Cylinder Head Assembly

CYLINDER HEAD








Follow the steps below to tighten the cylinder head bolts using Tool, in the numerical order as shown.
- Apply new engine oil to the threads and the seating surfaces of bolts.

CAUTION:
- If cylinder head bolts are re-used, check their outer diameters before installation. Follow the "Outer Diameter of Cylinder Head Bolts" procedure.
- Check and confirm the tightening angle by using angle wrench or protractor. Avoid judgment by visual inspection without the tool.






Re-usability

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 the bolts with new ones.

Limit (d1 - d2) : 0.23 mm (0.0091 in) or less

If reduction of outer diameter appears in a position other than d2, use it as d2 point.



Surface Variation

CYLINDER HEAD DISTORTION





At each of several locations on bottom surface of cylinder head, measure distortion in six directions.

Limit : 0.1 mm (0.004 in) or less



Camshaft Bearing Cap Torque & Sequence





Tighten camshaft bracket bolts in four steps in the order as shown.








Intake Manifold Torque & Sequence

Specifications



Exhaust Manifold Torque & Sequence

Specifications



Camshaft Gear/Sprocket Torque

Specifications