Re: Running on Three Cylinders
Although I doubt that the spring broke (this would have shown up when checking clearances), it's quite possible that some carbon has dislodged and caught between the valve and the seat.
With the cam cover off, the follower located at the center of the cam base circle (lobe pointed straight up), take a hammer and a punch (preferably a soft punch, even a hardwood dowel) and smack it forcefully, several times.
If this can be done, with the air hose attached to the spark plug hole, it will be more effective.
Exhaust valves and seats, do burn occasionally, but not real often on Crosleys, and it's not an all at once thing. The exhaust valves were made of good material. Numbers on and four, exhaust seats, are prone to recession and burning, due to poor coolant circulation and cooling.
I hope that this helps, it's my best long distance, diagnosis for now.
On 11/1/2019 6:32 AM, Barry Smedley wrote: