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Remove all the glow plugs or fuel injectors. Pour in “Marvel Mystery Oil” through each open plug and leave for 48 hours. Then try to spin the engine with the plugs/injectors still out.
For your edification. First schematic should help. Next should show you how to rebuild.
https://www.steelsoldiers.com/threads/how-to-bypass-pcb-i-am-aware-some-hmmwv-owners-have-done-it.182560/