Cylinder Head Bolt Torque

CYLINDER HEAD TORQUE/SEQUENCE:





CAUTION:
- Always tighten cylinder head bolts at a 90 ° angle. If it is less than 90 degree angle, the bolt will loosen.
- If it is more than 90 ° angle, remove the head bolt and repeat the procedure from step 1.

Using special tool MB991654, tighten the bolts by the following procedure.
1. Step 1: Tighten all bolts in the order shown to 79 ± 4 Nm (58 ± 3 ft. lbs).
2. Step 2: Fully loosen all bolts in the REVERSE ORDER of that shown.
3. Step 3: Tighten all bolts in the order shown to 20 ± 2 Nm (15 ± 1ft. lb).





4. Step 4: Tighten all bolts in the order shown 90 ° of a turn. Mark the head of the cylinder head bolt and the cylinder head with a paint mark.

5. Step 4: Tighten all bolts in the order shown 90 ° of a turn. Check that the painted mark of the head bolt is aligned with that of the cylinder head.

CYLINDER HEAD BOLT RE-USABILITY:

Check the cylinder head bolt shank length. If the bolt length exceeds the maximum length, it must be replaced.

Cylinder Head Bolt Shank Length (Max.) 99.4 mm (3.91")

CYLINDER HEAD SURFACE VARIATION

Maximum Allowable Surface Variation .007"

Use a straightedge and feeler gauge to check the flatness of the engine cylinder head and block mating surfaces.