If stud No. 25 is equipped with a crab assembly, loosen nut No. 25 (1/4 turn) and torque to
420 lb-ft (570 Nm).
g. A second retorque must be done after the engine has acquired 50 hours. Torque by row and not by
sequence, marking relation of socket to cylinder head, back off 1/4 turn and bring to final torque or back to
original position, whichever is higher.
Figure 28. Sequence for Tightening Cylinder Head Nut.