It may help to get a socket and breaker bar on the bolt head and get the bolt to turn, breaking the bolt free from some of the corrosion. As Tom suggested, loosen the motor mounts to relieve any bind that might be there.
This is the reason I suggested having a 14mm die on hand, in case the threaded bolt end gets boogered beating it out. Some come out as easy as a wheel axle, others are as hard as Chinese arithmetic.
“many a trip continues long after movement in time and space have ceased”- Steinbeck, [I]"Travels with Charlie"
[FONT="Century Gothic"][I]Sometimes your only available transportation is a leap of faith[/I] [/FONT]