Re: Trouble - broken manifold bolt.

Posted by Fish'n Jim On 2018/5/27 11:26:18

Some of these come out and some don't and then drilling out is the only option. Another site told a guy to go to machine shop but they overdrilled and put a big threadsert in and messed it up, leaked coolant, so be careful.
I doubt you'll want to pull the motor for this. But may want to remove what's in the way, if a close quarter.
I'd take a small grinder and clean the breakage first as best as you can to get on/find center.
I like the reverse drill bits and square easy outs and lots of penetrant. I don't like heat on cast just my experience. Sometimes, if easy, the reverse bit takes it out alone.
I broke a spiral easy out off on one, and that presents a larger challenge and special carbide cutter to remove. Seems I get a better grip with the square, and lightly tap in tight before turning. One has to be careful to not bend or over leverage when turning. If it won't go small, go up next size and at worst, used the thread hole size bit from tap chart and pick out the remaining threads. Then chase threads.