What sort of socket do I need to remove the output shaft locknut on a 722.303? It's a four-point locknut. It appears to be approximately 40 mm diameter / 1 9/16".

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Lots of diesel W126s in the past
Current: 1991 Toyota 4Runner with an OM603

There are two types of lock nuts. The older style takes a custom socket like this...



I've heard of people using a piece of tubing and grinding away areas to get to the pins as shown.

And the newer style nut looks like this and takes a deep socket 30mm 12point



If you have problems finding one, a 1-3/16" deep socket works just fine too. And if you can't find one of those (I couldn't), you can make one out of a standard 1-3/16" socket and just cut the back off and weld on a 15/16" socket, and you're good to go.

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Current Stable

• 380SL (diesel)
• Corvette C5
• Manx
• Baja Bug
• F350 Powerstroke
• Auburn Boattail Speedster replica

It's definitely the older style. Any idea where I could buy one?

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Lots of diesel W126s in the past
Current: 1991 Toyota 4Runner with an OM603

I did a quick search on this site and came up empty, so you should call, or do a search on ebay for "Pin Wrench Socket Tool".




It would be pretty easy to fabricate one if you had a piece of pipe, a grinder and a welder. You'll only need it once, because you can use the later style when you replace it.

Attached Thumbnails

 

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Current Stable

• 380SL (diesel)
• Corvette C5
• Manx
• Baja Bug
• F350 Powerstroke
• Auburn Boattail Speedster replica

Mercedes Special Tools

Enter 915-0807



.

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1983 123.133 California
- GreaseCar Veg System

If you don't get one. I have one that I can rent out. PM me. $15.00 shipped and $85 deposit.


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1983 123.133 California
- GreaseCar Veg System

It's easier to start with a deep socket that is the proper diameter, then grind off bits of the end to leave behind "pins." That way you don't have to do any welding. More "driveway friendly" for those without a full complement of tools.

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James Marriott
2003 Buick Regal
1983 300D (228k, frau Auto)
1996 Suburban K2500 (192k, 6.5 turbo diesel/4WD towmaster 10,000)
www.engineeringworks.biz
1987 300SDL junker 170k
1982 300SD junker, 265k

I just found this thread in a search and wanted to post the part number for the 30mm 12 point nut.

Febi Auto Trans Output Shaft Flange Nut; Rear Transmission Flange/Driveshaft Coupling
P/N: 1239900060

You can remove the old style with a hammer and screw driver. Trash it and buy one of these for less than $3.

pete

Thank you for the help, guys.

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Lots of diesel W126s in the past
Current: 1991 Toyota 4Runner with an OM603

I'm not sure if you can get the 4 pronged nuts anymore so I wouldn't be shelling out for a tool to remove it when you probably will need to replace with the newer 12-point version.

When I took my 722.1 transmission to bits I did this

722.118 Automatic transmission rebuild (Monster DIY)

The transmission was out of the car - which makes it a bit easier...

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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!

If you are careful you can take a hammer and punch and loosen that nut then discard it and get the new type to put it back together with. Don

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Red Green "This is only temporary,Unless it works!"

97 E300D 157000 miles
87 300TD ?141k? miles

You might be able to find a useable socket designed for the locknuts on the front hubs of a 4wd. Pep Boys sells a variety of kinds. The one I have for my Suzuki Sidekick looks somewhat similar to that.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

I decided to pull the whole transmission from my parts car and swap it into my daily driver.

It's not as ridiculous as it sounds -- my spare trans has 80k fewer miles than the one that is on the fritz.

Plus, you guys are right, I'm not about to spend $80+ for a socket I'm going to use once. And unfortunately I don't have any real fabrication capabilities (once again, the need to learn welding bites me in the butt)...

__________________
Lots of diesel W126s in the past
Current: 1991 Toyota 4Runner with an OM603