Rear engine mounting bolt stuck

Hi, I am stripping down an Fj600 1984 US model ( same as xj600 ) project restoration and I am having grief trying to get the rear engine mounting bolt out , the nut came undone easily enough, but the bolt just wont budge, it does rotate with a socket but even with the biggest hammer and punch , it wont come out, the end D washers and bushes go round when turning the bolt but I have managed to wedge them to stop them rotating . The middle spacer tube is a harder one to clamp though , I have tried with one mole grip clamp , but the spacer still spins round when I turn the bolt with the socket, maybe I will try 2 mole grip clamps , I have flooded it with wd40 , I havnt tried heat yet . I am assuming that the bolt has just corroded its self to the spacer tube and rubber engine mounts . any other ideas ????
Also is the only way of getting the air box out , by removing the engine ????
cheers, Neil.

 

Lift up on the engine a bit with pry bar. I had to do that on my 81 xj650. Slide the bar between the case and frame and take the weight off the bolt and it slid right out.

 

yippie, got it out at last, only took 1 1/2 hrs , blood and sweat etc, very rusty . push pull , bang bang, twist bang etc , got there in the end .