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broken bolt inside block... bolt was holding bracket holding thermostat to engine... 700 1990

posted by  rstarkie on  Sat Mar 1 12:52 CST 2003
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last visit: Fri Oct 24 10:14 CST 2014
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I am not familiar with the setup, but it sounds like this is a stud that is screwed into the head and then a nut is used to make the seal on the thermostat. Easy outs are great when they work as designed. It is necessary to drill in the center of the stud. If enough stud is exposed you can begin by filing the surface flat and carefully using a center punch to produce a starting point for your drill. The real problem arises when you break an easy out off. They are hardened and extremely difficult to remove when broken off. Use common sense on how much force you think the easy out can withstand before it might break. Buy quality easy outs- the no-name Chinese ones will probably be trouble makers.

You might explore the possibility of drilling out the stud and tapping the resulting hole if it is just slightly bigger than the current stud. You might find a fractional size that would be a little bigger than the current metric. Good luck.

Randy






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