I bought this Rover mower with a quantum engine on it. The Magneto was kaput so I replaced it and now it starts and seems to run fine but I noticed one of the head bolts had been snapped off and all the others were not tight enough. Still started fine though. The threaded portion remains in the engine block. The lower RHS corner bolt one is the broken one.
What do you think? Should I leave well enough alone or should I try and drill the remains out? The latter option is fraught with danger as the drill bit would rather drill the soft aluminium of the block than the hard steel of the bolt and all I have is a hand drill. So my preferred option is to leave it in and just tell the buyer that there is a potential problem.
Those bolts are pretty tough to drill out and I have found "Easy outs" a waste of money. There is about 20mm of threaded section left in the block.
