Cylinder Head

Cylinder Head











Tighten the cylinder head bolts in six steps in the order shown.

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

NOTE: Apply new engine oil to the threads and the seating surfaces of cylinder head bolts.

Cylinder head bolts
Step 1 50.0 Nm (5.1 kg-m, 37 ft. lbs.)
Step 2 60° clockwise
Step 3 0 Nm (0 kg-m, 0 ft. lbs.) (loosen)
Step 4 34.3 - 44.1 Nm (3.5 - 4.4 kg-m, 26 - 32 ft. lbs.)
Step 5 75° - 80° (target: 75°) clockwise
Step 6 75° - 80° (target: 75°) clockwise

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 inch) 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.
Standard 0.1 mm (0.004 inch) or less