: '78 Deville "ignition lock cylinder" replacement.



pompste
07-10-11, 06:57 AM
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

DouglasJRizzo
07-10-11, 07:41 AM
Hoo boy. I've always wondered about this one myself. Do you have a service manual?

deVille33
07-10-11, 09:26 AM
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.

sven914
07-10-11, 11:08 AM
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.

pompste
07-10-11, 09:28 PM
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!

pompste
07-10-11, 09:38 PM
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?

pompste
07-10-11, 10:00 PM
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.

drmenard
07-11-11, 12:43 AM
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 ?

pompste
07-11-11, 01:07 AM
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.

pompste
07-11-11, 05:26 AM
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?

pompste
07-11-11, 07:59 PM
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.

drmenard
07-11-11, 10:02 PM
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...

cadillac_al
07-11-11, 11:17 PM
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.

drmenard
07-12-11, 12:33 AM
You will need another tool when you have the tilt and telescopic ....

pompste
07-12-11, 04:20 AM
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!

sven914
07-12-11, 12:21 PM
I've been inside more transmissions than I can count, and I still don't want to take one apart. I think taking the car to a professional is a wise choice, because if something happens, you have an entire corporation to sue for damages.

pompste
07-12-11, 11:49 PM
Took my '78 Caddy to my trusted mechanic today for an estimate.Keep in mind he`s old school--in his late 50`s,worked on many older vehicles and i`ve been taking both my Caddy`s to his shop for the past 5 years with great results.
He wants me to find a "steering column diagram" for my '78 Deville to see all parts in there.His shop computer database only goes back to 1982.
If anyone could find the diagram and post it here--i`d really appreciate it! I`ll look for it online myself too.If i find one i`ll chime in here quick to let ya`ll know.

pompste
07-17-11, 02:56 PM
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.

I`ve got the wheel removed now.The big problem now is i don`t know how to remove/disassemble the the telescopic mechanism.I threaded the lock plate compressor tool on the shaft only to find that the shaft extends and retracts 2-3 inches.I don`t see any way to compress the lock plate since the telescopic mechanism sets just above the lock plate.I`m stumped and can`t find any info on how to fix it.
I sure hope no one else ever has this problem with the telescopic feature as this problem seems to have myself and everyone else here stumped.I`ve started another thread on this problem.

sven914
07-17-11, 03:49 PM
I'm looking at the procedure for my '89 (I don't have the service information for any other model or year), and it does not go into specifics about how to repair the Tilt/Telescopic.

pompste
07-17-11, 08:35 PM
I'm looking at the procedure for my '89 (I don't have the service information for any other model or year), and it does not go into specifics about how to repair the Tilt/Telescopic.

Thanks for looking,sven.Seems the procedure for the tilt/telescopic is proving to be real elusive.I`ve been looking online and no luck so far either.The procedure has to be around somewhere,after all many Cadillacs had the tilt/telescopic feature back in the day and more than likely needed to have the ignition lock cylinders replaced at some point in time.
I`ve inspected real closely, for over 2 hours, what`s there now with the steering wheel off,trying to figure some way to remove the telescopic hardware that sets on the lock plate,but there are really no clues.It`s just a small white plastic base with the extendable/retractable shaft in the middle of it.When the lock plate compressor tool is fully threaded on the shaft,it just extends when i pull on it and then the 2 side braces of the lock plate compressor tool are 3 inches or so from the lock plate.
There is also some type of collar around the shaft,about an inch below the top end of it.