1B-12 Mechanical (4HK1) 22. Cylinder head assembly removal 1. Remove the cylinder head assembly from the cylinder block. Note Loosening order of the head bolts Caution Since the idle gear C protrudes from the bottom surface of the cylinder head, be careful not to damage the gear. 1. Idle gear C 2. Remove the cylinder head gasket from the cylinder block. Caution Do not reuse the cylinder head gasket.