Cylinder Head

Cylinder Head





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

CAUTION:
If cylinder head bolts are re-used, check their outer diameters before installation. Follow the "Outer Diameter of Cylinder Head Bolts" measurement procedure.

Step a 98.1 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 75° clockwise
Step e 75° clockwise








Apply new engine oil to the threads and the seating surfaces of bolts.

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

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)