Clean the surface of the cylinder head.
Put a straight edge (Item 1) [Figure 60-80-21] on the cylinder head.
NOTE: Do not put the straight edge across combustion chambers.
Put a feeler gauge (Item 2) [Figure 60-80-21] between the straight edge and the surface of the cylinder head.
Put the straight edge on the cylinder head’s four sides and two diagonal as shown in figure [Figure 60-80-22].
The maximum distortion of the head surface is ± 0,05 mm (± 0.002 in). If the measurement exceeds the specification, replace the cylinder head.
