Toyota 13080-31020 Gear Assy, Camshaft Timing Exhaust, LH

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To remove the timing belt, start by disconnecting the negative cable from the battery and removing the coolant overflow tank and windshield washer tank. If applicable, remove the front suspension upper brace from the strut towers. Then, remove the drive belts from the alternator and power steering pump. Loosen the lug nuts on the right front wheel and raise the front of the vehicle, supporting it on jackstands. Remove the right front wheel and inner fender apron. Position the number one cylinder at TDC and support the engine with a jack. 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. Rotate the crankshaft pulley counterclockwise 60 degrees BTDC and remove the timing belt tensioner. Relieve tension between the camshaft sprockets and remove the timing belt from the sprockets. If necessary, remove the camshaft sprockets and the upper idler pulley. Remove the crankshaft pulley bolt and remove the pulley. Remove the lower timing belt cover and slip the timing belt guide off the crankshaft. If reusing the belt, check for a mark on the belt adjacent to the drilled mark on the crankshaft sprocket. Remove the no. 1 idler pulley and plate washer using an Allen wrench. If needed, remove the crankshaft sprocket. Finally, remove the lower sprocket retainer.

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

Before embarking on the removal process, ensure you have the necessary special tools and equipment ready. To begin, disconnect the battery's negative terminal and proceed to remove the drive belt, alternator, valve cover, and ABS actuator if applicable. Afterward, raise the front of the vehicle with the right front wheel removed, and drain the cooling system. Carefully remove the power steering pump without disconnecting the fluid lines and secure it aside. Position the number one piston at TDC on the compression stroke, aligning the timing marks on the crankshaft pulley and camshaft sprockets. Subsequently, remove the crankshaft pulley/vibration damper, being cautious not to shift the engine from TDC. Support the engine using an engine support fixture and remove the passenger-side engine mount. Additionally, remove the drive belt tensioner and the crankshaft position sensor from the timing chain cover, including the bolt securing the crankshaft position sensor wiring harness. Proceed to remove the oil pan, the main wiring harness junction, and the timing chain tensioner from the timing chain cover. Unfasten the timing chain cover fasteners and pry off the cover. Slide the crankshaft position sensor reluctor ring off the crankshaft, then remove the timing chain tensioner pivot arm, chain guide, lower chain guide, and timing chain as a single assembly. The camshaft sprockets can be removed by loosening their bolts and using a wrench to hold the lug on the camshaft. Inspect all components for wear and damage, including the timing chain, sprockets, and chain guides, replacing any that fail inspection. Ensure the chain guides are within specified wear limits. When installing, clean the timing chain cover and apply RTV sealant before securing it in position with the original bolts. Reset and lock the timing chain tensioner to its "zero" position, lubricate the tensioner O-ring, and install it with the hook facing up. Reinstall the crankshaft pulley/vibration damper and set the chain tension by rotating the engine counterclockwise and allowing the tensioner to engage. Confirm TDC alignment and tighten the timing chain cover fasteners before proceeding with the reinstallation process in reverse.

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).

For the removal procedure, it's important to note that on 2010 and later models, the manufacturer recommends removing the engine and transaxle assembly to perform this complex procedure, which includes various steps involving disassembly, removal, and careful alignment of components such as camshaft sprockets and timing chain cover. This procedure demands a high level of experience and should only be attempted by those with extensive knowledge of such repairs; otherwise, consultation with an expert is advised. The process involves steps like disconnecting the negative battery terminal, removing the drivebelt and alternator, taking off the valve cover and ABS actuator (if applicable), and more. It also requires careful positioning of the number one piston at TDC on the compression stroke, verifying timing marks, and extensive removal of components, including the crankshaft pulley/vibration damper and timing chain cover. After inspection and necessary replacements, the installation process follows with careful reassembly and timing verification to ensure proper engine operation. Lastly, a crucial reminder is provided to rotate the crankshaft manually to check for any resistance before starting the engine to avoid potential damage due to incorrect assembly.

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).