I'm not so sure about that, the original factory domed plug on the
intake manifold of my BJ8 has always been domed outward, but then
again it is an aluminum manifold...
On 7/1/11, Editorgary at aol.com <Editorgary at aol.com> wrote:
> In a message dated 6/30/11 11:29:03 AM, healeys-request at autox.team.net
> writes:
>
>
>> Hi
>> Has happened to me too, on my newly restored Sprite engine. I thought I
>> had hit the plug enough, but apparently not. Installed a new plug and
>> gave it a couple of good smacks, and the others too, and they have held
>> on ever since (7 years ago). Doomed plugs, you have to hit them in the
>> centre so they expand in to hole. If you hit them correctly they will be
>> impossible to remove without destroying I think.
>>
>> Per
>>
>
> I'd stick with original design, but silicone or even JBWeld is not a bad
> idea -- I've lost them on my MGA before. According to my mechanic, the trick
> is to start at the center and then pound in increasing circles out towards
> the edge of the plug -- I use a six-inch socket extension. Lots and lots of
> little taps. When you're done, the plug should be domed inward, not just
> flat.
> G.
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