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Old 06-17-2010, 05:00 PM
Registered User
Join Date: Jul 2006
Posts: 185
Question ignition switch

just changed out the ignition switch in a 1988 560sel, because of locking when trying to turn the key. new ignition still locks (according to my other half), as she is driving the car.

i suggested spraying some wd-40 in the switch to see if that would help. am i on base with the suggestion or is there something that i am missing.

austin, tx

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Old 06-17-2010, 09:24 PM
TnBob's Avatar
Registered User
Join Date: Dec 2009
Location: Shelbyville, Tn
Posts: 1,907
I would sure be using a dry lube rather than WD40.

Might be worth having a lock smith look at it too.
1985 300D 198K sold
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1992 940T

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Old 06-18-2010, 12:53 AM
hey_allen's Avatar
greasy fingered tinkerer
Join Date: May 2006
Location: Tacoma, WA
Posts: 728
Did you change the switch (electrical bits on the rear of the lock assembly), the tumbler (where you put the key), or the lock assembly (aluminum piece that extends down into the steering column)?

On my 300SD, it was the column lock bar in the lock assembly that was worn and jamming when the key was removed. I replaced it, and reused the same lock tumbler, with no binding issues.

Testing the cheap Mercedes axiom, one bolt at a time...
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