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Old 07-10-2006, 04:05 PM
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dmorrison dmorrison is offline
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Join Date: Dec 2002
Location: Colleyville, Texas
Posts: 2,695
The upper crank support unit has a sealant between the block, the lower oil pan and the piece. So to remove, clean and reseal the unit you will have to remove the radiator, the pulley, the balancer, the front seal and the front crank bearing. Clean the support piece. Use a sealant, Mercedes has this specific sealant. Mercedes part # A003 989 98 20 10. Also while your doing this you should replace the crank centering bearing and front crank seal.
Here's the bad part. Reinstalling the upper support requires a special tool. to align the upper half so it is centered on the lower half. This is so the front crank seal will not leak. I was able to borrow the dealers unit for this job. Can it be done without the tool? Probably. Just make sure the upper and lower edge where the crank seal goes are aligned as much as possible. The tool also centers the upper support to the crank shaft center. ( Sir tool does sell it M716-0014. go to the top and click on "Special tool" and go to page11, item 617-0014)
Remember to mark you balancer for reinstalling. Not 1-2 degree specific, just don't want it 180 degrees out. I positioned it as carefully as possible, aligning the 2 holes on either side of the shaft, and then drove the 2 small aligning cylinders into the receiving holes. Some of the small cylinder material may shave off as you install them.
While your doing all this work consider replacing all the accessories seals on the front of the block. Vacuum pump, Hydraulic pump (if SLS), Timing chain rail access bolts, TDC holding bracket bolt sealant. These are potential leak points and your there anyway.
Here is a post on the job I did on the 300TD.

1970 220D, owned 1980-1990
1980 240D, owned 1990-1992
1982 300TD, owned 1992-1993
1986 300SDL, owned 1993-2004
1999 E300, owned 1999-2003
1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD
1988 560SL, 100,000mi, owned since 1995
1965 Mustang Fastback Mileage Unknown(My sons)
1983 240D, 176,000mi (My daughers) owned since 2004
2007 Honda Accord EX-L I4 auto, the new daily driver
1985 300D 264,000mi Son's new daily driver.(sold)
2008 Hyundai Tiberon. Daughters new car

Last edited by dmorrison; 08-14-2006 at 02:11 AM.
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