Mechanical (4HK1) 1B-15 1. Overheat switch 2. Engine coolant temperature sensor 3. Remove the idle gear C from the cylinder head assembly. 8. CMP sensor removal 1. Remove the CMP sensor from the cylinder head assembly. 1. Idle gear C 2. Idle gear shaft 10. Valve spring removal Caution Be careful not to subject the sensor to shock. 1. Press the valve spring using the special tool. 9. Idle gear C removal 1. Press the idle gear C cover using the driver. Note Lightly tap the outer perimeter of the cover using a screwdriver and tilt the cover. SST: 5-8840-2621-0 - valve spring replacer 2. Remove the idle gear C cover from the cylinder head assembly using the pliers.