i have a .30 Nosram and one of the 4 hex bolts in the cylinder head has rounded itself off. I can get the other 3 out, but the 4th one has rounded off and just doesnt move
A torx bit can usually get some purchase where a hex won't. Pick a size which is nice and tight and use some heat on the area too. If that fails then you have to drill the bolt head and use a very small ezy-out.
i have a .30 Nosram and one of the 4 hex bolts in the cylinder head has rounded itself off. I can get the other 3 out, but the 4th one has rounded off and just doesnt move
I just bought a bulk lot of engines and needed to drill out about 20 of the bolts, quite easy, if it's a 3mm bolt just hold it flat and square in a vertical drill and use a nice sharp 1/8th (3.2mm) drill bit and carefully drill the head off, it will break loose and stay on the drill bit, then lift the head off and undo the 'stud'.
BB
I had this happen on one of my OS engines, I just grabbed a cobalt drill bit and could use a cordless drill to take off the tops of the screws. These screws were sunken also.
I could then take the cooling heard off and unscrew the stub with some pliers.
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