Toyota 13507-31020 Chain Sub-Assy

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

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 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).

This complex procedure should only be attempted by those with extensive knowledge of such repairs or by consulting an expert.

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.