Cylinder Head Bolt - 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 ones.

Limit (d1 - d2):............0.15 mm (0.0059 inch)

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