Toyota 13054-20010 CAMSHAFT Sub-Assembly

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Before proceeding, ensure you have two 6 x 1.0 mm bolts measuring 16 to 20 mm in length, referred to as service bolts hereafter. To initiate the removal process, align the engine at TDC and remove the valve covers, timing belt, and camshaft sprocket. The subsequent steps pertain to each of the four camshafts. Begin by securing the exhaust camshaft sub-gear, followed by the removal of the intake cam and then the exhaust camshaft for each head. Ensure alignment of cam timing marks on the drive and driven gears. For the right (rear) cylinder head, align the two dots on the intake camshaft gear with those on the exhaust camshaft gear. For the left (front) cylinder head, align the one dot on the intake camshaft gear with the one dot on the exhaust camshaft gear. Secure the exhaust camshaft sub-gear to the driven gear with a service bolt in the threaded hole. Gradually loosen intake camshaft bearing cap bolts in 1/4-turn increments until hand-removable, following the reverse of the recommended tightening sequence. Remove bearing caps and gently lift out the intake camshaft. Repeat the process for the exhaust camshaft. Ensure proper storage of bearing caps. Optionally, valve lifters and shims can be removed and stored separately. For exhaust camshaft gear disassembly, mount the camshaft in a vise with jaws gripping the large hex on the shaft. Insert a second service bolt in the unthreaded hole in the camshaft sub-gear, rotate the sub-gear clockwise using a screwdriver against the service bolt, and remove the first service bolt. Eliminate the second bolt if using a two-pin spanner. Remove the sub-gear snap-ring. Proceed to remove the wave washer, sub-gear, and camshaft gear spring from the camshaft, keeping rear and front cylinder head parts separated. For installation, reassemble exhaust camshaft gears by fitting the camshaft gear spring, sub-gear, wave washer, and snap-ring. Mount the camshaft in a padded vise, insert a service bolt into the unthreaded hole in the camshaft sub-gear, align the holes of the camshaft driven gear and sub-gear by turning the camshaft sub-gear clockwise, and install a second service bolt in the threaded hole, tightening to secure the gears. Remove the service bolt from the unthreaded hole. Apply moly-base grease or engine assembly lube to the lifters, install them in their original locations in the cylinder heads, ensuring valve adjustment shims are in place. Apply camshaft installation lubricant to exhaust camshaft lobes, bearing journals, and gear thrust faces. Set the exhaust camshaft in place in the cylinder head with the timing mark on the sub-gear facing the center of the head. On the right (rear) cylinder head, align the two dots on the intake camshaft gear with the two dots on the exhaust camshaft gear, and on the left (front) cylinder head, align the one dot on the intake camshaft gear with the one dot on the exhaust camshaft gear. Install bearing caps with arrows pointing toward the timing belt end of the engine and tighten bolts following the recommended sequence. Install a new camshaft oil seal. Repeat this process for the other cylinder head. Remove the service bolt from the exhaust camshaft sub-gear and reinstall camshaft sprockets and the timing belt. Reinstall the remaining components in reverse order, including applying RTV sealant before reinstalling valve covers and cleaning rubber half-circle plugs for the back of the heads, reinstalling them with new RTV sealant. Finally, run the engine, check for leaks and proper operation.

To remove the camshaft, start by disconnecting the cable from the negative terminal of the battery. Then, remove the valve cover and visually confirm that the engine is at TDC on the compression stroke. Apply a dab of paint to the timing chain links where they meet the upper timing marks on the camshaft sprockets. Loosen the camshaft sprocket bolts and remove the timing chain tensioner and camshaft position sensor. Remove the camshaft sprocket retaining bolts and disengage the timing chain from the sprockets. Hang the timing chain up with a piece of wire and place a rag in the timing chain cover opening to prevent foreign objects from falling into the engine. Verify the markings on the camshaft bearing caps and loosen the caps in the reverse order of the tightening sequence. Detach the bearing caps and remove the camshaft(s) from the cylinder head. Remove the lifters from the cylinder head, keeping them in order with their respective valve and cylinder. Inspect the camshafts, camshaft bearings, and lifters for wear or damage. Before removing the camshafts from the engine, check the camshaft endplay and inspect the camshaft bearing surfaces in the cylinder head for damage. Measure the outside diameter of each camshaft bearing journal and record your measurements. Measure the height of each camshaft lobe and check the camshaft runout. Inspect each lifter for wear and measure the outside diameter of each lifter and the corresponding lifter bore inside diameter. If necessary, install new No.1 journal bearings for the intake camshaft. Apply engine assembly lubricant to the camshaft lobes and journals and install the camshaft into the cylinder head. Install the bearing caps and bolts and tighten them in the proper sequence. Engage the camshaft sprocket teeth with the timing chain links and position the sprockets over the dowels on the camshaft hubs. Install the camshaft sprocket bolts and tighten them. Install the timing chain tensioner and complete the 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.

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.

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.