Transmission pan bolt broke off inside

2010 CHEVROLET COBALT
100,000 MILES
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SETH7383873
  • MEMBER
  • 15 POSTS
I went to do a transmission filter change and while taking the bolts out one of them stripped and snapped off inside. I’ve tried drilling a whole into to try and get a bolt extractor to go in but it will not budge. I’ve also used penetration oil on it but cannot get it out.What else could I do to seal the transmission pan without that bolt?
Apr 23, 2020 at 9:26 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
You could use a form a gasket to help seal that area, but it may not last. Have you considered drilling the entire broken bolt out and then re-threading the housing and using a different bolt? That is what I would honestly be doing. If drill enough of the bolt out, it should come out. If that doesn't happen (as you mentioned) get a drill bit the same size and the bolt and drill it entirely out and tap new threads into the housing and then replace the bolt with the new size.

Let me know if I can help.

Joe
Apr 23, 2020 at 9:41 AM
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