Toyota 13523-31030 Gear Or Sprocket, Camshaft Timing

The timing system is rather complicated and if the mistakes are made during this kind of operation, severe engine damage may take place therefore if possible, it is recommended to consult with an expert or the person who has a considerable experience only. Start with disconnecting the negative terminal on the battery, next draining the engine oil and coolant, also remove the battery, engine cover, air filter housing, radiator, cooling fan, serpentine drivebelt, upper intake manifold, ignition coils, valve covers, Variable Valve Timing sensor, dipstick and tube, power steering pump though without removing the hoses powers the alternator, next get rid of the air conditioning compressor, drivebelt tensioner, id Remove both the radiator hoses as well as all the water bypass hoses, pop out the water inlet as well as its O-ring and gasket. Pulling off the timing chain cover and count the numbers of the fasteners and avoid prying in improper places which can harm the component. In brief, perform step B: Turn the No.1 cylinder to TDC on the compression stroke, lock the tensioner in place, and than, remove the chain tensioner slipper, idler sprocket shaft, and chain vibration dampers. Detach the No. 1 timing chain and crankshaft timing chain sprocket and compress and lock the chain tensioner No. 2 and then remove the sprockets and chains as they come as assemblies and also store them. Examine all components for wear signs and damage, quantify the degrees of timing chain elongation, and measure the sprocket diameter; also, check the oil clearance at the idler sprocket and the functionality of all the chain tensioners. For assembly, turn the crankshaft to the right position, lock the tensioners, fit timing chains that the marks align properly and tighten all the bolts to the required torque. After all the timing marks are set properly, rotate the crankshaft to make sure the chains are tensioned correctly, remove the old RTV sealant, then install a new crankshaft oil seal and O-ring, apply the gray RTV sealant properly on the timing chain cover, and put the cover back in its correct position. All fasteners must be tightened gradually and evenly; usually, it is required to install the bolts in the oil pan last of all, but do it in the reverse order of their removal. Last but not the least, add fresh automobile oil and coolant and join the battery then start the engine to find leakage.

The timing system requires special attention, and there will be significant damage to the engine if the process is mishandled; thus, it is only recommendable that only experienced personnel work on it and seek advice from a specialist if there is a doubt. Start with the removal of the negative terminal of the battery and then the subsequent drainage of the engine oil and the coolant. Clear the battery, engine lid, air filter housing, cooling lovers, front radiator, drive belt, intake manifold, spark plugs, and valve covers. Remove the Variable Valve Timing sensor connector bolts and pull the connector aside, pull out the dipstick and its tube, and disconnect the power steering pressure switch, while unbolt the power steering pump though the hoses remain connected. Lift the alternator and air conditioning compressor out of the car while maintaining the connection between the refrigerant hoses, next unscrew the drivebelt tensioner, and take off the idler pulleys and crankshaft pulley. Loosen and unscrew the timing cover bolts, the water inlet, and the timing chain cover while trying to note the position of the bolts. With the piston at TDC in cylinder No. 1 and on the compression stroke, the tensioner locked, take off the chain tensioner slipper, idler sprocket shaft, and the No. 1 timing chain Only. When carrying the crankshaft, do not rotate it when the No. 1 timing chain is absent, then proceed to the removal of the crankshaft timing chain sprocket and the compression of the chain tensioner No. 2. Take out the bolts by unscrewing what secures the camshaft timing sprockets, and take off the sprockets and the chain as one unit; ensure that the unit is stored correctly. Follow the process again for the No. 3 timing chain and tensioner making sure not to rotate the Crankshaft during this process of removing. Look for wear or damage at all of the bearings, both the link-cog and fatigue-shaft; determine the amount of stretch in the timing chain; look at both sprocket diameters and oil clearances. Check the performance of the chain tensioners and fit the crankshaft pulley bolt; turn the crankshaft to the ideal position. Tighten the tensioner plungers, fit the timing chains in place and make sure that the small yellow mark links connect with the appropriate timing marks on the sprockets and final/secure the sprockets. Bolt in the chain guide, crankshaft timing sprocket and tensioner slipper and then ensure the positioning of the timing marks. Turn the crankshaft to check smooth running, scrape off existing RTV material, check/clean the new crankshaft oil seal and O-ring, and apply grey RTV sealant on timing chain cover and mating surfaces. Arguably, the installation of the timing chain cover should be done within the required time, appropriate tightenings of all the fasteners should be done systematically and uniformly while fixing the bolts for oil pan. The last steps are the reverse of the removal steps, with filling the engine with oil and coolant, connecting the battery, and starting the engine to look for signs of leakage.