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Massery Freguson 150 knock in top end

JR the nock sounds like its coming from the lifters but i can not see anything wrong with it can some one please help me please

GEEBEE Couple of possibles..leaking injector can cause a combustion knock also leaking Thermostart in inlet manifold, sticking valve that piston is hitting, piece of ring on top of piston ??
Jr Mull how would i tell if its any of these minus the broken ring on top of the piston i can figure that one out thank you so much for your help
GEEBEE Thermostart is a long shot but try disconnecting fuel and power supply, if that don't work take a length of 1x2 and place one end against engine put your ear to other end and move it around and see if you can narrow down the knock to one area or one cylinder. If you can turn engine by hand or have someone bump starter check for a valve that is sticking down.

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