I just purchased a 1985 300D. So far have only driven it back to my house, and I already really like the car. Before It warmed up it would belch blue smoke when shifting gears. It doesn't weem to do this when it warmed up. Where should I start looking? This is the frirst diesel (and Mercedes)I have owned, any help would be appreaciated.

I would replace the valve stem seals first... then see if you still have the problem... lots of instructions in the archives... parts are CHEAP... just tedious to do it... but combine with valve adjustment and save some repeat labor....

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1980 240d ,

chain elongation, cam marks reference:
http://www.peachparts.com/shopforum/diesel-discussion/10414-help-i-need-check-stretch.html

http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html

evap fin cleaning:

http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator

A/C thread

http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html

Thanks...Yesterday I was pumped about getting this car....Today I am just seeing a long list of things to fix...Finding this fourm has made me start breating a little easier.

At least these cars are able to be worked on...
my others I can not... so many computers and sensors.. amazing..

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1980 240d ,

chain elongation, cam marks reference:
http://www.peachparts.com/shopforum/showthread.php?threadid=10414

http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html

evap fin cleaning:

http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator

A/C thread

http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html

I just seem to have a steep learning curve to make it up in the next few months...My son and I are going to work on it togeather so I think that it will be a fun climb.

Sharing it is a lot more fun.... not much worse than being a one man shop...even if they are not helping per se... having someone to share the frustrations with is nice...

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1980 240d ,

chain elongation, cam marks reference:
http://www.peachparts.com/shopforum/showthread.php?threadid=10414

http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html

evap fin cleaning:

http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator

A/C thread

http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html

Any time you buy an old used car there's a lot of stuff at first, generally speaking. I call it "deferred maintenance." The stuff the previous owner put off because they knew the car wouldn't be theirs much longer.

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1981 Mercedes 300TD, 1994 Honda Civic Del Sol
http://mefi.us/images/fuelly/smallsig-us/67195.pnghttp://mefi.us/images/fuelly/smallsig-us/103885.png