Clean the bolt and look for a lockign device. if you see none there is none. try some pb penetrating oil if that odnt work get a mapp torch and heat up the bolt pretty hot almost before cherry red and wait for it to cool down back to regular color then use the wrench watch out it is very hot. do not use the torch near the gas lines unless you put up a shield for the heat.

Answered by blackop555 (expert)
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