Rear wheels jamming while driving is caused by too little differential oil in the PDK
02-18-2021, 07:39 AM
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Rear wheels jamming while driving is caused by too little differential oil in the PDK
Hi Porsche drivers.
I own a 997-MK2-PDK and the rear wheels were spontaneously jammed after which a slight spin followed. Fortunately, I was just driving on the exit of a highway, so there was no accident.
After an initial investigation, there appeared to be a grinding noise coming from the differential when turning the rear wheels. The oil was then drained from the differential and only 0.3L of the 3.0L came out, but with an enormous amount of icing dust and iron parts. After additional investigation by the PDK specialist, it appeared that oil was caked on the inside of the gearbox. All gears and bearings were blue from the heat and the bearing of the Pilon wheel towards the crown wheel of the differential had completely broken due to the same overheating, causing the rear wheels to jam.
Apart from the housing, all internal components of the PDK must therefore be replaced.
Now the car had just been serviced and there was no leakage on both the shaft seals, drain plug or other possible leaks. This was also confirmed by both companies who carried out the inspections after the incident. The big question is therefore where did the remaining oil (2.7L) go? There will be a small volume caked on due to the large overheating that has taken place, but not 2.7L.
Porsche prescribes that the 3L differential oil must be replaced once every 12 years with an inspection for possible leaks on the shaft seals and drain plug during all maintenance intervals. In the meantime, the PDK and engine oil must be changed according to the maintenance schedule. Both of these were therefore refreshed during the last maintenance.
It is a big mystery to me why the rear wheels jammed because the car had driven 106000km without any problems before maintenance, of which I myself as the current owner. After the maintenance it took another 3000km before the damage was so great that the rear wheels got stuck.
Because this is not logical, I am very shocked and I am afraid whether this can happen again?
I would therefore emphatically ask everyone here who knows or knows someone who has or has had to deal with a similar PDK problem.
I own a 997-MK2-PDK and the rear wheels were spontaneously jammed after which a slight spin followed. Fortunately, I was just driving on the exit of a highway, so there was no accident.
After an initial investigation, there appeared to be a grinding noise coming from the differential when turning the rear wheels. The oil was then drained from the differential and only 0.3L of the 3.0L came out, but with an enormous amount of icing dust and iron parts. After additional investigation by the PDK specialist, it appeared that oil was caked on the inside of the gearbox. All gears and bearings were blue from the heat and the bearing of the Pilon wheel towards the crown wheel of the differential had completely broken due to the same overheating, causing the rear wheels to jam.
Apart from the housing, all internal components of the PDK must therefore be replaced.
Now the car had just been serviced and there was no leakage on both the shaft seals, drain plug or other possible leaks. This was also confirmed by both companies who carried out the inspections after the incident. The big question is therefore where did the remaining oil (2.7L) go? There will be a small volume caked on due to the large overheating that has taken place, but not 2.7L.
Porsche prescribes that the 3L differential oil must be replaced once every 12 years with an inspection for possible leaks on the shaft seals and drain plug during all maintenance intervals. In the meantime, the PDK and engine oil must be changed according to the maintenance schedule. Both of these were therefore refreshed during the last maintenance.
It is a big mystery to me why the rear wheels jammed because the car had driven 106000km without any problems before maintenance, of which I myself as the current owner. After the maintenance it took another 3000km before the damage was so great that the rear wheels got stuck.
Because this is not logical, I am very shocked and I am afraid whether this can happen again?
I would therefore emphatically ask everyone here who knows or knows someone who has or has had to deal with a similar PDK problem.
