Not Ranked
Whatever has happened here, more than likely the keeper grooves have been sheared off, ALL the springs need to come off to replace ALL the keepers.
At least one head may need to come off.
It is the grip of the keepers that holds the valve, and the taper match of the keeper to retainer.
You should be able to assemble a bare valve, retainer and a pair of keepers to stay locked in your hands.
If they can't, then something like this will happen.
If the rocker has kissed the retainer at anytime during valve operation, then the sudden non-centred load will shock the keepers loose.
Gary
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