Toyota 13529-20900 Gear, Camshaft Sub

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Disconnect the battery and remove the coolant overflow, washer tanks, and front brace on Solara models. Remove belts from the alternator and power steering pump. Loosen lug nuts on the right front wheel, then raise the vehicle and remove the wheel, fender apron, and spark plugs. Set the number one cylinder at TDC and support the engine. Remove the engine movement control rod, upper timing belt cover, tensioner, and belt. Remove the lower cover, belt guide, and belt. For installation, clean the belt area and align the crankshaft sprocket keyway. Apply thread-lock to the lower idler pulley bolt, position the idler pulley, and install the belt. Attach the lower cover and fit the crankshaft pulley. Reinstall the upper idler pulley and front camshaft sprocket.

To remove the components, first disconnect the cable from the negative battery terminal, then remove the drive belt and the alternator. Next, take off the valve cover and the ABS actuator if equipped, ensuring to remove the three gaskets from the camshaft bearing caps on 2008 and later models. With the parking brake applied and the rear wheels blocked, loosen the right front wheel lug nuts, raise the front of the vehicle, and support it securely on jack stands before removing the right front wheel and splash shield. Drain the cooling system while removing the power steering pump without disconnecting the fluid lines, tying it to the body to keep it out of the way. Position the number one piston at TDC on the compression stroke, confirming alignment of the timing mark on the crankshaft pulley with the "0" mark on the timing chain cover and the camshaft sprocket marks with the marks on the camshaft front bearing caps. Remove the crankshaft pulley/vibration damper without rotating the engine from TDC, supporting the engine from above or below. Remove the passenger side engine mount and movement control rod, followed by the drive belt tensioner(s) and the crankshaft position sensor from the timing chain cover, along with the bolt securing the wiring harness. Detach the main wiring harness junction and remove the timing chain tensioner from the rear side of the timing chain cover, then pry off the cover after removing the fasteners. Slide the crankshaft position sensor reluctor ring off the crankshaft, remove the timing chain tensioner pivot arm/chain guide, and lift the timing chain off the camshaft sprockets, removing the timing chain and crankshaft sprocket as an assembly. For 2008 and later models, remove the movement control rod mounting bracket from the front of the timing chain cover, then remove the cover fasteners and pry off the cover. Remove the O-rings from the crankcase, the top chain guide mounting bolt and guide, and extend the tensioner plunger until a pin can be inserted into the alignment holes. Remove the mounting bolts and the timing chain tensioner, followed by the timing chain tensioner pivot arm/chain guide and the stationary timing chain guide. Lift the timing chain off the camshaft sprockets and remove the timing chain and crankshaft sprocket as an assembly. To remove the camshaft sprockets, loosen the bolts while holding the hex on the camshaft with a wrench, noting the identification marks before removal. Visually inspect all parts for wear and damage, checking the timing chain for loose pins, cracks, worn rollers, and side plates, as well as the sprockets for hook-shaped, chipped, and broken teeth. Measure the timing chain for stretching and the diameter of the timing sprockets for wear, replacing them as necessary. Check the chain guides for excessive wear and inspect the chain guide oil hole for clogging. For installation, remove all traces of old sealant from the timing chain cover and the mating surfaces, position the camshafts with the dowel pins at the top, and install both camshaft sprockets in their original locations. Ensure the TDC marks on the camshaft sprockets are aligned, install the stationary timing chain guide, loop the timing chain around the crankshaft sprocket, and align the No.1 colored link with the mark on the crankshaft sprocket. Slip the timing chain into the lip of the stationary timing chain guide and over the exhaust camshaft sprocket, then around the intake camshaft sprocket, aligning the remaining colored links with the marks on the camshaft sprockets. Remove slack from the chain and install the timing chain tensioner pivot arm/chain guide, ensuring the tab on the pivot arm can't move past the stopper on the cylinder head. Reconfirm that the number one piston is at TDC and that the timing marks are aligned. Install the crankshaft position sensor reluctor ring with the "F" mark facing outward, apply RTV sealant to the timing chain cover sealing surfaces, and install the cover with bolts in their original locations, tightening them evenly. Reload and lock the timing chain tensioner, lubricate the O-ring, and install the tensioner into the timing chain cover. Install the crankshaft pulley/vibration damper, rotate the engine counterclockwise slightly to set the chain tension, and for 2008 and later models, temporarily install the crankshaft pulley bolt and rotate the crankshaft counterclockwise until the keyway is pointing to the 10 o'clock position. Align the TDC marks on the camshaft sprockets, install the stationary timing chain guide, loop the timing chain around the exhaust camshaft sprocket, and align the yellow-colored link with the timing mark. Guide the chain into the stationary chain guide, align the crankshaft sprocket with the pink-colored link, and slip the timing chain around the intake camshaft sprocket. Rotate the crankshaft clockwise until the keyway is pointing to the 12 o'clock position, install the tensioner guide and mounting bolt, then install a new gasket and the tensioner. Confirm that the number one piston is still at TDC and that the timing marks are aligned, install the top chain guide mounting bolt and guide, apply RTV sealant to the timing chain cover sealing surfaces, and install the cover with bolts in their original locations. Tighten the bolts in sequence, install the movement control rod mounting bracket, and tighten the bolts. Finally, rotate the engine clockwise at least two revolutions and reposition the number one piston at TDC, visually confirming the alignment of the timing marks. The remainder of the installation follows the reverse of removal.

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.

From models manufactured in 2001, Variable Valve Timing (VVT) is incorporated in the assembly, with the control valve being affiliated to the oil system, the oil filter, or the intake camshaft sprocket/actuator of either cylinder head. The VVT system controls intake camshaft position by regulating the pressure of oil to improve torque, fuel consumption, exhaust emission. Part include PCM; the Oil control valves (OCVs); the oil filters; the intake camshaft sprocket/actuator. The PCM expends signal data from different sensors to regulate the OCV, which disseminates oil pressure to modify the position of the camshaft. Within the sprocket/actuator assembly, there is an internal hub with set vanes which is rotated with the help of oil pressure for the adjustment of up to 21°. In different loads of the engine, the system changes the camshaft timing to increase performance and more efficiency. Problems in the VVT system arise from the OCVs and filters requiring service often. Occasionally, certain OCV filters become clogged which can cause issues, that means the filter needs to be checked and preferably cleaned. It is necessary to check the OCV, for doing this you must measure the resistance across its terminals; if the value is out of the range it should be replaced. For replacement, unplug the electrical connector, and unscrew the hold-down bolt in addition to installing a new O-ring. The camshaft sprocket/actuator assembly thus needs to be well handled, s accepting that it must remain locked at idle conditions. Relatively, the advance side oil port if cleaned and subjected to air pressure, the actuator should move freely; if it fails to do so, replacement is mandatory. In case of replacing the assembly, make sure that the lock pin is aligned to the groove, lubricate the seating plane to the assembly, and use a new retaining nut which is retailed to be turned in the opposite direction. Last but not the least, replace back the intake camshaft, timing belt and finally the valve cover.

Inspect all components for wear and damage, including the timing chain, sprockets, and chain guides. Replace any components that fail inspection. Ensure the chain guides are within specified wear limits.

Remove the engine movement control rod and its bracket, as well as the spark plugs. Remove the upper timing belt cover and check for installation marks on the timing belt.

Remove the fasteners holding the timing chain cover and pry it off at the lower and upper corners only to avoid damage.

Carefully pry out the old crankshaft seal with a screwdriver, ensuring not to scratch the seal bore.

Apply thread-locking compound to the first two or three threads on the lower (no. 1) idler pulley bolt. Then position the idler pulley and washer and install the bolt. Tighten the bolt.

Remove the crankshaft pulley bolt and remove the pulley.

The coolant overflow tank, spark plugs, drive belts, alternator, engine mount, and engine support rod are removed to access the timing belt and related components.

After timing belt removal, you should inspect the timing belt tensioner for leaks and proper protrusion. Additionally, you should check the idler pulleys for smooth rotation.

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.