Cylinder Head
Cylinder Head
Install cylinder head follow the steps below to tighten cylinder head bolts in numerical order as shown in the figure.
CAUTION: If cylinder head bolts re-used, check their outer diameters-before installation. Refer to "Cylinder Head Bolts Outer Diameter".
Apply new engine oil to threads and seat surfaces of cylinder head bolts.
Tighten all bolts.
Torque 98.1 Nm (10 kg-m, 72 ft-lb)
Completely loosen.
Torque 0 Nm (0 kg-m, 0 ft-lb)
CAUTION: In step "b", loosen bolts in reverse order of that indicated in the figure.
Tighten all bolts.
Tighten 34.3 - 44.1 Nm (3.5 - 4.4 kg-m, 26 - 32 ft-lb)
Turn all bolts 90 to 95 degrees clockwise [target: 90 degrees (angle tightening)].
CAUTION: Check the tightening angle by using angle wrench (SST). Avoid judgment by visual inspection without tool.
Check tightening angle indicated on angle wrench indicator plate.
Turn all bolts 90 to 95 degrees clockwise again [target: 90 degrees (angle tightening)].
After installing cylinder head, measure the distance between front end faces of cylinder block and cylinder head (left and right banks).
Standard 14.1 - 14.9 mm (0.555 - 0.587 in)
If measured value is out of the standard, re-install cylinder head.
Cylinder Head Bolts Outer Diameter
Cylinder head bolts are tightened by plastic zone tightening method. Whenever the size difference between "d1" and "d2" exceeds the limit, replace them with new one.
Limit ("d1" - "d2") 0.11 mm (0.0043 in)
If reduction of outer diameter appears in a position other than "d2", use it as "d2" point.
Cylinder Head Distortion
NOTE: When performing this inspection, cylinder block distortion should be also checked.
Using scraper, wipe off oil, scale, gasket, sealant and carbon deposits from surface of cylinder head.
CAUTION: Do not allow gasket fragments to enter engine oil or engine coolant passages.
At each of several locations on bottom surface of cylinder head, measure the distortion in six directions.
Limit 0.1 mm (0.004 in)
If it exceeds the limit, replace cylinder head.