Toyota 13506-0S020 Chain Sub-Assembly, NO.1

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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.

There are access plugs for the timing chain tensioner on the left and right sides of the timing chain cover.

Verify that the timing marks on the camshaft timing gear assemblies and the marks on the camshaft timing sprockets are aligned with their corresponding marks on top of the front camshaft bearing caps.

Set the engine to TDC and remove the crankshaft pulley, ensuring to hold it securely while removing the bolts.