Camshafts should always be checked before being fitted and camshaft end play should also be checked before the removal of the same. Start by unhooking the wire from the negative terminal of the battery and as per models produced after the year 2007, it is necessary to remove the battery, and the side cover as well. Check whether the engine is exactly at TDC of the compression stroke by making crankshaft pulley and the camshaft sprocket timing marks to align. Take off the valve cover put paint on the timing belt/chain and sprockets for reassembly identification, and mark sprockets and belt on 2007 and earlier models. Do not allow the camshaft to rotate when loosening the sprocket bolts, and remove sprockets without disassembling the variable valve timing section. Check the camshaft endplay, lift off the front camshaft bearing caps according to the marking and store the caps in the same manner for replacement. The lash adjusters or lifters have to be removed, all the components should be examined for signs of wear and the end play on the camshaft needs to be measured using a dial indicator. Examine all the camshaft bearing surfaces and check the outside diameter of each camshaft bearing journal with the help of specification size. Check camshaft lobe height and ensure it does not have any runout with the aid of a dial indicator. Check hydraulic adjuster or lifters for wear, apply the required lubrication to the parts to be lubricated and position the camshaft using the dowel pins in the upward direction into the cylinder head. Loosening of the bearing cap bolts is the final operation is to torque the bearing cap bolts to specifications in sequence. If, on the camshaft side, the oil seal is damaged, replace it at this point of the operation. For models with production dates of and after December 31, 2010, it is necessary to check or alter the valve clearances if necessary. While doing this you have to ensure that the camshaft sprocket teeth are meshed with the timing belt and the upper timing marks are aligned and then fit in the camshaft position sensor. For adjustment of 2010 And later models, measure the clearance between the camshaft lobes and lifters with the engine rotated and if any of the clearances exceed the limit the camshaft and lifters must be removed a measure the thickness of the lifters, the new lifters must have to be reduced to the correct thickness before reinstallation and final check on the clearances.