Rear Differential: What size Allen wrench? - Mercedes-Benz Forum
 
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#1 (permalink) Old 04-10-2009, 12:56 PM
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Rear Differential: What size Allen wrench?

Draining and replacing the rear differential lube. What size Allen wrench is required back there? I don't have any that fit.
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#2 (permalink) Old 04-10-2009, 01:47 PM
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14mm hex. i found a set at harbor freight for 15$ its in socket form and you may need a 3/8 drive breaker to get the plugs out. i just did mine refilled with 44 ozs of mobil 1 synthetic lube. you will also need the small pump to refill the rear diff. no room to tip bottle. theres a tech on this very helpful
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#3 (permalink) Old 04-10-2009, 06:23 PM
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Originally Posted by 32krazy! View Post
14mm hex. i found a set at harbor freight for 15$ its in socket form and you may need a 3/8 drive breaker to get the plugs out. i just did mine refilled with 44 ozs of mobil 1 synthetic lube. you will also need the small pump to refill the rear diff. no room to tip bottle. theres a tech on this very helpful
I also bought it from Harbor Freight. The rear is not much of an issue. however, the real issue is with the transmission bolts as it uses the same 14mm hex however there is not much space. They sell 14mm Hex key for like $6 which is very useful and you can for sure open up the transmission also with it.
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#4 (permalink) Old 04-10-2009, 07:27 PM
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i guess you mean to remove the tranny from the engine? i think that may be beyond my abilities!
im also a bit of a tool slut! i cant help collecting new tools for my box!
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#5 (permalink) Old 04-10-2009, 08:58 PM
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3/8th", 1/4" drive, etc. allen and torx wrenches are far superior to old L shaped wrenches. You can get much better torque with the ratchet wrenches. Advance Auto has some decent sets usually with 3/8th" drives.

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#6 (permalink) Old 04-10-2009, 11:07 PM
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i guess you mean to remove the tranny from the engine? i think that may be beyond my abilities!
im also a bit of a tool slut! i cant help collecting new tools for my box!
No, I meant to remove the bolts to drain and refill the transmission oil. Only the above mentioned tool worked for for the 230. Of course, you have a different car so it might not apply to you.
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#7 (permalink) Old 04-11-2009, 06:00 AM
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definately different. my tranny bolts and drain plug were a small torx t27
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#8 (permalink) Old 04-11-2009, 11:20 AM
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So I guess my question is, is the transmission drain plug (size) on the manual different from the plug on the auto? Ditto the 230, 320, and 32? I presume the differential plugs are all the same?
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#9 (permalink) Old 04-11-2009, 11:24 AM
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cant say for the others but my 32 is an auto and needed a small metric allen for the drain plug. the bolts that hold the tranny pan were a small t27 torx
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