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The keyed cylinder on my truck completely broke. It had been that it was so loose you could remove the key while the truck was running. When it broke my girlfriend could not turn the engine off. She had to pull a relay and disconnect the battery. I've replaced the cylinder and it operates as it should EXCEPT, it doesn't turn off the engine. My cylinder is the old style.
What else may have broke that is operated by the keyed cylinder.
Thanks, john
The ignition switch is operated by a steel pushrod connected to the 'inner' end of the lock cylinder. The rod may be bent, the ignition switch itself, further down the steering column, may be damaged, or the lever/bellcrank the lock cylinder & key rotate may be damaged.
The details of the design may vary from the above, but you can or should be able to remove the steering column cover(most times 3 philips screws from underneath) and inspect what is/is-not working. The operation should be visible with the cover removed.
If the replacement lock cylinder fit properly into the column recess, and the 'tab' on the end lined up with the mechanism built into the housing, then it should work.
I think I would remove the lock cylinder once again, and inspect the position of the slot that the lock cylinder tip goes into. If the slot is worn, get something to shim it up. If misaligned, the key may not move the switch internally far enough.
You need to look for a mechanical problem in the linkage, starting wherever you prefer.
tom
With the housing off of the column it looks like the actuator rod(?) that connects the key cylinder to the starter switch is broken. When you turn the key it will start the truck but when the key is turned back it does not retract the lower part of the rod. It looks to have broke about where the steering column pivots.
Update. It was an undertaking to repair. The pin connecting the two parts worked its way out after 238k miles. To repair it I had to remove and disassemble the column. To say it was a PITA is an understatement. I went to a local U pull it yard and yanked a column to take a part first so I could learn what and what not to do. Took a lot of pictures and wrote Things down as I took things apart. Still managed to make some mistakes. Here are a couple of pics of the offending part from the junk yard column.
