Joe is quite correct when he said a runaway engine was nearly impossible to stop --It happened to me with a truck and it was horrendous
the engine went past max rev's and of the clock I couldn't get it out of gear and the brakes where red hot --In the end a rod went through the
side of the block and jammed the engine with such a force it tore it of its mountings --I hope no one experiences this .good Luck.
Frank