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"the PT could have jumped out of the socket on the follower and is sitting between the valve and inj followers...not in the cup. I'd pull the box and have a look see." Easy to happen if the box is removed, the "suction" of the oil will cause the PT to stick to the lever adjustment screw and...

Threads sticking out of the lever. Normally there should be 2 to 3 threads protruding past the jamb nut. One valve, In or Ex, I forget which one, does have more protruding than the other, but all cylinders will be the same. If you have one cylinder with 5, 6, 8 threads on the adjusting screw...

There's your issue, Cummins has no rack!

How to check accessory drive timing. When you can go through 1/2 of the tune up process and the engine locks up, it usually means the timing is off or you have done it incorrectly. Top Stop, Adjust A, Inj 3, Valve 5. Put a socket with a 6 inch or so extension on it on the #3 injector jamb nut...

Accessory drive timing could be off, could have a beat in seat or a dropped seat. With the adjuster back in the lever, are there about the same amount of threads sticking out of the exhaust as the intake when the lever touches the cross head? If you remove the cross head, is one valve higher...