Tap n' Die Questions - longish

[haygood@aemail4u.com (Haygood)]

If you try any kind of extractor again, get your wife or any female S.O. yo=
u might have to leave for a few hours, then put the head in the oven at som=
ething like 400 or even 500=C2=B0F for a while.  Aluminum expands more than=
 steel does, so heating it up will help the steel bolt come out of the alum=
inum threads MUCH more easily.  Did this with great success on my 2.0l head=
 recently.  Of course you should drill any pilot holes and have everything =
ready to go so you can try the extraction while everything is piping hot.  =
Oh, and don't burn yourself (or get caught!)!!!

If you do tap, go slowly and pull the tap out and clean it and the hole off=
 every 1/4 to half of a turn. Aluminum is easy to mess up.=20=20

--- Chris <vze28h54@verizon.net> wrote:
>If you end up drilling out the stud, the hole is going to be too big to ta=
p=20
>it with an 8M tap isn't it? Get the HeliCoil.  Do the oversize tap and=20
>insert the coil.  The coils seem to hold bolts in better than the original=
=20
>threads.  (Some of the coils are made to be "locking" by using a few=20
>irregularly shaped coils.  (Also, the Pegasus Auto Racing Prods catalog=20
>http://www.pegasusautoracing.com/  shows what looks like a new kind=20
>of  screw extractor and it says something like "after you are through=20
>breaking your "Easy Outs" use this tool.  I have not tried it so I don't=
=20
>know if it really works any better.
>
>Chris
>
>At 06:08 PM 03/02/2003 -0800, T Berk wrote:
>>(btw- pls edit out the top text when replying to this, I think the
>>Digest folks will certainly appreciate it.)
>>
>>I picked up a Hydro GTI head some time back, had the mating surface
>>flattened and found some time in it's past it had (at least once
>>before been a replacement.
>>
>>Trouble was it had an exhaust stud broken off just beneath flush and I
>>wanted to get the old steel out of the aluminum head before putting my
>>motor back together.
>>
>>I have had poor success (if you can call it that) with those reverse
>>thread screw extractor, after all the two different metals have galled
>>to each other, what with the heat and all, it's better I think to just
>>drill it out and re-thread.
>>
>>A friend loaned me a Helicoil tap but I realize it doesn't leave
>>thread ready for the stud, and I'd rather tap directly, besides I have
>>no coils at the moment anyway.
>>
>>Lucky for me I was able to locate an ala carte M8x1.25 metric tap
>>today at Orchard Supply.  :])
>>
>>So, I know you probably want to go over the basics with me (if you
>>would) and fill n the glaring blanks in my knowledge.
>>
>>- You want to go slow, maybe advancing only 1/4 turn each time.
>>
>>- You want to use some lubricating oil, somewhat like cutting oil.
>>
>>- You want to drill the pilot hole to xxxxx size for a metric 8 by
>>1.25 hole.
>>
>>
>>Thx and Keep a Rocc'n.
>>TBerk
>>Getting back to life, without Meds.
>>
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>
>
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