Toyota 13054-20020 CAMSHAFT Sub-Assembly

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Get two 6 x 1.0 mm bolts before starting. Position the engine at Top Dead Center (TDC) and remove valve covers, timing belt, and camshaft sprocket. Take out the four camshafts, starting with the exhaust camshaft sub-gear, then intake and exhaust camshaft. Align cam timing marks on gears. Secure exhaust camshaft sub-gear with a bolt and disassemble camshafts by removing bearing caps. Store caps and valve lifters separately if needed. For exhaust camshaft gear disassembly, mount camshaft in a vise, use a bolt, and remove snap-ring. Reassemble exhaust camshaft gear, lubricate lifters and camshafts, and set exhaust camshaft. Apply RTV sealant to front bearing cap-to-cylinder head surfaces and tighten bolts. Replace camshaft oil seal and lubricate intake camshaft. Reinstall intake camshaft, align timing marks. Insert bearing caps and tighten bolts before removing bolt from exhaust camshaft sub-gear. Reinstall timing belt rear cover, camshaft sprockets, and timing belt. Finally, run engine and check for leaks and functionality.

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.

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

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.

Verify that the timing marks are aligned on the camshaft sprockets.

Loosen the intake 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 bearing caps and gently lift out the intake camshaft, keeping it level.

The caps should be marked from 1 to 5 with an "I" or "E" indicating whether they're for the intake or exhaust camshaft.

Using a micrometer, measure the height of each camshaft lobe and compare it with the specified allowable minimum.

Position the engine at TDC, then remove the valve covers, the timing belt, and the camshaft sprocket. Measure the camshaft thrust clearance with a dial indicator. If the clearance exceeds the service limit, replace the camshaft or the cylinder head.