Toyota 13523-0D010 Gear Or Sprocket, Camshaft Timing

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The VVT system used in all models include an intake camshaft timing that is controlled by oil pressure to either advance or retard the intake camshaft sprocket/actuator assembly for improvement of the engine power output, fuel economy, and reduction of emissions where these conditions prevail. They include the PCM, VVT oil control valve, the filter for the VVT oil control valve and the intake camshaft sprocket/actuator. Using a number of sensors, the PCM decides the oil control Valve to regulate the pressure of the oil to the actuator assembly. The actuator hydraulically driven contains an inner hub equipped with the fixed vanes and through the oil pressure the rotation of the camshaft is performed related to the adjustment through which the camshaft can be in advance to 21 degrees, or in case necessary-to be in a neutral state. Dependent on the load on the engine, the system can control the cam shaft timing in order to provide the right combustion. Especially, VVT oil control valve and the filter should be frequently maintained due to most problems root cause from them. To diagnose, the strainer of the oil control valve filter should be free from blockage, the valve's resistance would then be evaluated; if this has exceeded the allowable limit then it must be replaced. The second examination entails observing the movement of the plunger of the oil control valve every time voltage is supplied. As for the camshaft sprocket/actuator assembly, the valve cover and the camshaft have to be taken off; the actuator is then cleaned and it has to be installed correctly with the functionality as well. It is recommended to test the rotation of the actuator using air pressure and if it fails to do so, one must replace the assembly. Disassembly is the process of taking apart the equipment while reassembly is done systematically in a backward way to the process of disassembly.

To begin the removal process, start by disconnecting the negative battery cable and ensure the rear wheels are blocked while the parking brake is engaged. Loosen the lug nuts on the right front wheel, raise the vehicle, and securely support the front on jackstands. Proceed to remove the right front wheel and fender apron seal. Following this, remove the coolant overflow tank and the spark plugs and drive belts. Take out the alternator and its bracket and support the engine from beneath with a jack (using a wood block to avoid the oil pan drain plug). Remove the right engine mount and engine support rod. Afterward, remove the upper timing belt cover screws and pull up the wiring harness, then remove the upper (no.timing belt cover and gaskets. Ensure the number one piston is at TDC on the compression stroke and verify alignment between the small hole in the camshaft pulley and the TDC mark on the cam bearing cap. Optionally, apply match marks on the sprocket and belt if reusing the timing belt. Loosen the upper (no.idler pulley set bolt and unhook the spring to slip the timing belt off the sprocket. If the camshaft sprocket requires removal, hold the rear camshaft with a wrench and remove the bolt. Remove the crankshaft pulley bolt, secure the engine from turning, and use a breaker bar and socket to loosen and remove the pulley. Proceed to remove the lower (no.timing belt cover and gaskets, slipping the belt guide off the crankshaft if needed. If reusing the timing belt, apply match marks on the sprocket and belt. Slip the timing belt off the sprocket and remove it. Inspect the idler pulleys for smooth operation and the spring for damage, and assess the belt for cracks, wear, or damage. Replace the timing belt with a new one if wear or damage is evident or if there are concerns. When installing the new belt, ensure the timing marks on the camshaft and crankshaft are correctly aligned. Reinstall idler pulleys and the tension spring, check timing mark alignment again, and fit the timing belt onto the appropriate components. Slip on the belt guide with the cupped side facing out and reinstall the lower timing belt cover and crankshaft pulley, verifying TDC marks. Place the timing belt over the camshaft sprocket while maintaining tension on one side, loosen the upper idler pulley bolt, and allow the spring to apply pressure. Slowly turn the crankshaft clockwise until the marks align correctly, then tighten the idler pulley. Rotate the crankshaft two revolutions and recheck the timing marks. If they align as required, reinstall the remaining components in reverse order, paying attention to gasket material on covers if necessary. Finally, run the engine to verify proper operation.

The initial steps include removing the engine/transaxle assembly, the drivebelt, including the drive-belt tensioner and idler pulleys, and setting the engine to TDC (Top Dead Center).

The WT system is used on all models to vary intake camshaft timing.

Components such as the crankshaft pulley/vibration damper and timing chain cover need to be removed during the procedure.

Replace the chain guides if scoring or wear exceeds the specified amount.

Apply a bead of RTV sealant to the timing chain cover sealing surfaces, place the cover in position, and install the bolts.

If needed, remove the crankshaft sprocket.

Positioning the number one cylinder at Top Dead Center (TDC) is important because it sets the engine in the correct position for timing belt removal and installation.

Before beginning, make sure you have the necessary special tools and equipment ready. Disconnect the battery's negative terminal and proceed to remove the drive belt, alternator, valve cover, and ABS actuator if applicable.