To remove the Continuous Variable Valve Timing (CVVT) assembly on the camshafts, do not disassemble it; instead, remove the center bolt from the end of the camshaft. Begin by positioning the engine at TDC, then remove the valve covers,
Timing Chain or belt, and camshaft sprockets. Ensure the cam timing marks on the sprockets and engine are aligned. Remove the Oil Control Valve (OCV) mounting bolts and the valves from the front camshaft bearing caps, marking the camshafts clearly to avoid confusion. Loosen the camshaft bearing cap bolts in 1/4-turn increments in reverse order of tightening until they can be removed by hand, starting with the outer caps. The bearing caps are marked for intake and exhaust; store them in the correct order. If applicable, remove the valve hydraulic adjusters and rocker arms on earlier models, or the bucket-style lifters on later models, storing them separately. Apply camshaft installation lubricant to the camshaft lobes and bearing journals, then install the lifters or lash adjusters and rocker arms in their original positions. For later V6 engines, install the timing chains around the sprockets and ensure the timing marks are aligned. For earlier models, place each camshaft in its original position and verify the timing marks. Install the bearing caps in numerical order with arrows pointing toward the
Timing Belt end, and install a new camshaft oil seal if necessary. Reinstall remaining components in reverse order of removal, tightening the bearing cap bolts to the specified torque. Verify that all timing marks are aligned to prevent major engine damage, then run the engine and check for leaks and proper operation. For valve clearance adjustment on later V6 engines, remove the valve cover and set the number one cylinder to TDC on the compression stroke. Measure the clearance between the camshaft lobes and lifters using a feeler gauge, noting the figures. Rotate the engine one turn clockwise and repeat the procedure for the remaining valves. If clearances are outside limits, remove the camshaft(s) and lifter from the incorrect location, measure its thickness, and calculate the correct thickness for a new lifter. Purchase and install replacement lifters, then check clearances again to ensure they are within specification. Apply camshaft installation lubricant, install the lash adjusters, place each camshaft in its original position, verify timing marks, and install the bearing caps in numerical order, tightening the bolts in sequence.