Cylinder Head Torque and Sequence

General Specifications





INSPECT CYLINDER HEAD FOR FLATNESS
a. Using a precision straight edge and a feeler gauge, measure the surface contacting the cylinder block and the manifolds for warpage.
Maximum warpage:
Cylinder block side 0.05 mm (0.0020 inch)
Intake manifold side 0.08 mm (0.0031 inch)
Exhaust manifold side 0.08 mm (0.0031 inch)


Tightening Procedures

INSTALL CYLINDER HEAD SUB-ASSEMBLY

HINT: The cylinder head bolts are tightened in 2 progressive steps.

a. Apply a light coat of engine oil on the threads and under the heads of the cylinder head bolts.
b. Install bolts and plate washers to the cylinder head.

NOTICE: Do not drop the washers into the cylinder head.





c. Using a 10 mm bi-hexagon wrench, temporarily tighten each bolts in the several passes, as the sequence shown in the illustration, and fully tighten with specified torque.
Torque: 79 Nm (806 kgf-cm, 58 ft. lbs.)
d. Mark the front side of each cylinder head bolt with paint.





e. Retighten the cylinder head bolts by 90° in the sequence shown.
f. Check that the painted marks are now at a 90° angle to the front.