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Old 30-07-2019, 20:19   #61
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Join Date: Mar 2013
Location: Boynton Beach, Florida. Cruising Bahamas through Spring 2023
Boat: Manta 40
Posts: 208
Re: Broke head off bolt.....need advice

Congrats - it happens to all of us. Not always easy... had a broken bold once cost me $400! Good lessons for us all.
1999 Manta 40
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Old 08-08-2019, 13:01   #62
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Re: Broke head off bolt.....need advice

I used a dremel and very carefully cut a small slice into the remaining screw and used a screwdriver to get it out.
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Old 09-08-2019, 18:36   #63
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Re: Broke head off bolt.....need advice

Retired machinist here......
1. File top of broken bolt to create a flat area 2/3 the size of the bolt.
2. carefully use a centerpunch to mark the bolt's center for drilling.
3. select a drill that is 1/8 " or bigger
4. Heat the area if it's an option
5. start your first drill while things are warm at medium speed and enough pressure to produce a chip.
6. correct the location if you happen to be slightly of center by angleing the drilll (no side pressure).
7. clear chips often.
8. use sulfur based oil or a wax candle to lube the drill (not lubricating oil which will decrease the drills bite).
9. If the bolt is short, drill through, reheat and fill with penetrating oil. (liquid wrench)
10. Heat again and open the hole to 2/3 bolt size.
11. soak with penetrating oil and insert a non tapered punch and start tapping with a light hammer. The shock waves will allow the oil to penerate more easily.
12. Lightly tap your easy-out to set it in the bolt. Hard taps will expand it!
13. Heat the area around the bolt while rotating the easy-out.
14. If this proves unsuccessful, you'll need to drill the bolt out to "just under ithe minimum diameter of the thread and chase the remaining threads out with a similar threaded tap.
15. If things get ugly and you destroy the threads, you'll need to use thread inserts to save the project.
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