Introduction:
Some dual mass flywheels (DMFs) made by Hyundai, Mitsubishi, Nissan, Renault, and Volvo are equipped with a locking pin on certain applications. This pin prevents the two masses from colliding with each other, simplifying the factory installation process during production and also serving as a sort of transport lock.
DMF Replacement Procedure with Locking Pin:
When replacing a DMF with a locking pin, care must be taken not to remove the locking pin, as this may cause fragments or debris to fall into the DMF, resulting in damage. The locking pin has a predetermined breaking point, which breaks when the vehicle is first started. From this point on, the DMF is fully functional. The locking pin fragments remain firmly in their original installed position.
If the DMF lockup is misdiagnosed as a malfunction, it is important to avoid any attempt to drill out the lockup pin to make the DMF "work normally," as this may cause damage to the DMF.
Conclusions In conclusion, replacing a DMF with a locking pin requires paying special attention to the presence of the pin itself and avoiding any attempt to remove it. Using a DMF with a locking pin does not affect the performance of the vehicle and allows for a simplified factory installation and transportation process. Workshops and mechanics must be informed about the details of the DMF with a locking pin and its proper handling to avoid damage to the vehicle.
