Toyota 13053-20010 CAMSHAFT Sub-Assembly

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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.

First, verify the markings on the camshaft bearing caps. Then, loosen the caps in the reverse order of the tightening sequence, detach them, and remove the camshaft(s) from the cylinder head.

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.

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.

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 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.