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#1
03-03-2009, 11:40 AM
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stuck top plug w123 diff
Tried to change out the diff fluid this morning, but couldn't get the top plug off with a 14mm allen socket and a breaker bar.
Wonder what is safe to try? heat, cold, impact wrench, etc. I sprayed some PB Blaster on there, but I doubt it will help much. 
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#2
03-03-2009, 11:42 AM
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I had that problem too.What I did was put in tight fitting allen,used another jack on the allen,using the weight of the car to break it loose.
__________________
1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt
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#4
03-03-2009, 12:48 PM
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I had that problem when I was changing my axles. Since I had to take the diff apart anyway, I pulled the diff cover with the plug still in it, clamped the cover to a workbench and heated it with a propane torch. It then came out easily. You should be able to do the same trick with the cover still on the diff.
The problem is the usual one of dissimilar metals, a steel plug in an alloy cover. Use a sealant (Teflon tape) or some anti-seize when you put the plug back in. Jeremy
__________________
 "Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970
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#5
03-03-2009, 12:52 PM
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Quote:
Heat around the outside of the plug with a propane torch for about 60 seconds. The plug will come right out.
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#6
03-03-2009, 01:01 PM
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thanks for the tips
I'll try propane tonight.
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#7
03-03-2009, 01:04 PM
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Its easy to break both those plugs open by setting the handle of the breaker bar on a floor jack, and lifting on it. Then you have 2000lbs of car popping it loose.
 Works for me every time if its stuck.
__________________
-diesel is not just a fuel, its a way of life-  '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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#9
03-03-2009, 01:59 PM
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Dry ice.
__________________
http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42
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#10
03-03-2009, 03:32 PM
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Use anti seize on the threads when you replace it, make it easier to remove next time.
I use it on most everything. Charlie
__________________
there were three HP ratings on the OM616... 1) Not much power 2) Even less power 3) Not nearly enough power!! 240D w/auto Anyone that thinks a 240D is slow drives too fast. 80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works
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#11
03-03-2009, 03:41 PM
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Quote:
__________________
-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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#12
03-03-2009, 04:24 PM
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I soaked the plug in PB blaster for 2 days and then used a old torque wrench and it came off after a little bit of pulling.
__________________
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
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#13
03-03-2009, 04:27 PM
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I've got an impact wrench and a floor jack...I just wanted to check before I got medieval on it. It works now, I don't want to make it not the case.
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#14
03-03-2009, 04:31 PM
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don't use a impact wrench!!!!!!
__________________
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
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#15
03-03-2009, 06:22 PM
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Yes, an impact is the quick way to crack the housing.
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