- Thread starter
- #21
Just broke one off up in there 
I thought this video was interesting

I thought this video was interesting
Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
This site may earn a commission from merchant affiliate
links, including eBay, Amazon, Skimlinks, and others.
drill out the hex bit? Or use a screw extractor? (with the latter you wouldn't really need to "extract" it but a tiny bitSo now the broken bit won't come out of the head ..any ideas on that?
The old Hammer has not affected it
Moar greaseInterestingly, my 2019 has 8mm flanged hex head bolts for the KDSS valves in lieu of allen head screws. I checked the FSM and sure enough, it says to use either a 5mm allen or 8mm socket when adjusting the valves.
View attachment 2486002
So now the broken bit won't come out of the head ..any ideas on that?
The old Hammer has not affected it
I live in West Hartford and may have to track you and that breaker bar down when it's time to crack the screws on my 13.I live in CT. My 08 LC was no issue. PB blast days before then used this setup. Leverage is your friend. Good luck
View attachment 2484328
It is a 5mm internal hex, many impact wrenches will probably do more harm than good.I’m curious because I’ve seen lots of posts about these seized bolts but I haven’t seen any mention of impact wrenches. Can I assume that a significant number of attempts were with impacts?
There is another trick that works well with electric/air impact guns, and that is to hold the socket by hand while trying to loosen it with the trigger.If you don't already have one, an "old school" impact driver can be quite helpful with stubborn screw heads. These are hit with a hammer/small sledge, and both are driven into the head of the screw/bolt, and twist CCW simultaneously. It is nearly impossible to strip the screw head using one of these, unless you're using the wrong sized bit. I almost always break this out when I see phillips or JIS screws. The one linked can accept 3/8" sockets, and is what I have.
It is, however, quite possible to break your 3/8" drive hex... Don't ask me how I know. This is where picking up some impact hex/allen drives is helpful:
Amazon product ASIN B000JOR0J6
When I loosened the valve screws on my '08, the impact driver was able to get one of them loose, however I did end up using an electric impact driver on the other one. By doing "bursts" and only allowing 3-4 impacts at a time while keeping eyes on the socket lettering to watch for rotation, I was able to just get the screw broken loose and then do the rest by hand.