Cylinder Head

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.
Check and confirm the tightening angle by using angle wrench or protractor. Avoid judgment by visual inspection without the tool.





Step a 98.1 Nm (10 kg-m, 37 ft-lb)
Step c Loosen to 0 Nm in the reverse order of tightening.
Step d 39.2 Nm (4.0 kg-m, 29 ft-lb)
Step e 75° clockwise
Step f 75° clockwise





Tool number: KV10112100 (BT-8653-A)

Outer Diameter of Cylinder Head Bolts
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.

CYLINDER HEAD DISTORTION





Wipe off oil and remove water scale deposits, old gasket, old sealer, and carbon with a scraper.

CAUTION: Use care not to allow gasket debris to enter passages for oil or water.

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