Toyota 13502-20020 CAMSHAFT

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Disconnect the battery cable, remove the valve cover, and set the engine at TDC on compression stroke. Mark timing chain links at camshaft sprockets, loosen sprocket bolts and remove the timing chain tensioner and camshaft sensor. Remove the sprocket bolts, disengage the timing chain, and hang it. Loosen camshaft bearing caps in reverse order and remove camshaft(s). Inspect lifters, camshafts, and bearings for wear. Check camshaft endplay, measure bearing journal, and camshaft lobe diameters. Engage sprocket teeth with the timing chain, and install sprocket bolts and timing chain tensioner. Complete installation in reverse order.

For the removal procedure it is suggested that the engine and transaxle assembly must be removed. This is not a task for the novices so it is recommended to read the entire procedure before attempting it. The process of this work includes, for example, the removal of the engine oil and the engine coolant in the first step and subsequent removal of the timing chains or-more precisely-the timing sprockets. To access Intake cam lobe for No.1 cylinder: align the pointer to the 12 O'clock position- for the exhaust cam lobe align pointer to 3 O'clock Before removing the bearing cap bolts and housing bolts, these must be loosened in a sequence that is quite the reverse of the tightening order. Bolt and nut the camshafts and keep all the parts collectively. For 2GR-FKS engines, make sure the marks are in TDC position and then remove the camshaft timing gear bolts to remove the sprockets. Before releasing the bearing caps clear the intake camshaft locating pins, and to release the bolts do so in sequence starting with the last. Insert a spanner under the camshaft housing and pull it off the cylinder head while unbending the rocker arms and the lash adjusters and make sure they are placed in order. Check every rocker and lash adjuster for signs of wear, look closely at the cams for any possible damage to the cam lobes and the bearing journals, and determine the height of each of the camshaft's lobe and the diameter of the every journal. Use Plastigage to check the oil clearance of every camshaft journal and; if the measurement is not within the required limits, then the camshaft has to be replaced. For installation, lubricate the lash adjuster bores and the adjusters and position them with the original position of the rocker arms. The camshaft journals and lobes should be lubricated and the camshafts should be installed, the mating surfaces of the camshaft housing assembly should be coated with RTV silicone sealer before the camshaft housing is installed. After that, turn all bolts marked on the assembly with tightness to one another in the prescribed order to the required torque. The remaining steps of the installation process go in the reverse order of the removal, and one has to make sure to rotate the crankshaft to feel for any resistance after; the engine is refueled with oil and coolant; the battery is reconnected and the engine is started to see if there are any signs of leakage.

Before starting, you need to acquire two service bolts. Then, position the engine at Top Dead Center (TDC). After that, proceed to remove the valve covers, timing belt, and camshaft sprocket.

The timing belt, camshaft sprocket, and upper rear belt cover are removed to access and inspect the camshaft and related components.

Before starting the camshaft removal process, you should have two 6 x 1.0 mm bolts measuring 16 to 20 mm in length, referred to as service bolts.

Inspect the camshafts, camshaft bearings, camshaft housing, rockers, and lash adjusters for wear.

Loosen the exhaust camshaft bearing cap bolts in 1/4-turn increments until they can be removed by hand, starting with the outer caps and working inward. Then, remove the exhaust camshaft bearing caps and oil seal, and gently lift out the exhaust camshaft, keeping it level.

One way to keep track is to put them in a box and label the cap numbers with a utility marker pen.

Mount the cam in a vise, insert a service bolt into the unthreaded hole in the camshaft sub-gear, and rotate the sub-gear clockwise to remove the first service bolt.