Toyota 13054-20020 CAMSHAFT Sub-Assembly

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Optionally, valve lifters and shims can be removed and stored separately during camshaft removal.

Before removing the camshaft, disconnect the battery's negative terminal and remove the valve cover. Confirming that the engine is at Top Dead Center (TDC) on the compression stroke is important to ensure proper camshaft alignment.

The exhaust camshaft is removed by positioning the knock pin, securing the sub-gear, and sequentially loosening and removing the bearing cap bolts. Care should be taken to follow these steps accurately.

Before initiating this procedure, acquire two 6 x 1.0 mm bolts measuring 16 to 20 mm in length, referred to as service bolts. Start by positioning the engine at Top Dead Center (TDC), then proceed to remove the valve covers, timing belt, and camshaft sprocket. The subsequent steps pertain to the removal of each of the four camshafts, with a focus on securing the exhaust camshaft sub-gear first, followed by the removal of the intake cam and the exhaust camshaft. Ensure that the cam timing marks on the drive and driven gears align properly; this involves aligning the dots on the intake and exhaust camshaft gears on the right cylinder head and matching a single dot on the left cylinder head. Secure the exhaust camshaft sub-gear with a service bolt to eliminate torsional spring force, and subsequently, carefully disassemble the intake and exhaust camshafts by loosening and removing the bearing caps in a specific sequence. Store the bearing caps meticulously to maintain order, and if necessary, remove valve lifters and shims for separate storage. For the exhaust camshaft gear disassembly, mount the camshaft in a vise, use a service bolt, and remove the sub-gear snap-ring to access the wave washer, sub-gear, and camshaft gear spring. When reassembling the exhaust camshaft gear, insert service bolts, align holes, and secure the gears together. Apply moly-base grease or engine assembly lube to the lifters, then reinstall them in their original locations along with the valve adjustment shims. Lubricate the camshafts and set the exhaust camshaft into place with the timing mark on the sub-gear positioned correctly. Apply RTV sealant to the outer edges of the front bearing cap-to-cylinder head mating surfaces and tighten the bearing cap bolts incrementally. Replace the camshaft oil seal and apply camshaft installation lubricant to the intake camshaft lobes, bearing journals, and gear thrust faces. Reinstall the intake camshaft, ensuring the timing marks align with the exhaust camshaft timing mark. Insert bearing caps and tighten their bolts incrementally before proceeding with the removal of the service bolt from the exhaust camshaft sub-gear. Finally, reinstall the timing belt rear cover, camshaft sprockets, and timing belt, followed by the remaining components, ensuring proper sealing and gasket maintenance, then run the engine and inspect for leaks and functionality.