For the Toyota 1.8-liter 1zz-fe and 2zz-ge and many others with similar design, the intake camshaft valve timing is operated by a complex hydraulic mechanism. An Oil Control Valve (an electric solenoid contolled by the ECM) can advance and retard the position of the camshaft gear from the resting position of no advance to a position of maximum advance. This video covers:
How to disassemble the gear with or without penta-socket.
How the gear locks and unlocks with the locking pin.
How oil pressure controls the rotation of the gear.
The advance limiting pin.
How to reassemble the gear.
The vehicles equipeed with these engines are found in Toyota Corolla, Celica, MR2 Spyder, Pontiac Vibe, and Lotus Elise.
