Toyota 13507-31020 Chain Sub-Assy

You can Select Your Vehicle to check if 13507-31020 fits your vehicle.

Prepare tools and disconnect the battery's negative terminal. Remove the drive belt, alternator, valve cover, ABS actuator, right front wheel, and drain the cooling system. Position the number one piston at TDC, aligning the timing marks. Remove the crankshaft pulley/vibration damper, passenger-side engine mount, drive belt tensioner, and crankshaft position sensor. Remove the oil pan, main wiring harness junction, and timing chain tensioner. Inspect all components for wear. Clean the timing chain cover and apply RTV sealant. Reset the timing chain tensioner to its "zero" position, lubricate the O-ring, and install it. Reinstall the crankshaft pulley/vibration damper and set the chain tension. Confirm TDC alignment and tighten the timing chain cover fasteners before proceeding with the reinstallation process in reverse.

This timing system is intricate, and one has to be very careful; any small mistake leads to the serious engine damage; thus this job should be carried out only by the experts and even the expert should consult any time he or she feels unsure. Start with the removal of the negative battery terminal, siphoning of the engine oil and coolant, removal of the battery, engine under-cover, the air cleaner housing, the radiator, the cooling fan, and the serpentine drive belt, removal of the upper intake manifold, ignition coils, the top of the engine block cover, miscellaneous, Variable Valve Timing sensor, dipstick and tube, power steering pump pulley without having to release the hoses Have the crankshaft pulley loosened but mind the symmetry before it is entirely removed. The next areas to be unbolted are the upper oil pan bolts, oil cooler hoses, radiator, water bypass hoses, Water inlet, and Timing chain cover being cautious not to harm the sealing plane. Get the No. 1 cylinder TDC of the compression stroke, fasten the tensioner to remain in the retracted state, and unlock the idler assembly, slipper component, amplitude dampers, and No. 1 cylinder timing chain without turning the crankshaft. Record all the wear and damage on various part of the car, measure the timing chain stretch on sprockets and the idler sprocket oil clearance, check the timing chain tensioners for wear and correct functioning. In installation, you need to position the crankshaft to some degree, lock the tensioners, properly align the timing chains with the sprockets by aligning their marks, and tighten all parts to the right measure of torque. To perform these operations, position the crankshaft as such to align all the timing marks, turn the crankshaft using your hands to assess resistance; shear off the old RTV sealant; lubricant, insert a new crankshaft oil seal and O-ring; spread the gray RTV sealant on the timing chain cover; and install the timing chain cover as soon as possible. Last, put the timing chain Cover bolts, oil pan bolts and end the procedure in a reverse manner, adding the oil and coolant, connecting the battery and cranking the engine to look for any leakage.

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.

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).

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

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

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).

Remove all old RTV sealant from the gasket mating surfaces and install a new crankshaft oil seal.

Replace the chain guides if scoring or wear exceeds acceptable limits.

Apply gray RTV sealant in all areas where the cover seals to the engine block and oil pan.

Disconnect the cable from the negative terminal of the battery.

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