It is very intricate to have a timing system; any slip-up will result in severe damage to the engine. Do not try this if one has little experience in this kind of repair work, seek professional help if required. Review all work and be certain all items are accurate before applying engine power. After the valve covers have been removed the magnetic timing wheels that lubricate the camshafts should not come in contact with any kind of magnet as this will enable the timing wheels to have to be replaced. Start with the presumptuousness of the cable or negative terminal of the battery followed by the removal of the drive belt, the engine oil and the coolant, the air filter housing and the resonator. Then, unbolt both intake and exhaust manifolds, then pull off all connectors and vacuum lines from the cylinder heads, being sure to mark them for reconnection, detach the ignition coils and spark plug connectors and finally, label the ignition coils before pulling them out. Take off the valve covers, cylinder heads and rocker arm shaft assembly, then put a wrench on the flats on the timing belt sprocket and take out the camshaft sprocket bolt, then shift the sprocket form the end of the camshaft, or you will mix up the camshaft sprockets. Take off camshaft thrust plate screws and the thrust plate from the cylinder head rear facade and, with great care, extract the camshaft from the cylinder head. Check the bearing journals on the camshaft for any rattle or movement and measure the camshaft lobe heights, both intake and exhaust, with a micrometer and record the results; if the difference of the measurements is more than 0.005 inches the camshaft should be replaced. Inspect the rocker arms and shafts to see if they have unusually high levels of wear and replace any of them which may have developed problems. Also, before turning the engine on, with the engine off, attempt to turn the crankshaft at least twice and if there is any form of resistance this should be addressed. Moisten the camshaft bearing journals and lobes with moly-base grease or engine assembly lube and then thread the camshaft in the cylinder head sensitively as not to mar the bearing surface. Replace the current thrust plate gasket with a new one and also the thrust plate by merely tightening bolts to the correct torque. Centre the mark on the crankshaft sprocket with that on the oil pump before fitting the camshaft sprockets onto the camshafts, aligning the sprockets' marks on the cylinder head and tightening the bolts to the stated torque. Lastly, fit the timing belt and the other parts that were removed starting from the last one and fixed in the initial stages.
