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Old 06-15-2002, 10:04 AM
Coming back from burnout
Join Date: Jun 1999
Location: in the Pacific Northwest
Posts: 2,274
Sticking ignition lock 85 Mercedes 300D

My ignition lock , which normally worked fine,sticks and it drives me crazy. I jiggle it and whatever and it alwys seems to turn after 45 tries.I sprayed WD 40 down the keyhole and its round case. It still sticks at unpredictable times. The next time it flat out doesnt turn, naturally, I will be 300 miles from home.

Does anyone have any ideas?
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Old 06-15-2002, 10:19 AM
engatwork's Avatar
Join Date: May 2000
Location: Soperton, Ga. USA
Posts: 11,878
Get the straightened out paper clip, the new steering lock mechanism and tumbler and replace them asap. One time I put a drill bit on the tumbler and it did not even scratch it. I hate to hear of people having ignition tumbler/steering lock issues in these cars.
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Old 06-15-2002, 11:32 AM
mikemover's Avatar
All-seeing, all-knowing.
Join Date: Aug 2001
Location: Atlanta, GA
Posts: 5,514
YES, REPLACE IT NOW!!!! It's very easy and not too expensive to do when you can still turn the key. It's a BIG pain and will cost you $$$ to have it done after it won't turn anymore! Ask me how I know!....

1979 300 SD
350,000 miles
1982 300D-gone---sold to a buddy
1985 300TD
270,000 miles
1994 E320
not my favorite, but the wife wanted it
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Old 06-15-2002, 03:24 PM
190dee's Avatar
Registered User
Join Date: Dec 2001
Location: Finland
Posts: 160
I second on the other replies. I read somewhere in the forum that you really shouldn't try to lubricate the ignition lock.

Do a search as you will find materials for the whole replacement on the forum. I had the same problem put endid up vibrating my key to get it turned. Do the removal a.s.a.p and get a borrowed tumbler from your local dealer.

In my case I just replaced the tumbler although my dealer suggested to change both tumbler and steering lock mechanics. Now it works fine and there haven't been any problem with the lock.

My topic on this was: Ignition lock broken - help needed.
'87 MBenz 190E 2,3 8vlv
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Old 06-16-2002, 07:30 PM
Senior Member
Join Date: Jun 2001
Location: Northern Calif. (Fairfield Area)
Posts: 2,225
Put the WD40 can away. Take your chassis # and registration to your nearest dealer and order a coded tumbler as soon as possible. If you put this off or listen to somebody's snake oil remedy, you will pay dearly. What you are dealing with is a chronic problem since MB lost the formula for good quality ignition locks. Anybody driving a 1960's 220Sb more than likely has the original ignition lock.

Good luck,
Auto Zentral Ltd.
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