View Full Version : Broken rocker bolt

09-27-2008, 10:45 PM
I have a '92 Buick LeSabre 3.8 L with a broken rocker bolt on #6 cylinder. Can I drill and easy out the remaining part of the bolt and get away with not removing the head? Should I be reallyconcerned about the cause of the broken bolt? Does this happen often?
Thanks for your help on this.

09-29-2008, 05:55 PM
Blazerbuddy - If your going to try and drill it out make sure you can drill into the center of the bolt because its easy to damage the cylinder head. Heres a trick for you get a lefthand drillbit. Alot of times the broken bolt will back out when using these with very little effort.

09-30-2008, 03:35 PM
Spent several hours drilling with some left hand screw extractor drills from Sears. The bolt wasn't budging even if I jammed the drill bit to the side. I ended up using an easy out and carefully tapping it into the hole and the carefully twisting to removing the bolt. I had to devise a cardboard cover to catch the chips and a hole in it to access the bolt. When I drilled, I had magnets on the cover to pick up chips. I dragged the magnet around the head in case some chips fell around the valve springs. I took a few pics if anyone has any interest.

The local Buick dealer told me the bolt was discontinued. I found a local engine machine shop that ended up giving me a used bolt. I put it all back together, observing the torque specs (which seemed really low), started it, it runs great but now there is a loud tick. No miss, just a tick.

:confused:At this point I'm at a loss of what to do. Do I need to pull the rocker cover and run the engine and observe the rockers. Is there a way to test the valves w/o pulling the head?

Thank you again for your help

09-30-2008, 04:15 PM
BB - Glad to see you got it out. You can check the valves by doing a leak down test which uses compressed air and a gauge setup to measure the amount of leakage in a cylinder. The tick sounds like a lifter thats not pumped up. It may clear itself out if not you may need to replace it.