When a valve seat is replaced it must be "pinned" in or it could fall out
at high temp. Sounds like that's what happened
On Wed, 20 Sep 1995 TRIFARI@aol.com wrote:
> My 100-4 wouldn't start. When ir did start, it missed. Then it almost
> died, making what sounded like backfires. When I got it back to the garage
> I investigated fuel, carb and electrics and everything seemed OK. Then I and
> a friend who had been called over as a consultant, pulled the rocker cover
> and discovered a jammed exhaust valve. We pulled the head and discovered that
> the valve seat had come loose and had jammed under the exhaust valve. There
> appeared to be no damage to the other seats (examination pending). I have
> never heard of this happening, nor has anyone else I've talked with. Head
> work was done 5000 miles ago (head decked); valve was replaced about 25000
> miles ago in 1991. Any thoughts on why this happened? thanks John Trifari
> 1955 BN1/1980 MGB
>
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