Question 1

How to remove and inspect a camshaft on Four cylinder engine on Lexus ES300?

Accepted Answer

Before initiating the removal process, ensure you have two 6 x 1.0 mm service bolts (16 to 20 mm long) at hand. To begin, remove the valve cover and the distributor. Proceed to remove the timing belt, camshaft sprocket, and upper rear belt cover. Measure the camshaft thrust clearance (endplay) using a dial indicator, and if it exceeds the service limit, replace the camshaft or cylinder head. For the exhaust camshaft, position the knock pin in the INTAKE camshaft at 10 to 45 degrees left of vertical, securing the exhaust camshaft sub-gear to the main gear with one service bolt before removing the rear exhaust camshaft bearing cap bolts and caps. Loosen and remove the exhaust camshaft bearing cap bolts sequentially and then remove the camshaft. For the intake camshaft, place the knock pin at 80 to 115 degrees left of vertical, remove the front intake camshaft bearing cap bolts, and lift off the caps and oil seal. Loosen and remove the intake camshaft bearing cap bolts sequentially and then remove the camshaft. To disassemble the exhaust camshaft gear, mount it in a vise and install a second service bolt in the unthreaded hole to secure the sub-gear. Rotate the sub-gear clockwise and remove the first service bolt, followed by the snap-ring, wave washer, sub-gear, and camshaft gear spring. Inspection involves measuring the camshaft gear spring's end gap, checking valve lifters and shims, inspecting each lifter for wear, measuring lifter bore oil clearance, examining cam lobes and journals for damage, and checking journal oil clearance. To measure journal oil clearance, clean the bearing caps and journals, lay Plastigage on each journal, install the caps, tighten the bolts in increments, and compare the crushed Plastigage width to specifications. If clearance exceeds the limit, replace the camshaft or cylinder head. For reinstallation, apply moly-base grease or assembly lube to lifters, camshaft lobes, and journals. Follow specific positioning instructions for the intake and exhaust camshafts, apply RTV sealant as needed, secure bearing caps, and install a new camshaft oil seal for the intake camshaft. Reassemble the exhaust camshaft gear, align the camshaft gears' timing marks, install the bearing caps, tighten bolts in increments, and remove the service bolt from the camshaft gear. Complete the process by installing the timing belt pulley, timing belt, and the remaining components in reverse order.

Question 2

How to remove and install camshafts in Four cylinder engine on Lexus RX330?

Accepted Answer

During these years' repairs, always check the camshaft condition first before installing, and measure camshaft movement before removing it from service. Make sure to disconnect the cable from the negative battery terminal, and next take off the valve cover. Pin your engine down at TDC on its compression stroke, number 1 cylinder running. Add a spot of paint where the timing chain meets timing marks on the camshaft sprockets. Before taking out the camshaft sprocket bolts, use a wrench to keep the camshafts from turning. Loosen each bolt a few turns with the wrench. Take off the timing chain tensioner from its housing at the cover and the camshaft position sensor from the head of the cylinder. Loosen the timing chain cover opening to remove the camshaft sprocket retaining bolts. Then, slide off the timing chain from each sprocket and take out the camshaft sprockets from the engine block. Be sure to secure the timing chain while it hangs away from the engine and cover the opening with a rag to stop debris from entering. To disconnect the camshafts, loosen their bearing caps in a specific order, move the caps off the head, tag the camshafts "Intake" or "Exhaust" to keep them from mix-ups. When you take off each lifter from the cylinder head, put it back with its matching valve and cylinder, and check the camshafts, camshaft bearings, and lifters for any sign of deterioration. Use a dial indicator to check camshaft endplay before you take out the camshafts. Look closely for harm to the camshaft bearing locations in the cylinder head. Comparison of camshaft bearing journal diameters against factory specifications. Check the camshaft lobe length and how true the camshaft runs on its axis. Look for wear on the lifters and get their outer size to figure the amount of oil they allow through. During installation, slide the No.1 journal bearings back into the cylinder head, then apply lubricant to both the camshaft's lobes and journals before putting the camshaft back. Since the bolts connecting the bearing caps won't use tools to secure them when they're first tightened, be sure to do so by hand and start by tightening them uniformly. Fit the timing chain teeth into the camshaft sprocket, making sure each mark on the chain points to the correct spot on the camshaft, then verify that all timing sprockets are seated properly before tightening the camshaft sprocket bolts. Swing the timing chain tensioner in place, lubricate the valve adjusters, and put them into their slots on top of the engine block. Put oil onto the rocker arms before attaching them, making sure each one sits directly on its matching lash adjuster. Screw the camshaft bearings and oil control valve filter into the camshaft housing, then put the camshaft into its place within the housing and tighten the bearing cap screws. With the rocker arms in place, make sure the dowel pins point up when you install them, and put a bead of seal packing along where the camshaft housing contacts the cylinder head. Put the camshaft housing on to the cylinder head and fasten these bolts. Do not lubricate or start the engine for four hours after assembly. Install the sprockets on the camshaft, put the timing chain and timing chain cover back in place, and undo what was taken apart when you removed the camshaft.

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