[DeTomaso] Motor Mount Bolts Sheered Off

[wkooiman at earthlink.net]

If you were able to get a drill in there, surely you can use a tap to carefully clean the threads.

Taps are used to cut threads in solid metal.  It shouldn't have a problem with threads that are "stuck" to the cast iron.

-----Original Message-----
>From: Michael Becker <mikebecker at cox.net>
>Sent: Aug 9, 2010 11:37 PM
>To: detomaso at realbig.com
>Subject: [DeTomaso] Motor Mount Bolts Sheered Off
>
>Both of the bolts attaching the motor mount to the block on the driver's
>side were sheered off on my car.  I'm not sure how long it's been like that,
>but this would seem to explain some vibrations I have been feeling during
>acceleration.  I removed the bolts holding the motor mounts to the frame and
>jacked up the engine a bit.  The first bolt was easily extracted using an
>easy out.  The second bold has proven to be almost impossible.  I ended up
>drilling several holes in the stuck bolt and finally it came out in many
>pieces and lots of metal dust.  Unfortunately, it appears as though many of
>the threads somehow cracked off the bolt and they seem to be lodged within
>the threads of the block!  It's almost as if the bolt threads are fused to
>the block.  I'm beginning to think that the bolt had been cross-threaded
>last time it was installed, causing the threads to weaken and crack upon
>forced extraction.
>
>Now I don't know what to do.  I can't re-cut the theads because it looks
>impossible to get the tap (or is it the die) in the mangled/obstructed hole.
>I could possibly drill it out and tap with a larger size.  The current size
>is 7/16 x 14.  I'm not sure how much bigger I could make the hole without
>compromising the block.
>
>Any suggestions?
>
>Thanks,
>Mike Becker
>(619) 804-3757
>
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