Cylinder Head Bolt Torque and Sequence

Cylinder Head






Check that the nominal length of each cylinder head bolt meets the limit.
If it exceeds the limit, replace the bolt with a new one.
Limit (A) 99.4 mm (3.91 inches)
Apply a small amount of engine oil to the thread of the bolts and to the washers.






Use special tool MB991654 to tighten the cylinder head bolts as follows:
Tighten the cylinder head bolts to 78 ± 2 Nm (58 ± 1 ft. lbs.) in the order shown.
Loosen the bolts fully in the reverse order of that shown.
Tighten the cylinder head bolts to 20 ± 2 Nm (15 ± 1 ft. lbs.) in the order shown.






Apply a paint mark to the heads of the cylinder head bolts and cylinder head, then tighten 90 degree angle as shown.

Caution: The bolt is not tightened sufficiently if the bolt is tightened less than 90 degree angle.

Tighten the bolt an additional 90 degree angle as shown. Then check to see that the paint mark on the head of the cylinder head bolts and the paint mark on the cylinder head are aligned.

If tightening the bolt 90 degree angle results in moving the paint mark on the bolt past the paint mark on the cylinder head, remove the bolt and start over from step 1.