Tightening torque, Nm
Cylinder head mounting bolts - 20 Nm + 165° ±6°.
You can reuse bolts if the bolt length does not exceed 118.5 mm (otherwise replace all bolts). Tighten the cylinder head mounting bolts with a torque wrench in the order shown in Figure 2.1.
Make sure all bolts are tightened correctly. Tighten the cylinder head mounting bolts (one after another) at 165° ±6°.
Note: To ensure proper tightening of the bolts, use a syringe to remove any remaining oil that may be in the threaded holes for the cylinder head bolts.
Caution: Do not lubricate new bolts with oil. When reusing bolts, they must be fully lubricated. No further tightening of the cylinder head bolts is required after this procedure.
Figure 2.1. Cylinder head bolt tightening sequence.
Original source on the website (OpelBook)
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