I tried to remove my big bumper today to swap it for a new one.
Three of the bolts came out fine, but the left hand bracket had broken and corroded away to almost nothing. The bolt furthest inside the chassis leg was spinning freely, and it turns out that the nut was spinning around with what was left of the bracket.
Luckily because the bracket has broken, the bumper is off and out of the way, so I can see right inside the chassis leg.
The nut looks deformed too. I tried to get a 17mm spanner and socket onto it, but it wouldn't go on. A 16mm went on just about, but slipped when I tried to put any serious torque through it.
I had a go at trying to get the mole grips over it, but they were too big to fit over the nut or remains of the bracket inside the chassis leg.
I'm trying to think of ways to get it off, and have a couple of things to try...
-Get some long nose grips and clamp around the nut and/or bracket to hold it steady while I turn the bolt
-Wedge the breaker bar used for the bolt against the wheel to stop it turning (it's a long breaker bar), and use a long and thin chisel and hammer on the nut
-Grind the bolt off (though there is no power in the garage)
Anyone got any other creative ideas?