'78 Deville "ignition lock cylinder" replacement.
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RWD 19xx-1984 DeVille and Fleetwood,
1985-1996 Fleetwood and Brougham Forum Discussion, '78 Deville "ignition lock cylinder" replacement. in Past Cadillac Vehicle Discussion; Seems i`m going to have to replace my '78 Deville`s ignition lock cylinder.The "accesory" position,turning the key backward to play ...
  1. #1
    pompste is offline Cadillac Owners Connoisseur
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    '78 Deville "ignition lock cylinder" replacement.

    Seems i`m going to have to replace my '78 Deville`s ignition lock cylinder.The "accesory" position,turning the key backward to play the radio,stopped working about 2 months ago and now just turning the key forward is becoming more difficult each week.I`d rather get it replaced "before" it quits completely and i`m stuck someplace having to get a tow.
    Can this be done by a do it yourselfer or would it be better to have my trusted mechanic replace it?
    Luckily this Caddy is pre-computer era with no chips in the keys.
    If anyone could recommend a good place to buy a new one,it will be appreciated!
    Thanks

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    DouglasJRizzo is offline Cadillac Owners Enthusiast
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    Re: '78 Deville "ignition lock cylinder" replacement.

    Hoo boy. I've always wondered about this one myself. Do you have a service manual?

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    deVille33 is offline Cadillac Owners Connoisseur
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    Re: '78 Deville "ignition lock cylinder" replacement.

    Before replacing the cylinder, check that the switch unit that is located down the column hasn't loosened. sometimes the selactor switch comes losse and it will seem that the cylinder is the problem when the loose switch is the culprit.
    Do you have a second set of keys? Does the problem persist with both key sets? Perhaps your key is worn. Sometimes a new key can work in this situation.

  5. #4
    sven914's Avatar
    sven914 is offline Cadillac Owners Connoisseur
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    Re: '78 Deville "ignition lock cylinder" replacement.

    To remove the ignition switch, you need to disassemble the Tilt/Telescopic mechanism (if used), then use a steering wheel puller to remove the steering wheel and then remove the shroud and extension. Then you remove a retainer and behind that is a spring.

    With all of that removed, turn the ignition to RUN (the battery should have previously been disconnected). You should see a clip for the key warning buzzer; remove it. The ignition switch is held in by a retaining screw, and once that is removed, the cylinder should come out.

    I would not recommend doing this yourself. If you have the tilt/telescopic column, the mechanism is nearly impossible to put back together. There are a lot of little parts and a lot of little things to go wrong.

  6. #5
    pompste is offline Cadillac Owners Connoisseur
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    Re: '78 Deville "ignition lock cylinder" replacement.

    Quote Originally Posted by sven914 View Post
    To remove the ignition switch, you need to disassemble the Tilt/Telescopic mechanism (if used), then use a steering wheel puller to remove the steering wheel and then remove the shroud and extension. Then you remove a retainer and behind that is a spring.

    With all of that removed, turn the ignition to RUN (the battery should have previously been disconnected). You should see a clip for the key warning buzzer; remove it. The ignition switch is held in by a retaining screw, and once that is removed, the cylinder should come out.

    I would not recommend doing this yourself. If you have the tilt/telescopic column, the mechanism is nearly impossible to put back together. There are a lot of little parts and a lot of little things to go wrong.
    Thanks for the info to all who chimed in.
    I do have the tilt/telescopic column and since there`s so many little parts,i`ll have my trusted mechanics at my local MEINEKE center have a look at.They`ve been working on both my Caddy`s for the past 5 years and have been real fair/friendly with me also!

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    pompste is offline Cadillac Owners Connoisseur
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    Re: '78 Deville "ignition lock cylinder" replacement.

    Quote Originally Posted by deVille33 View Post
    Before replacing the cylinder, check that the switch unit that is located down the column hasn't loosened. sometimes the selactor switch comes losse and it will seem that the cylinder is the problem when the loose switch is the culprit.
    Do you have a second set of keys? Does the problem persist with both key sets? Perhaps your key is worn. Sometimes a new key can work in this situation.
    It does seem like something may be loose in there since sometimes the cylinder rotates real good and then sometimes it`s seems like it`s caught on something in there and it`s difficult to rotate.I`ve got 3 ignition keys,1 original and 2 duplicates,and i`ll check those out too.
    Is the "switch unit" you mentioned inside the column?

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    pompste is offline Cadillac Owners Connoisseur
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    Re: '78 Deville "ignition lock cylinder" replacement.

    Quote Originally Posted by DouglasJRizzo View Post
    Hoo boy. I've always wondered about this one myself. Do you have a service manual?
    I`ve got a Haynes and a '78 Cadillac service manual supplement but it seems a somewhat intricate procedure and since i don`t have the proper tools,it seems i should take it in to my trusted mechanics.I had hoped to save some money on labor charges since i`m currently living on foodstamps and minimal unemployment pay here in Michigan.

  9. #8
    drmenard is offline Cadillac Owners Connoisseur
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    Re: '78 Deville "ignition lock cylinder" replacement.

    I have taken these apart many times .. It is not hard with all the proper tools.. without the tools impossible....I could pull it all apart , change the lock and put it all back together in a hour or less... So if they want more than $100 labor, they are ripping you off...You might be able to buy the tools on ebay for a whole lot less... How good are you at taking things apart ?

  10. #9
    pompste is offline Cadillac Owners Connoisseur
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    Re: '78 Deville "ignition lock cylinder" replacement.

    Quote Originally Posted by drmenard View Post
    I have taken these apart many times .. It is not hard with all the proper tools.. without the tools impossible....I could pull it all apart , change the lock and put it all back together in a hour or less... So if they want more than $100 labor, they are ripping you off...You might be able to buy the tools on ebay for a whole lot less... How good are you at taking things apart ?
    I`m a good do it yourselfer and i like taking things apart and putting it all together again------but it seems in this situation many little things could go wrong and if i make mistakes,i`m left with not being able to start my Caddy and then i`d have to pay to have it towed in.
    I`ve found new lock cylinders at my local autozone fairly cheap at from $13 to $35.
    Since this is more than likely a "1 time fix only"---might not be wise to buy the tools if only used once.

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    pompste is offline Cadillac Owners Connoisseur
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    Re: '78 Deville "ignition lock cylinder" replacement.

    I`ve noticed while looking for new lock cylinders that some have "with" retainer screw,and some have "without" retainer screw--which should i get?

  12. #11
    pompste is offline Cadillac Owners Connoisseur
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    Re: '78 Deville "ignition lock cylinder" replacement.

    Quote Originally Posted by pompste View Post
    I`ve noticed while looking for new lock cylinders that some have "with" retainer screw,and some have "without" retainer screw--which should i get?
    Anyone? With or without retainer screw.

  13. #12
    drmenard is offline Cadillac Owners Connoisseur
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    Re: '78 Deville "ignition lock cylinder" replacement.

    I don't see why you would need a new screw.. They always come out and go back in without a problem...just don't lose it.. Taking it apart is not that tough... I used to fear doing things and fear was my biggest problem.. For years I would not take apart a transmission...

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    cadillac_al is offline Cadillac Owners Connoisseur
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    Re: '78 Deville "ignition lock cylinder" replacement.

    I don't use any special tools to remove a steering wheel or ignition lock; just a basic puller for pulling the wheel. I suppose the correct tools would make it easier but every time I think it is a one time thing.

  15. #14
    drmenard is offline Cadillac Owners Connoisseur
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    Re: '78 Deville "ignition lock cylinder" replacement.

    You will need another tool when you have the tilt and telescopic ....

  16. #15
    pompste is offline Cadillac Owners Connoisseur
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    Re: '78 Deville "ignition lock cylinder" replacement.

    Quote Originally Posted by drmenard View Post
    I don't see why you would need a new screw.. They always come out and go back in without a problem...just don't lose it.. Taking it apart is not that tough... I used to fear doing things and fear was my biggest problem.. For years I would not take apart a transmission...
    It may be wiser to get the one with the screw,with or without is the same price,---since the new aftermarket one might have a different sized screw--you never know.Apparently from what i`ve read here,the tilt/telescopic feature adds another obstacle to overcome and another tool.
    You`ve got courage to take a transmission apart!
    I`ll be getting an estimate tomorrow---if it`s over $100---Faaa-Get-About-It!

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