Ahh...it's where what looks like a bung, to the right of the label is located. There was not a bung fitted on mine.

That said, there were no visible signs of water or dirt ingress inside the unit when I took the cover off, everything looked as clean as a whistle.

Cheers , haven’t been able to see what that’s for, wonder if u can get a blanking grommet for it just in case to. prevent any ingress of water etc

If I find anything will post up a link for u
 
Now that the unit is back in position it will be nigh on impossible to measure the diameter of the hole other than by dropping the prop shaft again . I am 100% sure that the bung was not there before I removed the unit. I could however do a do or die fix by putting a Duct tape patch over it. I gave the cover & case a good clean before reassembling and the tape should stay in place.
Thanks Bud for posting the picture of the unit as I wouldn’t have known otherwise.
 
I can't see the hole.....need to go to Specsavers !!!!:D
Could be to dissipate any heat from the motor and prevent condensation because there is a PCB inside ??
I don't think the hole in the plastic cover is threaded. Maybe Duct tape with a small hole bodged through it with a screwdriver ???
The actuator is located about the same height from the ground as the spare wheel above the rear diff in the body arch
 
I can't see the hole.....need to go to Specsavers !!!!:D
Could be to dissipate any heat from the motor and prevent condensation because there is a PCB inside ??
I don't think the hole in the plastic cover is threaded. Maybe Duct tape with a small hole bodged through it with a screwdriver ???
The actuator is located about the same height from the ground as the spare wheel above the rear diff in the body arch
It’s just a rubber grommet, no hole in it.
 
Now that the unit is back in position it will be nigh on impossible to measure the diameter of the hole other than by dropping the prop shaft again . I am 100% sure that the bung was not there before I removed the unit. I could however do a do or die fix by putting a Duct tape patch over it. I gave the cover & case a good clean before reassembling and the tape should stay in place.
Thanks Bud for posting the picture of the unit as I wouldn’t have known otherwise.

Glad it helped , indeed from others is indeed just a blanking plug , i also enquired on the D3 forum and they also said the same , At least we now know what it is

At the end of the day glad u got it all sorted out and saving a fair few bob along the way :D

Suppose in future if someone else removes theres and the grommet is missing then maybe something like a bulkhead fitting will be of use ??
 

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