Question 1

How to remove and inspect a camshaft on Four cylinder engine on 1997 through 2001 Toyota Avalon?

Accepted Answer

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.

Question 2

How to remove the camshaft on Four cylinder engine on 2002 through 2006 Toyota Avalon?

Accepted Answer

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.

Question 3

How to remove and install a camshaft on Four cylinder engine on 2007 through 2015 Toyota Avalon?

Accepted Answer

Prior to the camshaft removal, it's crucial to disconnect the negative battery terminal and remove the valve cover. Ensure the engine is at TDC for the number 1 cylinder and mark the timing chain links at the camshaft sprocket timing marks. Loosen the camshaft sprocket bolts while holding the camshafts, and then proceed to remove the timing chain tensioner, camshaft sprocket retainer bolts, and camshaft sprockets while being cautious of the Variable Valve Timing (VVT) actuator's position. In 2009 and earlier models, verify the markings on the camshaft bearing caps, followed by careful loosening and detachment of the caps to remove the camshaft(s). The lifters should also be removed and labeled accordingly. For 2010 and later models, a different process is involved, including the removal of the camshaft housing, rocker arms, and lash adjusters. After removal, thorough inspection of components, including camshafts, camshaft bearings, lifters, and more, is essential, along with measurements to ensure they meet specifications. During installation, apply camshaft installation lubricant to camshaft lobes and journals. In 2009 and earlier models, reinstall the camshafts, camshaft bearing caps, and timing chain with proper alignment, followed by tightening the camshaft sprocket bolts and installing the timing chain tensioner. For 2010 and later models, installation involves placing the lash adjusters, rocker arms, camshaft bearings, and camshaft housing back into position with precise torque sequences. Once camshaft housings are sealed, reinstall camshaft sprockets, timing chain, and timing chain cover. Finally, reassembly continues in the reverse order of removal, ensuring proper camshaft endplay, alignment, and other critical factors are checked before completing the procedure.

Question 4

How to remove and reinstall camshafts on V6 engine on 2002 through 2006 Toyota Avalon?

Accepted Answer

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.

Question 5

How to remove the Camshaft and Rocker Arm on V6 engine on 2007 through 2015 Toyota Avalon?

Accepted Answer

This procedure requires engine and transaxle removal. Drain engine oil and coolant, then remove timing chains and sprockets. Ensure correct camshaft positioning before removal. Gradually remove bearing cap bolts, then housing bolts. Remove bearing caps and camshafts, and pry off camshaft housing. Remove and inspect rocker arms and lash adjusters. Check cam lobes and bearing journals for damage. Measure camshaft lobe and journal dimensions, replacing any outside specified limits. Check oil clearance for each camshaft journal, replacing if necessary. Lubricate and reinstall lash adjuster bores, rocker arms, camshafts, bearing caps, and housing. Apply RTV silicone sealer to sealing surfaces and tighten bolts. Repeat for front cylinder bank. Reinstall timing chains, cover, and components. Check for resistance by hand-rotating crankshaft. Refill oil and coolant, reconnect battery, start engine, and check for leaks.

Question 6

How to remove and install camshafts on V6 engine on 1997 through 2001 Toyota Avalon?

Accepted Answer

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.

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