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Posted by Don Young on July 1, 2006, 12:03 am
> Noozer wrote:
>> I had a bolt break off in my aluminum engine block. I've been able to get
>> the broken piece out of the block, but the threads were damaged. Now I
>> need to repair this...
>>
>> The original bolt was an M8x1.25x100mm of #8 hardness. If I put a new
>> bolt into the hole, it does grab but is VERY loose and not suitable to
>> hold it's braket in place.
>>
>> I was hoping to find an M9x1.25x100mm bolt, but no luck. I then tried to
>> locate an 11/32"x4" bolt and again, no luck.
>>
>> So now I figure I can drill this hole out a bit and cut threads for a
>> 3/8"x4" bolt...
>>
>> Does this sound reasonable?
>>
>> My biggest issue is clearance. I had to use a 90' drill to get the broken
>> bolt out. There is almost no visibility to see if the hole is straight.
>> The bracket that mounts here does not have any critical tolerances.
>>
>> Suggestions?
>
> If it's that hard to access you might have a heck of a time trying to
> properly install a helicoil insert.
>
> If the bracket is not something you anticipate having to remove and
> replace often I'd give a try to using JB Weld to "glue" your new M8x1.25
> bolt into that buggered up hole.
>
> Use a Q-tip and solvent to clean out the hole and the new bolt threads as
> best as you can, then slap on some JB weld and drive the bolt in as tight
> as you dare to without stripping the hole.
>
> That's worked for me and it might for you too, and if it doesn't, you can
> start from scratch again.
>
> HTH,
>
> Jeff
>
> --
> Jeffry Wisnia
> (W1BSV + Brass Rat '57 EE)
> "Rudeness is the weak man's imitation of strength."
I often use Jeff's idea but use a separate stud and nut. After a good
cleaning, smear the hole and stud with JB Weld or similar epoxy and screw
the stud in until it bottoms out. Let it set up for 24 hours, install
washers as desired, install nut and tighten. It makes a stronger and
removeable connection.
Don Young
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