFP will not honor warranty on DMF's with broken damper springs.
PFP will not honor warranty on vehicles with altered turbochargers.
Problem: Clutch slips after short service life.
Solution: Check the friction ring between the inner and outer halves of the DMF. This check should be made with the DMF installed and the clutch and bell housing removed.

Partially insert two pressure plate bolts on opposite sides of the DMF's pressure plate bolt holes.

Block the engine so that it cannot turn.

Place a pry bar between the two pressure plate bolts. Try to rotate the outer portion of the DMF relative to the inner portion. It does not matter if you pry it clockwise or counter-clockwise.

Note: all DMF's have about ten degrees of free rotational movement before the friction ring engages. You will be checking for movement after the initial play is taken up.

If the outer half of the DMF will rotate with hand pressure on the pry bar, the DMF friction ring is worn out. The DMF will slip and must be replaced.

The friction ring is designed to protect the transmission against torsional engine spikes. PFP will not honor warranty on DMF's with worn friction rings.


Problem: DMF Center bearing fails after short service life.
Solution: Check the DMF for missing dowel pins. Failure to use the OEM dowel pins will set up a vibration that will destroy the center bearing. Also, check the DMF friction surface for heat checks and/or heat spots. Check the pressure plate for hot spots and the disc friction material separation. Both are signs that the truck is being used beyond it's rated capacity and/or the clutch is not releasing properly due to a worn or faulty hydraulic clutch release system. The DMF is designed to protect the transmission. It is designed as a wear component and will fail if OEM vehicle capacity is ignored.
PFP will not honor warranty DMF's with missing dowel pins.

Problem: DMF pilot bearing fails after short service life.
Solution: Check the transmission input shaft pilot-bearing surface. If this surface is scored or otherwise damaged, the shaft must be repaired or replaced. Failure to properly repair or replace a bad transmission input shaft would ultimately result in failure of the DMF.