Exhaust manifold question
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Senior User
Joined: May 2006
Posts: 198
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From: Midpines Calif.
Exhaust manifold question
One of the exhaust manifold bolts broke while taking it out.Idrilled it out but the threads got messed up .After breaking two taps off what can i use to get the threads back in? Better taps??Ideas please !!
Hotshot
Joined: Jan 2001
Posts: 16,882
Likes: 3,126
From: SE Wisc. (the Rust Belt)
You might be able to use Helicoils:
Heli-Coil ( HeliCoil Inserts ) Helicoils Screw Thread Inserts | Emhart.com
Heli-Coil ( HeliCoil Inserts ) Helicoils Screw Thread Inserts | Emhart.com
Senior User
Joined: Dec 2007
Posts: 313
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This may be a stupid question but were you using any cutting oil while you were tapping? I've been a machinist for about 8 years and that makes a big difference. Turning the tap back a 1/2 turn every 1 or 2 turns will help brake the chip off and keep the tap from breaking. If it's beyond repair, you can use a heli-coil kit to get your threads back to what you need them to be. I don't know what the size or pitch of the bolts are but they normally run about $40 - $60 for the kit. I hope that helped some. Good luck with it.
