Disconnect the cable from the negative battery terminal. Remove the spark plugs, then take off the valve cover. Loosen the right front wheel lug nuts, raise the front of the vehicle, and support it securely on jackstands before removing the wheel. Remove the fender splash shield. Using a wrench or socket on the crankshaft pulley bolt, rotate the crankshaft clockwise and check each lifter when its
Camshaft lobe is straight up, ensuring that the measurement is between the base circle of the camshaft lobe and the top of the lifter. Use feeler gauges to measure the clearances, ensuring a slight drag is felt as the feeler gauge is slid between the lifter and the camshaft. The clearance must be checked between each camshaft lobe and the lifter it operates, and careful notes of the measurements recorded for each lifter should be kept. If some measurements fall outside the recommended clearances, the camshafts must be removed, and the out-of-spec lifters replaced. New lifters are available with various thicknesses to correct the valve clearances, each marked with a thickness number. To determine the desired thickness for new lifters, add the thickness of the original lifter to the measured clearance, then subtract the mid-range figure for ideal clearance to find the proper lifter thickness to order, keeping in mind that not every thickness is available. Install the camshafts, then recheck the valve clearances. The remainder of the installation is the reverse of removal; run the engine and check for oil leaks.