Toyota 13080-31030 Gear Assy, Camshaft Timing Exhaust, LH

From models manufactured in 2001, Variable Valve Timing (VVT) is incorporated in the assembly, with the control valve being affiliated to the oil system, the oil filter, or the intake camshaft sprocket/actuator of either cylinder head. The VVT system controls intake camshaft position by regulating the pressure of oil to improve torque, fuel consumption, exhaust emission. Part include PCM; the Oil control valves (OCVs); the oil filters; the intake camshaft sprocket/actuator. The PCM expends signal data from different sensors to regulate the OCV, which disseminates oil pressure to modify the position of the camshaft. Within the sprocket/actuator assembly, there is an internal hub with set vanes which is rotated with the help of oil pressure for the adjustment of up to 21°. In different loads of the engine, the system changes the camshaft timing to increase performance and more efficiency. Problems in the VVT system arise from the OCVs and filters requiring service often. Occasionally, certain OCV filters become clogged which can cause issues, that means the filter needs to be checked and preferably cleaned. It is necessary to check the OCV, for doing this you must measure the resistance across its terminals; if the value is out of the range it should be replaced. For replacement, unplug the electrical connector, and unscrew the hold-down bolt in addition to installing a new O-ring. The camshaft sprocket/actuator assembly thus needs to be well handled, s accepting that it must remain locked at idle conditions. Relatively, the advance side oil port if cleaned and subjected to air pressure, the actuator should move freely; if it fails to do so, replacement is mandatory. In case of replacing the assembly, make sure that the lock pin is aligned to the groove, lubricate the seating plane to the assembly, and use a new retaining nut which is retailed to be turned in the opposite direction. Last but not the least, replace back the intake camshaft, timing belt and finally the valve cover.

The timing system is slightly involved and drastic engine damage could result in the case of a misunderstanding, this should only be carried out by experienced personnel in consultation with the mechanic in case of difficulties. Start with live electromagnetic termination of the negative companion terminal, eliminating fuel pressure and removing fuel hoses. Before proceeding with the work, you must drain the engine oil and coolant, disconnect the engine cover, the fan shroud and the radiator, the inlet duct and the housing of the air filter. Most connections are disconnected electrically; the intake manifold, heater hoses, thermostat housing, water pump, and the A/C compressor are some of the parts, which can be pulled out of the way only in some cases. Put off the oil filter, the dipstick tube, power-steering pump, the alternator, the fan bracket assembly, the ignition coils, spark plugs, and both the valve covers. Leave the engine to remain on TDC, aside from that, loosen the crankshaft pulley and take the timing chain cover off without scratching the cover. Remove the old crankshaft seal and as far as the piston in No. 1 cylinder is nearing the TDC on the compression stroke to check the crankshaft and camshaft timing marks on the sprockets. Fasten the No.1 tensioner with the retracted position, take out the chain vibration dampers and notice the timing marks before taking off the No. 1 timing chain and crankshaft timing chain sprocket. Tighten the No. 2 chain tensioner and shut the lock, then remove the camshaft timing sprockets and No. 2 tensioner and put the components in anOne of the sealed transparent plastic bags. Do the same for the No. 3 timing chain as well as the timing chain tensioner; however, do not rotate crankshaft during removal. Check all timing chain assembly components for signs of wear and or damage, and check the length of the chain as well as the diameter of the sprockets and the tensioners. To check it, you should grab the crankshaft when the starter is not engaged and try to rotate it; there should be some level of resistance. Timings for the No.2 timing chain is to position the yellow mark links with the timing lines and finally bolt the sprockets onto the cams. Unbolt No. 1 chain cover, and put the long timing chain in position, with orange links engaging timing dots and then bolt the No. 1 tensioner. Scrape off the earlier applied RTV sealant from the mating surfaces, replace the crankshaft oil seal and O-ring, apply gray RTV sealant to the O-ring and finally place the timing chain cover and fasteners while tightening them in the correct manner. reverse all the procedures mentioned under removal, replace the oil and the coolant, join the battery terminals, and start the engine to search for any fluid leakage.

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.

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.

Remove the drive belts from the alternator and power steering pump.

Inspect all parts for wear and damage, including the timing chain, sprockets, and chain guides.