The part - the blade type piece that keeps the door from opening too far.
Mine works VERY hard. Seems to be wreaking the frame mount.
I went to a pick and pull today, was going to get a replacement part. Took the door panel off and couldn't reach inside far enough to touch. Seems that unit may be mounted with 2 big rivets. I didn't have a drill, so couldn't try to remove.
And I did spray lots of WD-40 on mine.
Anybody ever try and replace one of these?


---------------------
1984 MB 300SD Turbo

look for door check at fastlane.

__________________
1985 300D cali 190K

http://mercedes.thatchermathias.com/mw300d.jpg

You can use the search function and find the story about one of the forum members who had to saw the thing off on a very cold night using a dremel tool in order to get the door shut.

The way to remove it is:
Undo the 13mm head (I think?) bolt(s) in the door that are in line with the blade; the door check is about 6 inches long.
Then drive the pin in the door UP with a small hammer.
The door check can be removed.
Don't even bother trying to rebuild it; and lubrication doesn't seem to help for long.


Good Luck

__________________
daw_two
Germantown, TN

Links:
Sold last car --- 05/2012 1984 300D Light Ivory, Red interior
Cluster Needles Paint
New Old Stock (NOS) parts

Past:
3/2008 1986 300SDL "Coda"
04/2010 1965 190D(c) "Ben"
& many more

The service manual says use a drop of motor oil periodically to lubricate door checks. When you change you oil lube the doors.

Go back to the boneyard and pull a couple for spares. Follow the above directions except I think they were 10mm bolts and a flat washer type keeper that has to be removed with a pair of pliers on the dowel pin.

You will see, easy repair.

__________________
If it ain't broke take it apart and find out why.

1983 300SD, 4 speed
1994 C280
1987 300TD wagon
1996 HD Road King

Ride in Peace Eric Peterson, Harley of Macon

It's really hard to get lubricant into the correct place on the door check straps. I'd just replace it because it can jam tight in the open position. I've dissassmbled one but putting it back together bordered on the impossible.

__________________
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

For lubricating door hinges, mechanisms and locks etc I swear by motorcycle chain lube, I use castrol brand.

It comes in a spray can with a straw like WD40 and sprays on very similar, then the solvent evaporates and leaves a nice lubricating wax in all the right places.

__________________
Current Rides:

2004 BMW R1150GS Adventure
2005 MB W211 E320 Cdi

The difficulty is in getting the lubricant to the two spring loaded balls which slide in the rails. There are holes in the rails which in theory would allow lubricant to get around the balls but those holes are at the end of the check strap buried in the door, impossible to access without removing the strap. I don't think you could lubricant into those holes even if the inner door panel is removed.

__________________
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

All fixed up!!! Went to another pick & pull today. Got lucky. Found a 126 model. It was black, like mine. Got the door check, the plastic door sill, and the gasket(?) that goes around cabin opening. Everything in black.
Thanks all for your help.