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Old 09-06-2003, 03:17 PM
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Join Date: Mar 2003
Location: Oklahoma/Missouri
Posts: 74
What sizes of hex sockets do I need to get ?

I see the 14 mm hex socket is common on the differential and the transmission drains and I got one of these.

I'm wondering what other sizes of the hex (allen-type) sockets should I obtain to be ready to work on the Mercedes - mostly w124, w123, and w126 models ?

I ask as I have an assortment of hex sockets that I'm selling on ebay in the next few weeks and want to make sure I keep any that I may need in the future.

Last edited by Cressida; 09-09-2003 at 03:02 PM.
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Old 09-06-2003, 03:51 PM
sixto's Avatar
smoke gets in your eyes
Join Date: Jun 2000
Location: SF Bay Area
Posts: 20,117
I don't know that you need sockets for everything. In many cases a hex key will do. I have a 14mm key for the diff. The other sizes I remember using are 4mm, 5mm, 6mm, 8mm and 10mm. If you have an M103, you'll need a 17mm bit to torque the tentionser. Might be cheaper to buy a 17mm key and cut a 2" stub to use in a 17mm socket.

Sears sells a set with 4mm, 5mm, 6mm, 7mm, 8mm and 10mm for not a lot of money. My 10mm one is a little twisted from trying to remove a W126 front rotor from the hub. Ended up taking it to a machine shop to be heated. The twisted socket still works and I can probably go to Sears and swap it for a new one.

If you're thinking of sockets over keys so you can apply more torque, consider that you can use a wrench on the shank of a key and a key with a wobble tip is more useful than a socket without a wobble tip. And i find that in many situations a socket is either too tall or too wide to get to the bolt head.

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