I need to change the axle shafts on my 1981 300D. In order to drain the differential what is the hex size? Thank you in advance.
Nate

Usually 14mm hex

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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!

Be sure to clean them out real well. You'll need a sm. pick and brake cleaner. Undo the top one first so that way if it's strips out you'll not be stuck with a empty Diff. If you do not have a 14mm hex yet, when you do get one go for a 1/2" drive USA made . Cheep will likely strip it out if it has not been changed in years. Good luck and stay safe under your car.
Regards

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2dieseljohn
1979 300sd (283,000+) Road Trips
1983 240D 4-speed (350,000+) Daily Driver
1967 E-TypeS1 in bits and pieces

Got the job done. Took me a a couple of evenings, but the first evening was met with an interruption. Keeping my rusty, but very faithful '81 300D on the road. I love the feel of a W123 ride.