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Underneath the exhaust manifold there is a 13mm plug where the crankshaft stopper must be inserted. Use a wrench to remove the stud
Using the longer stopper, fully insert and screw it in until snug.
This will prevent the crankshaft from moving clockwise past TDC. With the stopper in place rotate the engine clockwise until it no longer turns. The crankshaft will be at exactly TDC.