Cylinder Head

Cylinder Head








Install cylinder head follow the steps below to tighten cylinder head bolts in numerical order as shown.

CAUTION: If cylinder head bolts re-used, check their outer diameters before installation. Refer to Specifications

Step a 98 Nm (10 kg-m, 72 ft-lb)
Step b Loosen to 0 Nm in the reverse order of tightening.
Step c 39.2 Nm (4.0 kg-m, 29 ft-lb)
Step d 90° clockwise
Step e 90° clockwise





After installing cylinder head, measure 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 the 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. Refer to Specifications

Using suitable tool, 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.