Rear diff fill plug wont budge-

schurmann · 02-14-2012, 01:54 AM

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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C43AMG · 02-14-2012, 02:01 PM

Air compressor and a impact gun.

cool_lagoon · 02-20-2012, 02:06 PM

spray penetrating oil and slowly wrench it out with slight tapping on the back of the range to act as an impact

schurmann · 02-23-2012, 08:11 PM

Thanks, will try Best Pen oil I can find w/ impact wrnch andor cheater bar.
Thanks!

cool_lagoon · 02-23-2012, 11:09 PM

Quote:

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.

schurmann · 05-19-2012, 10:59 PM

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.

02-14-2012, 02:01 PM	#2
C43AMG MBWorld Fanatic! Garage is empty, add now Join Date: Feb 2005 Location: The Soprano State - NJ Posts: 5,757 Drives: 98 Black C43 , 00' C230K , 91 420SEL , 08' ML320 CDI	Air compressor and a impact gun. __________________ No engine , no badge

02-20-2012, 02:06 PM	#3
cool_lagoon Senior Member Garage is empty, add now Join Date: Jun 2004 Location: LI, NY Posts: 367 Drives: (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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02-23-2012, 08:11 PM	#4
schurmann Junior Member Garage is empty, add now Join Date: Oct 2009 Posts: 61 Drives: 1989 300 SE	Thanks, will try Best Pen oil I can find w/ impact wrnch andor cheater bar. Thanks!

05-19-2012, 10:59 PM	#6
schurmann Junior Member Garage is empty, add now Join Date: Oct 2009 Posts: 61 Drives: 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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