Toyota 13507-31020 Chain Sub-Assy

To get rid of the timing chain assembly, began by taking off the driving belt and the tensioner followed by the removal of idler pulleys. Synchronize the engine to the top dead center and then un-loosen the crankshaft pulley, use right and appropriate tools to avoid scratching. After that, undo both timing cover bolts and the water inlet with the use of a new O-ring and gasket being disposed. Loosen the timing chain cover at specific times to avoid damage, and replace the old crankshaft seal without marring the bore. Make sure that the piston of the No. 1 cylinder is close to TDC, then align it if necessary. Secure the tensioner plunger in the retarded mode and unbolt the tensioner and the components of chain taking note of their position. Measure all parts to see if there is chain stretch and sprocket diameters and to check tensioners and dampers for signs of extreme wear. For unleashing, lock the tensioner plunger, fit the timing chains ensuring the yellow links are fitted in the timing marks, and fasten the sprockets. It is followed by the installation of crankshaft timing sprocket, idler sprocket and checking the positioning of the timing mark. The long timing chain should be set in its proper location with the links and timing marks interlocking; the tensioner then be locked and the timing chain cover fitted with new sealant. Lastly, return all elements back in the proper sequence, put the oil and the coolant back into the engine, connect the battery and power up the engine to check for any signs of leakage.

Some of the steps involved in the removal procedure include disconnecting the negative battery terminal, removing the drivebelt and alternator, taking off the valve cover and ABS actuator (if applicable), and more.

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.

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).

Install the long timing chain on the camshaft timing sprockets and crankshaft sprocket, ensuring all links are aligned correctly.

Ensure that the yellow mark links on the timing chains are aligned with the timing marks on the camshaft timing sprockets and bearing caps.

If you're working on a 4WD model, the front axle/differential assembly will have to be removed.