S-Class (W126) 1979-1991: 300 SE, 300 SEL, 380 SE, 380 SEL, 420 SEL, 500 SEL, 560 SEL, 360 SEC, 500 SEC, 580 SEC, 300 SD TURBODIESEL, 300 SDL TURBO, 350 SD TURBO, 350 SDL TURBO

Rear diff fill plug wont budge-

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Old Feb 14, 2012 | 01:54 AM
  #1  
schurmann's Avatar
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1989 300 SE
Rear diff fill plug wont budge-

Hi all-

I need help with my '89 rear diff- Need to get the lube changed out, but the fill plug won't budge with big 1/2 drive wrench & allen socket. The allen fits perfectly.
I know the housing is a alloy but don't know if it's magnesium, if magnesium then I can't heat with too much heat---- anyone had the same problem?
What would work to get this fill plug loose?
(1989 300SE)
Thanks!
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Old Feb 14, 2012 | 02:01 PM
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98 Black C43 , 12’ ML 350 Blutec
Air compressor and a impact gun.
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Old Feb 20, 2012 | 02:06 PM
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(1960) 300d, S550 AMG S500 S600 560SEL
spray penetrating oil and slowly wrench it out with slight tapping on the back of the range to act as an impact
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Old Feb 23, 2012 | 08:11 PM
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1989 300 SE
Thanks, will try Best Pen oil I can find w/ impact wrnch andor cheater bar.
Thanks!
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Old Feb 23, 2012 | 11:09 PM
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From: LI, NY
(1960) 300d, S550 AMG S500 S600 560SEL
Originally Posted by schurmann
Thanks, will try Best Pen oil I can find w/ impact wrnch andor cheater bar.
Thanks!
make sure not to over do it or introduce excessive force or you might regred and break more parts in doing so.
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Old May 19, 2012 | 10:59 PM
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1989 300 SE
Thanks for all replies. Took it to Mercedes of Salem Oregon, they took care of it along with other repairs. Went fantastic, that is a great service center- I highly recommend them.
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