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Drivetrain => The Nailhead => Topic started by: brickwhite on April 28, 2021, 09:19:15 PM

Title: Thermostat housing broken bolt
Post by: brickwhite on April 28, 2021, 09:19:15 PM

What's the best method to remove a broken bolt from the thermostat housing.

-I'll try some heat, penetrating oil and vise grips first.. the move on the the welder....

Is the bypass is cast iron?

(https://i.imgur.com/DTq35ix.jpg)

the thermostat was pretty old and not closing/opening all the way.

(https://i.imgur.com/2hrmnnT.jpg)

Title: Re: Thermostat housing broken bolt
Post by: Loren At 65GS on April 28, 2021, 11:39:51 PM

Yes, it is cast iron. I would use my oxy acetylene wrench to cherry the bolt a couple of times allowing to cool between. Looks like there is enough to get a vise grip to grab onto. If not, weld a nut onto it and use a wrench. Copious amounts of penetrating oil is good too.

  Best of luck,
  Loren
 

Title: Re: Thermostat housing broken bolt
Post by: brickwhite on April 29, 2021, 12:11:14 PM

I had enough old bolt to weld a nut to the top, I broke the weld 2 times before it came loose.

Made sure I tapped both holes again before reassembly.

Thanks for the advice. I always hate drilling and tapping old bolts.

(https://i.imgur.com/yUvPQFb.jpg)

(https://i.imgur.com/BHIngwx.jpg)

(https://i.imgur.com/3jXDyLS.jpg)

(https://i.imgur.com/m78ZWDS.jpg)

Title: Re: Thermostat housing broken bolt
Post by: Loren At 65GS on April 29, 2021, 12:26:20 PM

 Excellent !  Happy to see it came out. I concur drilling broken bolts out, is not a fun task.
 We use to drill out so many exhaust manifold bolts when I was an Audi tech, I had a guide fixture that helped keep the bit centered and straight. Oh well, that seems like another life time. lol

  Loren

Title: Re: Thermostat housing broken bolt
Post by: GS66 on April 29, 2021, 05:34:57 PM

Had the same thing on a 401 water pump bolt.