Question about 1978 Chevrolet C1500

2 Answers

Ignition Lock cylinder set removal

I am attempting to remove the lock cylinder set from my 1977 GM half ton. After pulling the turn signal switch over the end of the shaft, there are four bolts, I assumed the one at 3 oclock to be the lock retaining screw, removed it , with key turned to running position attempted to pry out the set and broke off the chrome outer ring, what am I missing as I can still pry but it is obviously still being held by something>

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  • rrd0 Jun 02, 2009

    No sir it did not.

  • rrd0 Jun 03, 2009

    Guys, tried wiggling, still no luck, the hex bolt I removed was 1 of 4, all into a cast part of this section of the colomn, there is a square opening thru all the way to the shift part of the column, I can't see anything sticking out from the lock set, but I can jiggle the lock set with a wire or small tool. 1977,Grand Sierra,305 originally,keys are well worn,The only other hole thru the cast is the rod hole which appears at the end of the cylinder and when I press it the cylinder turns to the start position...any more ideas, next I will be asking if there is a tool to pull/force it out . thks

  • Dar
    Dar May 11, 2010

    Did the bolt that you took out have a long threadless part on the end of it?

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  • Chevrolet Master
  • 2,007 Answers

Then you either got the wrong bolt, or the knob part is still in the hole. Take a close look at the bolt you took out, and see if something may have broken off it. If it did, you might be able to get the rest out with a magnet. There is a threadless part on the end of the bolt that's about an inch long. It goes down against the tumbler and hold it in there. The newer ones are a torx head, but i can't remember if 78 is or not.

Posted on Jun 02, 2009

  • Dar
    Dar Jun 03, 2009

    If you have that long bolt out, and it isn't broken, there shouldn't be anything else holding it.

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  • Master
  • 437 Answers

I don't think missed anything, Gm manual says you are spot on.

1. This lock tumbler has to be turned to the run position.
2. Remove lock plate, turn signal and buzzer switch.
3. Remove screw and lock cylinder: Caution if the screw is dropped on removal, it could fall into the column, requiring complete disassembly to retrieve the screw.

According to GM there is only one screw that holds the lock tumbler in place. This looks like a pin and screw combination. The schematic shows it should be on bottom side of the lock tumbler. Look for the screw at the 2 o'clock position which it sounds like you have already removed.

I would trying jiggling the assembly with the key in it in run/start position, there should not be anything else holding it in place.

Posted on Jun 02, 2009

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0900c15280266a39.gif

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  5. 0900c15280266a33.jpg
  6. enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 1: Lock cylinder drill point on 1974-77 Dasher


0900c15280266a34.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 2: Lock cylinder drill point on other models

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