The rockeraear machined is part of the camshaft carrying plates, and both rockerarms are consisted of, and clamped to, rockerarms attached to distinct rocker shafts that snap into place on the bearing caps. There is one exhaust and one inlet rocker arm on a bearing cap assembly and hydraulic valve lifters mounted on the rocker arms are supplied with oil by drillings on the rocker arms. The air cleaner assembly and camshaft sprocket should be removed, securing bolts should then be unscrewed to pull off the oil spray pipe located in the camshaft bearing caps. Rocker arm identification marks and bearing caps are to be inspected, and where missing, appropriate marks obtained. The camshaft bearing capbolts can be unscrewed in a diagonal sequence gradually, and then the camshaft bearing cap/rocker assemblies are able to be lifted. The valve lifter contact pads should be taken off in sequence, and the camshaft is now lifted out of the cylinder head. When dismantling, the camshaft bearings and lobes must be checked as to their condition, and, where needed, at the same time renew the camshaft and all the rocker arms. By drawing out the short rocker shafts the rocker arms can be taken out and the shafts must be marked to be reassembled. The mandrel may be used to remove the valve lifters, and spacer washers must also be stored in order. It is possible to check the functioning of the valve lifters by pouring the oil into them and observing whether it performs correctly or not, it case the whole mechanism and constructions should be replaced. There are different thicknesses of spacer washers to ensure appropriate clearance, and when overextended wear takes place, another thickness could be needed. Fitting the valve lifters with assembled rocker arms is also recommendable so that as little time as possible get wasted in assembling the valve lifters, wasting oil as well. All value lifters should be filled with oil and then the spacer washer and a life lifter should be inserted into the rocks arm housing. When refitting, the endfloat control thrustwasher must be set correctly, and the camshaft then lubricated and fitted into position with the TDC pin or hole facing upward. The individual valve lifter contact pads are to be remounted on existing valve stems, and the bearing caps mounted on the camshaft faces to be remounted in their original locations and, then, tightened in a diagonal fashion to the recommended torque. The oil spray access pipe must be examined to show any damage is present, and both the crankshaft and camshaft timing marks must be checked before re-connecting the camshaft sprocket and air cleaner assembly.