Hi Im working on a mineralli horizontal engine and trying to renew crankcase gasket...undoing the hex bolts behind stator and theres one where its worn. Am i best to drill it out? Also are they alloy or brass type? Thanks
is there any chance of getting a set of mole grips on it. if so soak it with WD40 first and leave it for a few hours, heating it with a blowtorch helps as well. though of course be careful not to heat anything that shouldn't be heated. and try to budge the bolt a little at a time. theres a reason why its worn if thats not possible or the bolt snaps, drill it as deep as the bolt goes with a drill 1 - 1.5mm diameter less than the bolt depending on thread depth maybe drill a pilot hole first. then re tap the thread.
Thanks for reply. I think my only 2 options are to try a little heat or drill it out. Sods law its tucked in the corner where mole grips wont even come close. Thanks
its a bugger trying to get the drill straight if your using a hand drill but make a good centre punch in the bolt head, then use a pilot. If its a last bolt, do you think you can get a bit of the shank after the case splits and you have drilled off just the head of the bolt
If you have sufficient access then I would first try to use a Dremel type tool with a cutting blade to cut a deep groove across the head which will allow to to try a flat headed screwdriver on it? The previous post sounds promising in so far as maybe drill/ cut the head off so the top half just comes off over the stub. You'll be left with the main bolt in the engine but with more room to work on that. Highly unlikely that its brass, far too soft.
