Toyota 13054-20010 CAMSHAFT Sub-Assembly

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Ensure you have two 6 x 1.0 mm bolts. Start by aligning the engine at TDC and removing the valve covers timing belt, and camshaft sprocket. Remove the intake cam and exhaust camshaft for each head, and align cam timing marks. Repeat for the exhaust camshaft. For exhaust camshaft gear disassembly, mount the camshaft in a vise, rotate the sub-gear, and remove the first service bolt. Remove the sub-gear snap-ring, wave washer, sub-gear, and camshaft gear spring. For installation, reassemble the exhaust camshaft gears, align the holes of the gears, and install a service bolt. Apply grease to the lifters, install them in the cylinder heads, and apply lubricant to exhaust camshaft lobes, bearing journals, and gear thrust faces. Install bearing caps and a new camshaft oil seal. Repeat for the other cylinder head. Remove the service bolt, and reinstall the camshaft sprockets and the timing belt.

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.

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

The key steps involve removing each of the four camshafts. First, secure the exhaust camshaft sub-gear. Then, disassemble the intake and exhaust camshafts by loosening and removing the bearing caps in a specific sequence.

The remainder of installation is the reverse of removal, including installing the timing chains and the timing chain cover.

Apply camshaft installation lubricant to the exhaust camshaft lobes, bearing journals, and gear thrust faces.

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.

Final steps include reassembling the exhaust camshaft gear, aligning timing marks, securing bearing caps, and installing the timing belt and remaining components. Proper alignment of timing marks is crucial to maintain engine timing and performance.