OK, I have a problem
I’m in the middle of trying to do my valve clearances and I need to take the cam chain tensioner out before I remove the cam holders to get to the shims.
However, one of the head’s of the bolts that holds the cam chain tensioner to the engine block has rounded off meaning I can’t get it out.
I’ve tried using vice grips with no joy and am feeling pretty stuck as there isn’t much space to get anything else in because of the frame.
Any suggestions?
Thank you
im good at rounding them but not sorting it! Sorry
Im sure someone on here has a wicked technique. I do remember seeing a thread about something similar…
can you get a small acksaw blade in there and cut two sides of the boult,
so you can get a smaller spaner on it.
good luck
depending on the size, cct bolt probably isnt all that big but still farily tight, you may have luck using a hacksaw to cut a flat and use an impact driver to remove.
failing that, hammer on the next socket down, failing that irwin bolt remover thing (http://www.amazon.co.uk/Irwin-Bolt-Grip-Remover-394001/dp/B0000CCXVZ) failing that, angle grind the head off
i remember reading something similar too… try the search function 
Before you resort to hammers ,chisels, hacksaws etc etc. try to borrow a quality flank drive socket - Snap-On is a good bet and ,if it isn’t totally rounded off ,it will come out.
I think that judging by some of the answers on here there is a bit of confusion to whether the bolt is a Hexagon Head or a Socket Head (Allen Bolt)
AFAICR they are usually Socket Head Bolts and if so hammering a slightly bigger “Torx” bit into the head should give you a bit of grippage;)
If its hard to get in there as im shure it is bite the bullet now and take the motor out for a better chance of not needing a drill…
The bolt is hex head… 8mm ring spanner is all I could use to try and slacken it.I’m going to try the following - use a dremmel drill to cut the head off the bolt (there should be enough clearance to position the drill and get to the bolt from under the frame). This means I can then remove the cam chain tensioner (already got the other bolts out) which will leave me about an inch of the bolt sticking out, which I’m then going to double nut, which fingers crossed will let me get the bolt out.
