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Mart · 05-31-2015, 01:29 PM

I just did some calculations and if you can get some proper good quality bolts, it does sound like 12x1.25mm would be a good fix. If I were doing it this way I would do at least 2 bolts and might even do all 4. Don't drill out any holes in the crank as they are already above the minor diameter for 12x 1.25. You will have to drill the flywheel to 12mm.

Holding the tap square to the block might be a little tricky. Maybe drill the flywheel first then thap through. If doing it in vehicle it may be hard to ensure good alignment and removal of chips. They will just fall to the bottom of the bellhousing though, so no big deal.

You might be able to rig some sort of v block or something to hold the drill square.

Mart.

05-31-2015, 01:29 PM	#25
Mart Senior Member Join Date: May 2010 Location: Solihull, England. Posts: 8,747	Re: Stripped flywheel bolt I just did some calculations and if you can get some proper good quality bolts, it does sound like 12x1.25mm would be a good fix. If I were doing it this way I would do at least 2 bolts and might even do all 4. Don't drill out any holes in the crank as they are already above the minor diameter for 12x 1.25. You will have to drill the flywheel to 12mm. Holding the tap square to the block might be a little tricky. Maybe drill the flywheel first then thap through. If doing it in vehicle it may be hard to ensure good alignment and removal of chips. They will just fall to the bottom of the bellhousing though, so no big deal. You might be able to rig some sort of v block or something to hold the drill square. Mart.