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I want to thank everyone for there help. I did find pieces of the tappets in the oil pan. will proceed with repairs . thanks again.

where can I find lift info on the cam , the valves and springs all appear to be approx. same height, am I looking at removing engine to replace tappets ? or pulling cylinder head ?

the only three valves lash that seems normal are intake 1, 3, 5. I removed lift pump to make sure entire cam was turning, before I removed the valve cover noting that all push rods are moving.

I am sorry I did not start with all the necessary info. it is a M923A2 , 8.3 cummins, with auto trans. I have started over a hundred of these military trucks that have sat around. this is the first time I encountered this problem. I usually only use spray for a few seconds. the engine has...

I am not sure of engine, it has a turbo, the front cover has a tach cable coming out of it. I can get more info tomorrow. we were starting it on a can of starting fluid. it started and died a few times, then it revved out for about 10 to 15 seconds, it still had not picked up fuel. now it has...

I was starting a 5 ton, w a cummins, it started a few times, then revved out a little and now it has massive rocker clearance approx. 3/4 in.on eight or so valves...... what happened ?