I'm not aware of any bulletin as you describe although it may exist.
I would think compression would raise your cyl temp more efficinetly than water temp. Have you done a compression test?
Using a mech's stethoscope you should be able to hear which cyl is knocking easily enough, you may even be able to feel it; or crack open the metal fuel lines at the IP one at a time to the point of leaking and observe which affects knocking the most.
Have the delivery valves been done recently?
__________________
Terry Allison
N. Calif. & Boca Chica, Panama
09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)
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