1AZ-FE ENGINE MECHANICAL ENGINE ON-VEHICLE INSPECTION DRIVE BELT COMPONENTS ON-VEHICLE INSPECTION REMOVAL INSTALLATION VALVE CLEARANCE ADJUSTMENT TIMING CHAIN COMPONENTS REMOVAL INSPECTION REPLACEMENT INSTALLATION CYLINDER HEAD COMPONENTS REMOVAL DISASSEMBLY INSPECTION REPLACEMENT REASSEMBLY INSTALLATION REPAIR ENGINE ASSEMBLY COMPONENTS REMOVAL INSTALLATION ENGINE UNIT COMPONENTS DISASSEMBLY INSPECTION REPLACEMENT REASSEMBLY