To check camshaft endplay, install the camshaft and secure it with the caps, then mount a dial indicator on the cylinder head with the pointer resting on the camshaft nose. Use a large screwdriver as a lever to move the camshaft forward and backward, noting the dial indicator reading, and compare it with the endplay specifications. If the reading is excessive, replace the worn parts. For camshaft runout, support the camshaft with V-blocks and set up a dial indicator against the center bearing journal, rotating the camshaft to note the indicated runout and comparing it to specifications; replace the camshaft if the runout exceeds limits. To remove the camshaft, take off the valve cover, set the engine at TDC for cylinder number one, and remove the timing belt and distributor. If necessary, separate the sprocket from the camshaft by removing the sprocket bolt while preventing the camshaft from turning. Remove the rocker arm assembly, numbering the camshaft bearing caps if they lack numbers, and lift out the camshaft, wiping it clean and removing the camshaft seal. Inspect the camshaft bearing journals and caps for scoring and wear, replacing the cylinder head if worn, and check oil clearance with Plastigage, replacing the camshaft if any journal is out of specification. Examine the cam lobes for wear, checking for score marks and uneven wear, and measure the cam lobe height with a micrometer, replacing the camshaft if wear is indicated. Inspect the rocker arms for wear and ensure proper lubrication to prevent future issues. For installation, clean all components thoroughly, lubricate the camshaft bearing surfaces and lobes with assembly lubricant, and carefully lower the camshaft into position, installing a new camshaft seal with the spring side facing in. Install the rocker arm assembly, rotate the camshaft as needed, and install the camshaft sprocket with the "UP" mark at the twelve o'clock position. Install the timing belt and related components, ensuring the crankshaft position is realigned if disturbed, then rotate the crankshaft counterclockwise through two complete revolutions to recheck alignment marks on the sprockets, adjusting as necessary. The remainder of the installation follows the reverse order of removal.
