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Looking for guidannce - six stubborn bolts on crankcase

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McCabe-Thiele (Ted):
Before I break a bolt or mangle the 12 mm heads looking for guidance as to how to remove these six bolts that have so far resisted my efforts.

1. I have sprayed with Plus Gas A after wire brushing heads.
2. Impact driver has not budged the last six bolts.

Any advice as to what to try next?


..stubborn bolts by Macabe Thiele, on Flickr

taysidedragon:
Try some heat. Don't melt the ally.
More plusgas and leave overnight.

McCabe-Thiele (Ted):

--- Quote from: taysidedragon on March 18, 2021, 05:39:30 PM ---Try some heat. Don't melt the ally.
More plusgas and leave overnight.

--- End quote ---

Good idea I have a basic plumbers blow torch so I will try heat from the bolt tops - then at least the plus gas might get past the bolt head when the paint has been burnt off.

K2-K6:
Put other bolts around there back in and torque them.

Then try just a little to tighten first to see if the bolt head is stuck rather than the threads. Literally to see if they'll move at all before reversal to undo if they yeald.

Bryanj:
Six sided impact socket and rattle gun, if they are that corroded into the alloy they willbreak no matter what you do

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