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#1
09-08-2005, 08:26 PM
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timing chain cover 420sel
I'm trying to remove the timing chain cover on my 91 420sel.I have remove everything around,and started to remove the cover.It moved for about 1/2 inch,and now it wont budge,especialy on the lower right side.What could be holding it?The cover is wedge between the heads,and the upper oil pan.Does the oil pan need to be lowered to facilitate the task?Was wondering also if the worm gear for the distributer simply slides out of the cover?
Thanks for the help. 
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#2
09-08-2005, 09:48 PM
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Looking at this job on my 560SL (same engine manual for the 420 and 560). The manual calls for the oil pan and oil pump to be removed. I'm not sure why. All my exploded view diagrams show no interference. But the manual does call for it. On the drivers side of the timing cover is the oil pump chain tensoiner. This may be hung up on the chain preventing it from releasing.
I would drop the oil pan and see if this is where its hanging up. Do you have the service manual for the engine? If not give me your email and I will forward the PDF files for the whole job. It will be 8 jobs so it will be a large file. Pictures and info on this job would really be appreciated at least by me. I'm looking at replacing the upper and lower chain guides as well as the chain. Dave
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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; 09-08-2005 at 11:58 PM.
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#3
09-10-2005, 11:56 AM
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To follow up on this post for future reference.
Moi PM ed me to let me know tha the oil pump did have to come off. "Thank for your respone.The cover is off.Yes oil pump ,chain and sprocket,and guide have to be removed.They do interfere with timing cover removal." Dave
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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
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