broken bolt extractor - Toyota Yaris Forums

dragoonmc · 09-30-2012, 09:58 PM

So I changed my sparkplugs a while back and almost broke 2 bolts tightening down the coils.
well yesterday I double checked they were all tight and broke one off in the head. So I grabbed a screw extractor and drill bit and got the screw extractor in and then it broke.
I spent probably 2 hours trying to drill a hole for the bigger (correct) size screw extractor but that just wasn't working with how much harder the broken extractor was. I eventually ended up getting out the dremel and grinding the hole back centered and then grabbed a carbide tipped drill bit intended for glass. This ate right through the extractor and got me a nice hole for the correct screw extractor to bite into and the bolt came right out.

So lesson is use a carbide tipped bit if you break a screw extractor in a bolt.

WeeYari · 10-01-2012, 07:12 AM

Quote:

Originally Posted by dragoonmc

So I changed my sparkplugs a while back and almost broke 2 bolts tightening down the coils.

WTH? How tight did you think they had to be? Those should be barely past snug.

Lesson learned is use proper torque amounts for bolt/application.

CoryM · 10-01-2012, 01:31 PM

I'm surprised that you were able to cut the broken extractor with a drill bit. Usually it's game over at that point. Did it actually drill a hole into the extractor or just kind of break it?

09-30-2012, 09:58 PM	#1
dragoonmc Drives: 07 hatchback Join Date: May 2012 Location: Illinois Posts: 118	broken bolt extractor So I changed my sparkplugs a while back and almost broke 2 bolts tightening down the coils. well yesterday I double checked they were all tight and broke one off in the head. So I grabbed a screw extractor and drill bit and got the screw extractor in and then it broke. I spent probably 2 hours trying to drill a hole for the bigger (correct) size screw extractor but that just wasn't working with how much harder the broken extractor was. I eventually ended up getting out the dremel and grinding the hole back centered and then grabbed a carbide tipped drill bit intended for glass. This ate right through the extractor and got me a nice hole for the correct screw extractor to bite into and the bolt came right out. So lesson is use a carbide tipped bit if you break a screw extractor in a bolt.

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10-01-2012, 01:31 PM	#3
CoryM Drives: 2009 5-door, 5-speed Join Date: Sep 2011 Location: White Rock BC Posts: 687	I'm surprised that you were able to cut the broken extractor with a drill bit. Usually it's game over at that point. Did it actually drill a hole into the extractor or just kind of break it?