Lexus 13523-20020 Pulley, Camshaft Timing

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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.

This timing system is complicated, and if an individual get it wrong the engine is severely damaged and for this reason, it is recommended that only people with advanced mechanical knowledge should undertake this procedure, and if there is any doubt in ones ability, one should seek assistance from a professional mechanic. The procedure is best done with the engine and transaxle assembly removed from the vehicle, so this is suggested. Start with the engine/transaxle assembly then demount the drivebelt and tensioner and lastly the idler pulleys. With the engine at TDC, torque converter Locked and disconnected from the starter, remove the crankshaft pulley is carefully for avoiding damage using proper tools. Next, take off the valve covers and for some of the engine models, take off the timing chain cover bolts and the oil cooler assembly, if required renew the gaskets. Take off the water inlet and outlet and in some models of the engine, the mount bracket of the engine and camshaft timing control solenoids. After that, you have to take the timing chain cover off and having opened it carefully take out the previous crankshaft seal while staying attentive to different bolts in order not to mix them up. Check to ensure that the piston in the No. 1 cylinder is nearly at the T.D.C. position on its compression stroke, if not do crank the engine until the timing marks align. To disassemble the chain tensioner, turn the lock collar to the retracted position, then take out the chain tensioner slipper together with the squeeze-in vibration damper for the timing chain tensioner, and for some models, align the timing mark before removing the No. 1 timing chain but do not rotate the crankshaft during this process. Check also the wear and damage in all parts of the timing chain assembly, the timing chain stretch, the sprocket diameters as well as the oil clearances. Check that the chain tensioners work. During installation, ensure that turn the crankshaft by hand and you should feel some form of resistance, you should then lock the tensioner plunger and using the position of the yellow links and the timing marks, you run the timing chains and fit the chain guides. Crankshaft timing sprocket must be installed along with idler sprocket and the alignment of timing marks also needs to be examined. Once more take greater care to turn the crankshaft regarding the vin of car, take out the old RTV sealant, fit the new crankshaft oil seal and 'O' ring, and lastly apply the gray RTV sealant on the timing chain cover. Place the cover before its periods of validity expires to guarantee the proper sealing, and tighten tightly all the bolts in the correct manner; the procedure should be done in reverse to the removal process. Last but not the least, pour fresh oil and coolant into the engine, connect the battery terminals, and crank the engine to see if there is any leakage.

While preparing for timing belt removal, you should loosen the lug nuts on the right front wheel but leave them in place.

Remove the power steering pump from the engine without disconnecting the fluid lines, then tie it to the body with a piece of wire and position it out of the way.

Turn the stopper plate clockwise, push in the tensioner plunger, and insert a pin to lock it in the retracted position.

Rotate the engine clockwise at least two revolutions and reposition the number one piston at TDC on the compression stroke, confirming that all timing marks are aligned.

Yes, the sprockets are the same for either side