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1987 944 Turbo Rear shock removal

Suspension

Vehicle Information: Model(924/944/968): 944 Turbo; Year: 1987; Body Type: Coupe; Total Mileage: 99,300;

Is there a special technique for removing the bottom mounting bolt on the rear shock absorbers. The top nut and bolt released easily after spraying with penetrating /rust spray as both the head and the nut and threads could be sprayed. However the bottom bolt will not move after several applications of spray over a several day period. As you know the bolt passes thru the shock and threads into the suspension which is aluminium ( I am guessing since a magnet won't stick to it). I am suspecting the problem is the penetrating solution is not reaching the threads passed the shock absorber bushing. I have been using an air impact wrench as I am afraid too much force with a conventional wrench will break the bolt. I am going to try soaking the bolt by placing a small pan around the bottom of the suspension that holds the bolt. I will have to custom shape it to fit the area but looks like it might be possible. Do you have any recommendations? Can heat be applied with a portable propane torch if I protect the surrounding components and apply it just to the bolt receiving area? Will heat damage the suspension arm?

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