If the manufacturer's instructions do not state otherwise, which of the following progressions represent the best order for tightening the head bolts shown in the illustration? See illustration MO-0028.
⢠Typical practice for tightening cylinder head bolts when no manufacturerâs pattern is given ⢠How a crisscross / star pattern helps avoid warping the head and gasket ⢠Why tightening should progress from the center area toward the outside (or most evenly spaced points)
⢠Look at the physical positions of bolts 1 through 8 on the illustration. If you start at bolt 1, which sequence keeps you jumping to the bolt most nearly opposite each time? ⢠Which option avoids going around the circle in order and instead creates an alternating, balanced pattern across the head? ⢠For each choice, sketch the path on the circle: which one gives the most symmetrical âXâ or star pattern and keeps loads even on opposite sides?
⢠Verify that the chosen sequence never tightens several adjacent bolts one after another around the circle ⢠Check that each step moves you to a bolt that is roughly opposite or well separated from the previous one ⢠Confirm that the final pattern would pull the head down evenly without twisting it in one direction
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