Can anyone tell me the mm size hex key that removes the check bolt for the rear end? I remember it's in the 30s, but couldn't remember if that's 33, 35, or 37.

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1983 300D, the "Avocado"
1976 240D, 4-spd the "Pumpkin", SOLD to Pierre
1984 190D, 2.2L, 5-spd, my intro to MBZ diesels, crashed into in 2002

Anything requiring a hex key that large rides on rails and blows a whistle when crossing roads.

I thought it was around 14mm.

I have used the below pictured Rod Couplings and a Socket with Braker Bar on similar situations.

If you read the DIY with Mercedes it is handy to have a Propane Torch to heat up the area around the Plug if you have never had it out before

You also might find the size below:
DIY Repair Links
DIY Links by Parts Category - PeachParts Mercedes ShopForum

PeachPartsWiki: Do It Yourself Articles - Mercedes Vehicles

Attached Thumbnails

 

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84 300D, 82 Volvo 244Gl Diesel

It's 17mm.
I changed my 1987 300SDL transaxle fluid a couple of weeks ago and had to buy the hex wrench for it.

That would depend on the year/model.

For some reason, folks posting here find it incredibly difficult to start their post with "I am working on a 19XX YZZSD."

my SD was a 14mm

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1984 300SD Orient Red/ Palomino
1989 560SEC
2016 Mazda 6 6 speed manual
1995 Ford F-150 reg cab 4.9 5speed manual

14mm, 1981 300TD, Fill and drain.

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1981 300TD "The Green Lantern"
1980 300TD
1983 300D Euro "China Cat"

W123's have a 14mm allen bolt for the fill and drain plugs

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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg

Make sure to remove the fill plug first!!!!

14mm on all my w123s. Wasnt the easiest tool to find when I was shopping for it.

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Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (113k)
1991 350SD (206k)
1991 300D (228k)
1993 300SD (291k)
1993 300D 2.5T (338k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (265k)

Past Diesels:
1983 300D (228K)
1985 300D (233K)

A dog-leg lever with two mounted 14mm hex studs came in the W-115 tool kit. Still have it and it fits the plugs on the 220D and the 83 300D. Great tool, too bad it is no longer in the tool kit !!!

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1961 190Db retired
1968 220D/8 325,000
1983 300D 164,150

Well if it is a train it could be from 18XX...

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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!

didn't get the original hex key or tool box with this car. And it's an '83 300D. Guess I'll be off to Harbor freight later today. Thanks. I do remember the fun I had removing it from the 240D, which hadn't been touched ever, I think. . . .. looks around for a cheater bar . . . .a long one!

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1983 300D, the "Avocado"
1976 240D, 4-spd the "Pumpkin", SOLD to Pierre
1984 190D, 2.2L, 5-spd, my intro to MBZ diesels, crashed into in 2002

If you are buying tools get a 1/2" socket with a 14mm hex in it - and put that on your grolly bar...

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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!

Grolley Bar???? Got a pic of that???

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1983 300D, the "Avocado"
1976 240D, 4-spd the "Pumpkin", SOLD to Pierre
1984 190D, 2.2L, 5-spd, my intro to MBZ diesels, crashed into in 2002