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Old 30 November 2014, 16:01   #11
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Old 30 November 2014, 16:10   #12
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Bonzah! I'll call him tomorrow. Cheers Mick.
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Old 30 November 2014, 16:12   #13
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Bonzah! I'll call him tomorrow. Cheers Mick.

Pm sent
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Old 01 December 2014, 03:16   #14
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Dan

any descent engine over haulers will be able to sort that out the threads will be helli coils tapped into the Ali cast i suspect. i spent a lot of time years ago working on Coventry climax engines all Ali block and head [hillman imp] threads went regular.

good luck

regards jeff
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Old 01 December 2014, 03:49   #15
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Looks like one has enough of a head on it to get a pair of locking pliers on it. Smack it with a hammer a bunch, soaking it with a penetrating oil, and you might be able to get it out without heat. The smacking with a hammer "can" break the corrosion up enough to free it.

For the future, now that you know the feeling of when a bolt is going to break, stop and try smacking it, penetrating oil for a couple of days if needed, and heat before breaking them. It is far easy to deal with.

FWIW a good cobalt drill bit will drill stainless. Start small and work up bigger to stay on center.
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Old 01 December 2014, 05:10   #16
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If you're going to have to get some done by an engineering workshop I'd suggest you let them do them all. Not worth risking more damage.
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Old 01 December 2014, 08:18   #17
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If you're going to have to get some done by an engineering workshop I'd suggest you let them do them all. Not worth risking more damage.
My thoughts exactly.
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Old 01 December 2014, 12:01   #18
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Totally agree if your getting one bolt out at a machine shop might as well let them do them all

Lots of people think they know what to do but this is totally the wrong way to drill stainless:-

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FWIW a good cobalt drill bit will drill stainless. Start small and work up bigger to stay on center.
Drilling stainless you go for a small pilot drill then straight to the core dia of the thread.slow rpm & plenty pressure & lube ,doing it in stages you are asking for trouble either work hardening the bolt or snapping a drill in the hole
A good normal hss drill bit is perfectly adequate for stainless
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Old 01 December 2014, 13:58   #19
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Drilling stainless you go for a small pilot drill then straight to the core dia of the thread.
Since we said the same thing in different wording that means we agree on something
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Old 01 December 2014, 15:15   #20
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Since we said the same thing in different wording that means we agree on something
Your post read as if you work up in small steps but that is not the way when drilling stainless quite a common misconception
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