> <<<<There is another method - get a welder to fill in the original hole,
drill
> and tap. I think I would trust that more than a helicoil, especially on
> something that's proven to be a critical component.
> Cheers, Mark.>>>>
>
> Mark,
> I think that welding may be unwise. Helicoil inserts are well proven
> technology and made with excellent material, they are very durable. The
> finished internal threads in place are very good quality and stronger than
the
> original.
>
> Drawbacks to welding include finding a welder competent to weld aluminium
> alloy and also the heat affected zone from any welding will affect the
> properties of the parent material. Sounds dodgy to me. Alternatively, one
> could buy a new cylinder head. This is important stuff and a little
investment
> is better than one's neck.
I understand what you're saying and I know it does effect the properties of
the area that's being heated up. I've only ever had it done on motor bikes
which are a much higher stressed engine, but then the engine on a motor bike
isn't so important to one's safety.
Cheers,
Mark.
________________________________
Mark Jackson - +44 (0)7050 645590
europa-builder@ntlworld.com
http://harley.pcl.ox.ac.uk/~mark/Europa
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