Powershift Transmissions Myths Busted
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Symptoms: Juddering, erratic harsh, or flaring shifts, loss of odd gears, loss of even gears, loss of reverse, total loss of drive, in some cases stalling of the engine.
The cause of this could be due to dirty oil, blocked filters, bad earth, faulty battery, a lazy starter motor (causing kick back on cranking. Most commonly Diesel Models) solenoid fault, worn valve body, failure of the transmission control module (TCM).
The 6DCT450 called the Powershift in Ford and the MPS6 in Volvo applications is a 6-speed dual wet parallel multi-clutch gear box. This gear box contains two input shafts (one inside another), two outputs shafts, a reverse idler gear and differential. Input shaft 1 (Inner Shaft) drives 1st, 3rd, 5th and Reverse. Input shaft 2 (Outer Shaft) drives 2nd, 4th and 6th. Output shaft 1 synchronizes 1st, 2nd, 3rd and 4th. Output shaft 2 synchronizes 5th, 6th and Reverse. The two input shafts are driven by the two clutches C1 and C2. The dual clutch assembly has an integral damper system which eliminates the need for a dual mass flywheel.
The failure of the damper system is the most common cause of transmission issues.
This is down to the breaking up of the plastic retainers and spaces. The plastic parts are then rotated at engine speeds in oil machining them down into small enough particles along with metallic swarf from the spring sets which are now able to move around, contaminating the valve body and transmission.
To rectify this issue requires a full rebuild and starter motor as required. Carrying out a transmission flush may work for a short time as the issue will still contaminate the transmission.
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